RECOLONISATION PROCESS IN ABANDONED
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- Wanda Kujawa
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1 ISSN ISSN (online) Acta Sci. Pol. Agricultura, 14(1) 2015, RECOLONISATION PROCESS IN ABANDONED Molinietum caeruleae MEADOWS THE INFLUENCE OF POSITION WITHIN GAPS ON MICROSITE CONDITIONS AND SEEDLING RECRUITMENT Kinga Kostrakiewicz-Gierałt Jagiellonian University 1 in Krakow Abstract. Investigations were carried out in patches of Molinietum caeruleae meadows dominated by small meadow species (patch I), characterised by prevailing large-tussock grasses (patch II), and overgrown by willow shrubs and bordered by trees (patch III). In each patch, 15 circular gaps with a radius measuring 30 cm were artificially created by the removal of the plant canopy and litter layer. Subsequently, each gap was divided into a central part, with a radius of 20 cm, and a peripheral part. Light intensity and soil temperature were greater in the central parts of these openings than in their peripheries, while ground humidity presented the inverse tendency. Despite heterogenous environmental conditions in the gaps, the total numbers of species/seedlings noted in their central and peripheral parts did not differ significantly. The majority of taxa recruited similarly over the entire surface of openings; a much lower number of species colonized primarily the central parts of gaps; the lowest number of taxa appeared at the edges of openings. In the light of these investigations, it may be assumed that heterogenous microsite conditions in openings enable the recruitment of taxa with various germination requirements and contribute to the maintenance of species diversity. Key words: blue moor-grass meadow, light intensity, seedling recruitment, soil humidity, soil temperature, species diversity INTRODUCTION Meadows from Molinion alliance which are among the most species-rich meadows in Europe, have been suffering from a marked decrease in area since the 1970s [see Fuller 1987, Green 1990, Prach 1993, Muller 2000]. As a result they are included Corresponding author: dr Kinga Kostrakiewicz-Gierałt, Department of Plant Ecology of Jagiellonian University in Krakow, Lubicz 46, Kraków, kinga.kostrakiewicz@uj.edu.pl Copyright by Wydawnictwa Uczelniane Uniwersytetu Technologiczno-Przyrodniczego w Bydgoszczy, Bydgoszcz 2015
2 34 K. Kostrakiewicz-Gierałt among the most threatened habitats [Denisiuk 1991], have been designated for conservation by International Conventions [Council Directives 92/43/EC and 97/62/EC], and have been included in the NATURA 2000 network [Anonymous 2003]. A large body of literature has documented that a very promising method for the active protection of Molinia meadows is the creation of disturbances in the plant canopy and litter layer. This treatment leads to the appearance of gaps in the vegetation cover and necromass which are considered safe sites for seedling recruitment. Hitherto, the process of seedling germination in various type of openings has been investigated in the greenhouse with soil samples [Hölzel and Otte 2003a, b, Weiterová 2008, Schmiede et al. 2012]. Moreover, some authors [Křenová and Lepš 1996, Kotorová and Lepš 1999, Isselstein et al. 2002, Overbeck et al. 2003, Poschold and Biewer 2005, Vitová and Lepš 2011] have focused on the process of seedling recruitment following artificial seed introduction into gap areas, whereas other researchers have studied spontaneous gap colonisation in relation to the particulars of gap origins [Špačkova et al. 1998, Lepš 1999, Špačkova and Lepš 2004, Janeček and Lepš 2005, Kostrakiewicz-Gierałt 2012, 2013a, Fibich et al. 2013, Lepš 2014], the time frame of the creation of gaps [Kostrakiewicz-Gierałt 2015] and the size of gaps [Kostrakiewicz-Gierałt 2014]. Despite growing interest in the colonisation of gaps in Molinietum caeruleae patches, the current state of knowledge is still insufficient. Accordingly, the present investigations were carried out. The focus of the main objective was on studies of the recruitment process in the central and peripheral parts of openings. The specific aims were the assessment of: (1) light intensity, as well as soil temperature and humidity; (2) the total number of species and seedlings; (3) the number of seedlings of particular taxa in the centre and at the edge of gaps. My hypotheses were: (1) that microsite conditions differ between the central and peripheral parts of gaps; (2) that the total numbers of species (seedlings) in the central and peripheral parts of openings are different; (3) that in the seedling pool different species present different patterns of gap colonisation (dominating in the central part, prevailing in the peripheral part, or appearing over the entire surface of openings equally). MATERIAL AND METHODS The field trial The study area is located in the Kostrze district located on the western border of Cracow, south of the Vistula River (southern Poland). It is situated on the low flood terrace of the Vistula at a height of m. The groundwater level is 0.2 m below the surface of the ground. The soils in the Vistula River valley, consisting mostly of black earth and light clay, are covered by Molinia meadows. The abandonment of traditional land use over at least the past dozen years has favoured the development of Phragmites swamps and willow brushwood, leading to the fragmentation of meadows [Dubiel 1991, 1996]. The studies were carried out in three adjacent abandoned patches of Molinietum caeruleae with various species compositions. Patch I was characterised by prevailing meadow species creating delicate, procumbent stems or small tussocks. Patch II was dominated by large-tussock grasses. Patch III was overgrown by willow shrubs and bordered by trees. In 2012, the average height of vascular plants was evaluated on the basis of measurements of 30 randomly chosen stems of different species, performed Acta Sci. Pol.
3 Recolonisation process using a folding tape measure. Statistical analysis, performed using the Kruskal-Wallis H test, showed that the study sites differed significantly in terms of the height of the vascular plant cover. Site conditions in individual patches are described in Table 1. Table 1. The site conditions in studied patches of Molinietum caeruleae in 2012: I patch dominated by small meadow species, II patch with prevail of large tussocks grasses, III patch overgrown by shrub-willows and bordered by trees Tabela 1. Warunki siedliskowe w badanych płatach Molinietum caeruleae w roku 2012: I płat zdominowany przez niewielkie gatunki łąkowe, II płat z przewagą wysokokępowych traw, III płat zarośnięty przez krzewiaste gatunki wierzb i otoczony drzewami Patch I II III The patch area, m 2 Powierzchnia płatu The number of species in patch Liczba gatunków w płacie The dominants (species, with cover exceeding 20%) Dominanci (gatunki, których pokrycie przekracza 20%) The subdominants (species, with cover level ranging 5-20%) Subdominanci (gatunki których pokrycie waha się od 5-20%) The mean vascular plant height, cm Średnia wysokość roślin naczyniowych Lathyrus pratensis Lotus corniculatus Dianthus superbus Lychnis flos-cuculi Centaurea jacea Potentilla erecta Molinia caerulea Deschampsia caespitosa Phragmites australis Poa trivialis Galium boreale Salix repens ssp. rosmarinifolia Betula pendula Populus tremula Lysimachia vulgaris the value of statistical significance of differences (the H Kruskal-Wallis test, df = 2) among patches in vascular plant height achieved (p < 0.001) poziom istotności statystycznej różnic w wysokości roślin naczyniowych (test H Kruskala-Wallis a, df = 2) pomiędzy płatami wynosi (p < 0.001) In each patch, 15 circular gaps, with a radius measuring 30 cm, were randomly created on 15 April The gaps were created through the removal of the plant canopy and necromass, since, according to Kostrakiewicz [2011], this treatment produces the best results. The gaps were separated by belts of untouched vegetation at least 3.0 m wide, located ca 2.0 m from the border of the patch. Each gap was divided into a central part with a radius of 20 cm (thus covering an area of 1256 cm 2 ) and a peripheral part (covering an area of 1570 cm 2 ). Ramets of neighbouring clonal plants ingrown into the surface of gaps during the entire study period were not removed. The experimental design is shown in Fig. 1. The microenvironmental conditions in the centre and the peripheral parts of each opening (on the northern side of the gap s edge) were monitored once a week from 24 April to 6 November 2012 and from 9 April 2013 to 19 November All measurements were taken between 10 and 12 a.m. Light intensity at the soil level was examined with a Voltcraft MS-1300 digital photometer (accuracy ± 5% + 10 digits; measuring range ,000 lx). Humidity at the ground level was measured using an OMEGA HSM50 handheld digital soil moisture sensor (accuracy ± 5% + 5 digits; measuring range 0% to 50% moisture content in soil). Soil temperature at the depth of 5 cm was measured using a HANNA Instruments electronic temperature sensor (accuracy ± 0.1 C; measuring range 10ºC to +60ºC). Agricultura 14(1) 2015
4 36 K. Kostrakiewicz-Gierałt The process of gap colonisation was monitored at weekly intervals from 24 April to 12 November 2012 and from 9 April to 19 November Seedlings and juvenile individuals were removed and examined, according to the method proposed by Csapodý [1968] and Muller [1978], with the support of the author s comparative collection. The nomenclature of taxa follows Mirek et al. [2002]. The colonisation of the central and the peripheral parts of gaps were characterized by mean cumulative number of species and seedlings, calculated by adding species (seedlings) that appeared over the course of two years. Subsequently, absolute values were recalculated based on the relative numbers of species (seedlings) which might appear in an area of 1 m 2. The recruitment rates of particular taxa were computed similarly. Fig. 1. Rys. 1. The localization of study area and design of experiment: 1 peripheral part of gaps, 2 central part of gaps Lokalizacja terenu badań i schemat eksperymentu: 1 część peryferyjna luk, 2 część centralna luk Acta Sci. Pol.
5 Recolonisation process Statistical analysis Statistical analysis of data on light intensity, soil humidity and soil temperature was based on a Student s t-test (comparison between means), which was used to establish whether there had been significant differences in: a) light intensity at the soil surface in the central and peripheral parts of gaps at every study site, b) soil humidity in the central and peripheral parts of gaps at every study site, c) soil temperature in the central and peripheral parts of gaps at every study site. The nonparametric Mann-Whitney U-test was used to establish if there had been significant differences in: a) the total number of taxa/seedlings appearing in the central and peripheral parts of gaps at every study site, b) the abundance of seedlings of particular taxa appearing in the central and peripheral parts of gaps at every site. All analyses were computed using STATISTICA 10 software (StatSoft). RESULTS Taking all patches into account, light intensity and soil moisture in the centres of openings were greater than in the peripheries, to a remarkable extent. Light intensity in the centres of gaps ranged from to lx, while in the peripheries it measured from to lx. Soil temperature in the middle of openings measured from 11.2ºC to 14.8ºC; at the edges of gaps, from 11.6ºC to 12.5ºC. Soil humidity presented the inverse tendency: the water content of the ground in the central parts of openings measured from 22.1 to 32.3%, whereas in the peripheral parts it ranged from 18.9% to 38.0% (Table 2). For all study sites, the numbers of species found in the central and peripheral parts of openings were quite similar, from 8.1 to 23.5 and from 7.8 to 21.6, respectively (Table 3). The numbers of seedlings recorded in the central and peripheral parts of gaps did not differ significantly either, ranging from to and from to 703.8, respectively. Species found in the seedling pool presented different patterns of gap colonisation (Table 4). The majority of taxa colonized the central and peripheral parts of openings in a similar way. There were 33, 32 and 28 species in patches I, II and III, respectively. Among taxa appearing most abundantly in all sites were: Cirsium arvense, Polygonum bistorta, Serratula tinctoria, Solidago canadensis, Succisa pratensis. In all patches, taxa were found which colonised the centres of openings particularly. Among the best colonisers in patch I were: Filipendula ulmaria, Achillea millefolium, Galium boreale, Lysimachia vulgaris, Betula pendula, Leucanthemum vulgare, Galinsoga sp., Erigeron sp. The central parts of gaps in patch II were colonised by Filipendula ulmaria and Sonchus arvensis, while in patch III Leucanthemum vulgare appeared most abundantly. The lowest number of taxa appeared mostly at the edges of openings. This group of species was represented by Sanguisorba officinalis, Betonica officinalis and Lychnis flos-cucculi, which was noted in patch I. Agricultura 14(1) 2015
6 38 K. Kostrakiewicz-Gierałt Table 2. The mean (±SD) light intensity level, soil moisture and soil temperature in peripheral and central parts of gaps in patch dominated by small meadow species (I), prevailed by large-tussock grasses (II) and overgrown by shrubs and trees (III) in Tabela 2. Średnie (±SD) wartości natężenia światła, wilgotności gleby oraz temperatury gleby w obwodowej i centralnej części luk w płacie zdominowanym przez niewielkie gatunki łąkowe (I), z przewagą wysokokępowych traw (II) oraz zarośniętym przez krzewiaste gatunki wierzb i otoczonym drzewami (III) w latach Environmental parameter Czynnik środowiskowy Light intensity (lx) Natężenie światła (lx) Water content in the soil Zawartość wody w glebie % Soil temperature Temperatura gleby ºC Patch Płat I II III I II III I II III Peripheral part Część obwodowa (± 5026) (± 4438) (± 4867) 22.1 (± 6.0) 33.1 (± 6.0) 39.3 (± 7.0) 12.5 (± 5.7) 11.4 (± 5.9) 11.2 (± 5.6) Central part Część centralna (± 4248) (± 4 810) (± 4 528) 18.9 (± 4.0) 30.5 (± 6.0) 38.0 (± 4.0) 14.8 (± 6.1) 12.0 (± 6.0) 11.6 (± 5.4) The statistical significance level (Student s t-; P) Poziom istotności statystycznej (test t-studenta; P) 31.3 (P < 0.001) 19.5 (P < 0.001) 24.9 (P < 0.001) (P < 0.001) -8.9 (P < 0.001) -5.3 (P < 0.001) 8.9 (P < 0.001) 2.1 (P 0.05) 2.3 (P 0.05) Table 3. The mean number of species and seedlings (±SD) in 1 m 2 of peripheral and central parts of gaps in patch dominated by small meadow species (I), prevailed by large-tussock grasses (II) and overgrown by shrubs and trees (III) in Tabela 3. Średnia liczba gatunków i siewek (±SD) na 1 m 2 części obwodowej i centralnej luk w płacie zdominowanym przez niewielkie gatunki łąkowe (I), z przewagą wysokokępowych traw (II) oraz zarośniętym przez krzewiaste gatunki wierzb i otoczonym drzewami (III) w latach Patch Płat Peripheral part Część obwodowa Central part Część centralna The statistical significance level (the U Mann-Whitney test) Poziom istotności statystycznej (test U Manna-Whitneya) I 21.6 (± 7.8) (± 5.8) 91.5 ns Taxa II 14.8 (± 5.9) (± 6.2) Taksony ns III 7.8 (± 4.1) 8.13 (± 3.1) ns I (± 235.5) (± 187.5) 63.5 * Seedlings II (± 128.1) (± 125.8) Siewki ns III (± 90.8) (± 110.2) 85.0 ns the symbols mean the level of statistical significance of differences between peripheral and central parts of gaps: *P 0.05; ns not significant symbole oznaczają poziom istotności statystycznej różnic pomiędzy peryferyjną i centralną częścią luk: *P 0.05; ns nieistotny Acta Sci. Pol.
7 Recolonisation process Table 4. The mean number of seedlings of particular taxa per 1 m 2 of peripheral (1) and central (2) parts of gaps in patch dominated by small meadow species (patch I), prevailed by large-tussock grasses (patch II) and overgrown by shrubs and trees (patch III) in the years Tabela 4. Średnia liczba siewek poszczególnych gatunków na 1 m 2 peryferyjnej (1) i centralnej (2) części luk w płacie zdominowanym przez niewielkie gatunki łąkowe (płat I), z przewagą wysokokępowych traw (płat II) oraz zarośniętym przez krzewiaste gatunki wierzb i otoczonym drzewami (płat III) w latach The group of species Grupa gatunków Species Patch I Płat I Statistical significance level Poziom istotności statystycznej Patch II Płat II Statistical significance level Poziom istotności statystycznej Patch III Pat III Statistical significance level Poziom istotności statystycznej Caltha palustris ns ns ns Cardamine pratensis ns Carex sp ns ns ns Centaurea jacea ns ns Cirsium arvense ns ns ns Crepis paludosa ns ns Chenopodium album ns ns ns Daucus carrota ns ns ns Dianthus superbus ns ns ns Geranium pratense ns ns ns Iris sibirica ns ns ns Juncus sp ns ns ns Lathyrus pratensis ns ns ns Lotus corniculatus ns ns ns Mentha sp ns ns ns Myosotis sp ns ns ns Plantago lanceolata ns ns ns A Poaceae ns ns ns Polygonum bistorta ns ns ns Populus sp ns ns Potentilla erecta ns ns ns Prunella vulgaris ns ns Ranunculus acer ns ns Rumex acetosa ns ns ns Salix sp ns ns ns Selinum carvifolia ns ns Serratula tinctoria ns ns ns Solidago Canadensis ns ns ns Succisa pratensis ns ns ns Taraxacum sp ns ns Trifolium pretense ns ns Urtica dioica ns ns ns Valeriana officinalis ns ns ns Vicia cracca ns Viola sp ns ns ns Agricultura 14(1) 2015
8 40 K. Kostrakiewicz-Gierałt Table 4 continue cd. tabeli Achillea millefolium * ns ns Betula pendula * ns ns Erigeron sp * ns Filipendula ulmaria ** * ns B Galinsoga sp * Galium boreale ** ns ns Leucanthemum vulgare ** * Lysimachia vulgaris * ns ns Sonchus arvensis ns * Betonica officinalis ** ns ns C Lychnis flos-cucculi * ns Sanguisorba officinalis *** ns ns A taxa colonizing peripheral and central parts of openings in similar extent gatunki kolonizujące w równym stopniu część centralną i peryferyjną luk B taxa dominating in central parts of gaps gatunki dominujące w części centralnej C taxa prevailing in peripheral parts of gaps gatunki dominujące w części peryferyjnej the symbols mean the level of statistical significance of differences between peripheral and central parts of gaps: *P 0.05; **P < 0.001; ***P < 0.001; ns not significant symbole oznaczają poziom istotności statystycznej różnic pomiędzy peryferyjną i centralną częścią luk *P 0.05; **P < 0.001; ***P < 0.001; ns nieistotny DISCUSSION The studies showed that microenvironmental conditions differ depending on a given position in a gap. The much lower light availability in the periphery of an opening compared to the centre may be due to shading of the gap s edge by the leaves and stems of adjacent plants. Additionally, the peripheries of openings were particularly prone to clonal ingrowth of individuals occurring in the immediate vicinity, such as Galium boreale, Potentilla erecta, Poa trivialis, and Lysimachia vulgaris. Rapid ramet encroachment may lead to rapid occupation of bare soil and may contribute to substantial reductions in irradiance level. According to the predictive model proposed by Anten and Hirose [1999], both tall and short taxa may intercept the photoperiod very effectively. Our investigations proved that, with a decrease in solar radiation reaching the ground surface in the peripheries of gaps, soil temperature diminishes and ground humidity increases, while deep light penetration in the centres of openings leads directly to rapid increases in soil temperature and ground desiccation. The effect of plant canopy shading on the retardation of water evaporation and modification of ground temperature has been observed over a wide spectrum of habitats [Pierson and Wright 1991, Todd et al. 1991, Van Miegroet et al. 2000, Raz-Yaseef et al. 2010, Myers-Smith and Hik 2013]. Our investigations documented that, despite the heterogeneity of microclimatic and edaphic conditions recorded in the central and peripheral parts of gaps, the number of recruits was similar. Moreover, the majority of species colonize the centres and edges of gaps in a similar fashion. These findings are in disagreement with previous studies documenting that plant cover may remarkably reduce seedling recruitment of Dianthus superbus [Kostrakiewicz-Gierałt 2013b], Selinum carvifolia [Špačkova et al. 1998], Acta Sci. Pol.
9 Recolonisation process Serratula tinctoria [Stammel et al. 2006], Solidago canadensis [Rebele 2000], and Succisa pratensis [Kotorová and Lepš 1999, van der Meer 2013]. Our results showed that taxa preferring the central parts or edges of openings appeared in the seedling pool. The occurrence of such species, particularly in patch I, may be linked with the low height of standing vegetation, allowing the influx of diaspores into gaps. The absence of differences observed in patches II and III may be due to the proximity of large tussock grasses, as well as high-growing herbaceous species and shrubs. Such species may act as effective traps for hydrochorous and anemochorous seeds, reducing the influx of propagules and their deposition in openings. In addition, other authors [McEvoy and Cox 1987, Bullock and Moy 2004, Pounden et al. 2008] have argued that diaspores with appendages, such as kapok, comae or pappi, may be caught by umbels and stems with fully deployed leaves. Additionally, the dense vegetation in patches II and III may slow the wind, modify the turbulence regime, and finally suppress the dispersal and deposition of anemochorous diaspores in openings. A similar phenomenon was observed by Greene and Johnson [1996] in forest communities, where the probability of seed deposition in clearings diminished with their distance from the edge of forest. Based on a combination of our results and the published data, it may be concluded that colonizers of the central parts of gaps include annuals producing numerous light, wind-dispersed, positively photoblastic diapores such as Galinsoga sp. [Jursik et al. 2003, Ivany 1973, De Cauwer et al. 2014], Sonchus arvensis [Lewin 1948], Erigeron sp. [Regehr and Bazzaz 1979], the light-demanding pioneer tree Betula pendula [Atkinson 1992], and the perennial Galium boreale [Jankowska-Błaszczuk et al. 1998], which prefers sunny stands. On the other hand, the greater abundance of seedlings of Leucanthemum vulgare in the centres of gaps is not consistent with findings of Howarth and Williams [1968], who argued that achenes of the aforementioned plant are insensitive to light intensity. Our results are in accordance with many observations concerning the influence of adjacent plants on seedling recruitment. Our investigations showing that Lysimachia vulgaris, Filipendula ulmaria and Achillea millefolium recruit mostly in the centres of openings support the findings of several authors [Hutchings and Booth 1996, Roth et al. 1999, Allison 2002, Falińska et al. 2010] documenting that substantial competitive pressure from established vegetation might hamper the appearance and survivability of generative offspring. Moreover, our results documenting that the offspring of Sanguisorba officinalis and Betonica officinalis predominantly colonize the edges of gaps are consistent with the findings of Lepš [1999], who argued that these species may recruit in the vicinity of neighbouring plants. On the other hand, contrary to our results, Rasran et al. [2007] found that location in the immediate vicinity of established vegetation had a negative impact on the density of seedlings of Lychnis flos-cuculi. Comparing our observations with previous findings [Kostrakiewicz-Gierałt 2015], it might be concluded that species prevailing in the centres of gaps also dominate in large openings, while taxa prevailing in the peripheries of gaps dominate in small openings. This phenomenon supports the observations of Kotanen [1997], who claimed that the colonisation process in the centres and peripheries of gaps of considerable size corresponds with the colonisation of large and small openings. In light of our investigations, it can be stated that heterogenous microsite conditions in openings enable the recruitment of taxa with various germination requirements and contribute to the maintenance of species diversity. Agricultura 14(1) 2015
10 42 K. Kostrakiewicz-Gierałt REFERENCES Allison, V.J. (2002). Nutrients, arbuscular mycorrhizas and competition interact to influence seed production and germination success in Achillea millefolium. Funct. Ecol., 16/6, Anonymous, (2003). Interpretation Manual of European Union Habitats. European Commission, DG Environment. Nature and Biodiversity. ( legislation/habitatsdirective/docs/2007_07_im.pdf). Anten, N.P.R., Hirose, T. (1999). Interspecific differences in aboveground growth patterns result in spatial and temporal partitioning of light among species in a tall-grass meadow. J. Ecol., 87, Atkinson, M.D. (1992). Betula pendula Roth. (B. verrucosa Ehrh.) and B. pubescens Ehrh. J. Ecol., 80/4, Bullock, J.M., Moy, I.L. (2004). Plants as seed traps: inter-specific interference with dispersal. Acta Oecol., 25, Csapodý, V. (1968). Keimlingsbestimmungsbuch der Dikotyledonen. Akademia Kiado, Budapeszt. De Cauwer, B., Devos, R., Claerhout, S., Bulcke, R., Reheul, D. (2014). Seed dormancy, germination, emergence and seed longevity in Galinsoga parviflora and G. quadriradiata. Weed Res., 54, Council Directive 92/43/EEC of 21 May 1992 on the Conservation of Natural Habitats and of Wild Fauna and Flora-Official Journal L 206, P, Council Directive 97/62/EC of 27 October 1997 adapting to technical and scientific progress Directive 92/43/EEC on the Conservation of Natural Habitats and of Wild Fauna and Flora- Official Journal L 305, P, Denisiuk, Z. (1991). Interaction between agriculture and nature conservation in Poland. ICUN Press, Gland, Switzerland and Cambridge Press UK, 12, Dubiel, E. (1991). Map of actual vegetation of the city of Cracow. Zesz Nauk UJ, Prace Bot., 22, Dubiel, E. (1996). Meadows in Cracow. I. Molinio-Arrhenatheretea class. Studia Ośr. Dok Fizjogr. PAN., 24, Falińska, K., Lembicz, M., Jarmolowski, A., Borkowska, L. (2010). Patterns of genetic diversity in populations of Filipendula ulmaria (L.) at different stages of succession on a meadow abandoned for 30 years Pol. J. Ecol., 58, Fibich, P., Vitová, A, Macek, P., Lepš J., Cáceres M. (2013). Establishment and spatial associations of recruits in meadow gaps. J. Veg. Sci., 24, Fuller, R.M. (1987). The changing extent and conservation interest of lowland grasslands in England and Wales: a review of grassland surveys Biol. Conserv., 40, Green, B.H. (1990). Agricultural intensification and loss of habitat, species and amenity in British grasslands: review of historical change and assessment of future prospects. Grass and Forage Sci., 45, Greene, D.F., Johnson, E.A. (1996). Wind dispersal of seeds from a forest into a clearing. Ecology, 77, Howarth, S.E., Williams, J.T. (1968). Chrysanthemum leucanthemum L. J.Ecol., 56(2), Hölzel, N., Otte, A. (2003a). Restoration of a species-rich flood meadow by topsoil removal and diaspore transfer with plant material. Appl. Veg. Sci., 6, Hölzel, N., Otte, A. (2003b). Assessing soil seed bank persistence in flood-meadows: The search for reliable traits. J. Veg. Sci., 15, Hutchings, M.J., Booth, K.D. (1996). Studies of the feasibility of re-creating chalk grassland vegetation on ex-arable land. II. germination and early survivorship of seedlings Under Different Management Regimes. J. Appl. Ecol., 33/5, Isselstein, J., Tallowin, J.R.B., Smith, R.E.N. (2002). Factors affecting seed germination and seedling establishment of fen-meadow species. Restoration Ecology, 10/2, Ivany, J.A., Sweet, R.D. (1973). Germination, growth, development, and control of Galinsoga. Weed Sci., 21, Acta Sci. Pol.
11 Recolonisation process Janeček, S., Lepš, J. (2005). Effect of litter, leaf cover and cover of basal internodes of the dominant species Molinia caerulea on seedling recruitment and established vegetation. Acta Oecol., 28(2), Jankowska-Blaszczuk, M., Kwiatkowska, A.J., Panufnik, D., Tanner, E. (1998). The size and diversity of the soil seed banks and the light requirements of the species in sunny and shady natural communities of the Białowieża Primeval Forest. Plant Ecol., 136, Jursik, M., Soukup, J., Venclová, V., Holec, J. (2003). Seed dormancy and germination of Shaggy soldier (Galinsoga ciliata Blake.) and Common lambsquarter (Chenopodium album L.). Plant Soil Environ., 49, Kostrakiewicz-Gierałt, K. (2012). The impact of neighbourhood and gap character on seedling recruitment of Trollius europaeus L. and Iris sibirica L. in Molinietum caeruleae meadows. Biodiv. Res. Conserv., 28, Kostrakiewicz-Gierałt, K. (2013a). The impact of disturbance gradient on recruitment of clonal plant species in Molinietum caeruleae meadows. Pol. J. Ecol., 61, Kostrakiewicz-Gierałt, K. (2013b). The effectiveness of asexual and sexual reproduction in clonal species Dianthus superbus L. in different site conditions the consequences for population development. Ecological Questions, 18, Kostrakiewicz-Gierałt, K. (2014). The effects of successional stage and size of gaps on recruitment of clonal plants in overgrowing Molinietum caeruleae meadows. Acta Agrobot., 67/4, Kostrakiewicz-Gierałt, K. (2015). The impact of time of gap origin on microenvironmental conditions and seedling recruitment in abandoned patches of rare, endangered community- Molinietum caeruleae meadow. Int. J. Conserv. Sci., in press. Kotanen, P.M. (1997). Effects of gap area and shape on recolonisation by grassland plants with different reproductive strategies. Canadian Journal of Botany, 75, Kotorová, I., Lepš, J. (1999). Comparative ecology of seedling recruitment in an oligotrophic wet meadow. J. Veg. Sci., 10, Křenová Z., Lepš L. (1996). Regeneration of a Gentiana pneumonanthe population in an oligotrophic wet meadow. J. Veg. Sci. 7, Lepš, J. (1999). Nutrient status, disturbance and competition: an experimental test of relationships in a wet meadow. J. Veg. Sci., 10, Lepš, J. (2014). Scale- and time-dependent effects of fertilization, mowing and dominant removal on a grassland community during a 15-year experiment. J. Appl. Ecol., 51, Lewin, R.A. (1948). Sonchus L. J. Ecol., 36/1, Pounden, E., Greene, D.F., Quesadaand, M., Conteras Sánchez, J.M. (2008). The effect of collisions with vegetation elements on the dispersal of winged and plumed seeds. J. Ecol., 96, Van Miegroet, H., Hysell, M.T., Johnson, A.D. (2000). Soil microclimate and chemistry of spruce-fir tree islands in Northern Utah. Soil Sci. Soc. Am. J., 64, McEvoy, P.B., Cox, C.S. (1987). Wind dispersal distances in dimorphic achenes of ragwort, Senecio jacobaea. Ecology., 68(6), Mirek, Z., Piękoś-Mirkowa, H., Zając, A., Zając, M. (2002). Flowering plants and pteridophytes of Poland. A checklist. W. Szafer Institute of Botany, Polish Academy of Science Kraków. Muller, F.M. (1978). Seedlings of the North-Western European lowland. A flora of seedlings. Dr W. Junk B.V. Publishers, The Hague, Boston, Centre for Agricultural Publishing and Documentation Wageningen. Muller, S. (2000). Diversity and management practice required to ensure conservation of rare and locally threatened species in grassland: a case studies at regional scale (Lorraine, France). Biodivers. Conserv., 11, Myers-Smith, I.H., Hik, D.S. (2013). Shrub canopies influence soil temperatures but not nutrient dynamics: An experimental test of tundra snow shrub interactions. Ecol Evol., 3/11, Agricultura 14(1) 2015
12 44 K. Kostrakiewicz-Gierałt Overbeck, G., Kiehl, K., Abs, C. (2003). Seedling recruitment of Succisella inflexa in fen meadows: Importance of seed and microsite availability. Appl. Veg. Sci., 6(1), Pierson, F.B., Wright, J.R. (1991). Variability of near-surface soil temperature on sagebrush rangeland. J. Range Manage, 44, Poschold, P., Biewer, H. (2005). Diaspore and gap availability are limiting species richness in wet meadows. Folia Geobot., 40, Prach, K. (1993). Vegetational changes in a wet meadow complex, South Bohemia, Czech Republik. Folia Geobot. Phytotax., 28, Rasran, L., Vogt, K., Jensen, K. (2007). Effects of litter removal and mowing on germination and establishment of two fen-grassland species along a productivity gradient. Folia Geobot., 42, Raz-Yaseef, N., Rotenberg, E., Yakir, D. (2010). Effects of spatial variations in soil evaporation caused by tree shading on water flux partitioning in a semi-arid pine forest. Agricultural and Forest Meteorology, 150, Rebele, F. (2000). Competition and coexistence of rhizomatous perennial plants along a nutrient gradient. Plant Ecol., 147, Regehr, D.L., Bazzaz, F.A. (1979). Population dynamics of Erigeron canadensis, a successional winter annual. J. Ecol., 67(3), Roth, S., Seeger, T., Poschlod, P., Pfadenhauer, J., Succow, M. (1999). Establishment of helophytes in the course of fen restoration. Appl. Veg. Sci., 2, Schmiede, R., Otte, A., Donath, T.W. (2012). Enhancing plant biodiversity in species-poor grassland through plant material transfer the impact of sward disturbance. Appl. Veg. Sci., 15, Špačkova, I, Kotorová, I., Lepš, J. (1998). Sensivity of seedling recruitment to moss, litter and dominant removal in an oligotrophic wet meadow. Folia Geobot., 33, Špačkova, I., Lepš, J. (2004). Variability of seedling recruitment under dominant, moss and litter removal over four years. Folia Geobot., 29, Stammel, B., Kiehl, K., Pfadenhauer, J. (2006). Effects of experimental and real land use on seedling recruitment of six fen species. Basic and Applied Ecology, 7(4), Todd, R.W., Klocke, N.L., Hergert, G.W., Parkhurst, A.M. (1991). Evaporation from soil influenced by crop shading, crop residue and wetting regime. Transactions of the ASAE, 34(2), van der Meer, S., Dahlgren, J.P., Mildén, M., Ehrlén, J. (2013). Differential effects of abandonment on the demography of the grassland perennial Succisa pratensis. Popul. Ecol., 56(1), Vitová, A., Lepš, J. (2011). Experimental assessment of dispersal and habitat limitation in an oligotrophic wet meadow. Plant Ecol., 212(8), Weiterová, I. (2008). Seasonal and spatial variance of seed bank species composition in an oligotrophic wet meadow. Flora, 203, PROCES REKOLONIZACJI W PŁATACH OPUSZCZONYCH ŁĄK Molinietum caeruleae WPŁYW POZYCJI W LUKACH NA WARUNKI MIKROSIEDLISKOWE ORAZ REKRUTACJĘ SIEWEK Streszczenie. Badania były prowadzone w płatach nieużytkowanych łąk Molinietum caeruleae: płat I był zdominowany przez niewielkie gatunki łąkowe, w płacie II przeważały wysokokępowe trawy, natomiast płat III był zarośnięty przez krzewiaste gatunki wierzb i otoczony drzewami. W każdym płacie losowo wykonano po 15 okrągłych luk o promieniu 30 cm przez usunięcie roślin i ściółki. Następnie każdą lukę podzielono na część centralną (o promieniu 20 cm) oraz część obwodową. Natężenie światła oraz temperatura gleby były znacznie wyższe w środku odsłonięć niż na ich Acta Sci. Pol.
13 Recolonisation process obrzeżach, natomiast wilgotność gruntu prezentowała odwrotną tendencję. Pomimo heterogennych warunków całkowita liczba gatunków/siewek odnotowana w środku i na skraju odsłonięć były podobne. W puli siewek przeważały gatunki kolonizujące równomiernie całą powierzchnię luk, odnotowano również taksony pojawiające się głównie w centralnej części odsłonięć oraz kiełkujące zwłaszcza na obrzeżach luk. W świetle przeprowadzonych badań stwierdzić można, że niejednorodne warunki siedliskowe umożliwiają rekrutację taksonów o rożnych wymaganiach, przyczyniając się do wzrostu zróżnicowania gatunkowego w płatach nieużytkowanych łąk. Słowa kluczowe: łąka trzęślicowa, natężenie światła, rekrutacja siewek, różnorodność gatunkowa, temperatura gleby, wilgotność gleby Accepted for print Zaakceptowano do druku: For citation Do cytowania: Kostrakiewicz-Gierałt, K. (2015). Recolonisation process in abandoned Molinietum caeruleae meadows the influence of position within gaps on microsite conditions and seedling recruitment. Acta Sci. Pol. Agricultura, 14(1), Agricultura 14(1) 2015
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