Dupre, Cecilia; Stevens, Carly J.; Ranke, Traute; Bleeker, Albert; Peppler-Lisbach, Cord; Gowing, David J.; Dise, Nancy B.; Dorland, Edu; Bobbink, Roland and Diekmann, Martin
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|DOI (Digital Object Identifier) Link:||http://dx.doi.org/10.1111/j.1365-2486.2009.01982.x|
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Our study investigates the negative impact of nitrogen (N) deposition on species richness in acidic grasslands, based on a temporal comparison of vegetation data spanning a period of almost 70 years. We compiled a large data base of plots assigned to the Violion caninae grassland type, composed of managed, but unfertilized semi-natural grasslands on nutrient-poor, acidic soils. In total 1114 plots, mainly from Great Britain, the Netherlands and Germany, were compiled, dating back to 1939. Environmental site information included geographical and soil (mean Ellenberg values) variables as well as estimates of cumulative N and sulphur (S) deposition since 1939. Statistical analyses were carried out separately for the data subsets from the three regions. In all regions, the vegetation differentiation was mainly related to soil acidity and nutrient availability, as well as to the year of sampling and the cumulative amounts of N and S deposition. Plot-species richness of vascular plants and bryophytes (analysed for Great Britain only) decreased with time and analyses suggest these are affected by various factors, notably soil pH, but also latitude and cumulative N deposition. The latter explained more of the variation in species number than the year of sampling and cumulative S deposition, which supports the interpretation that the decline in species richness is mainly caused by increasing N availability and less by altered management and soil acidification. For Great Britain and Germany, cumulative N deposition showed a strong negative relationship with several biodiversity measures, especially the proportion of dicots, whereas it was positively related to the proportion of grass species. In general, our results give temporal evidence for the negative effect of N deposition on species richness in semi-natural vegetation.
|Item Type:||Journal Article|
|Copyright Holders:||2009 Blackwell Publishing Ltd|
|Keywords:||bryophytes; soil acidity; sulphur deposition; vascular plants; Violion grasslands|
|Academic Unit/Department:||Science > Environment, Earth and Ecosystems|
|Interdisciplinary Research Centre:||OpenSpace Research Centre (OSRC)
Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
|Depositing User:||Users 9 not found.|
|Date Deposited:||11 Jan 2010 12:17|
|Last Modified:||24 Nov 2012 21:39|
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