物种丰富度
沉积(地质)
氮气
横断面
样方
环境科学
生态系统
生态学
农学
环境化学
化学
生物
沉积物
古生物学
有机化学
作者
Carly J. Stevens,Nancy B. Dise,J. O. Mountford,David Gowing
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2004-03-19
卷期号:303 (5665): 1876-1879
被引量:1317
标识
DOI:10.1126/science.1094678
摘要
A transect of 68 acid grasslands across Great Britain, covering the lower range of ambient annual nitrogen deposition in the industrialized world (5 to 35 kg Nha-1 year-1), indicates that long-term, chronic nitrogen deposition has significantly reduced plant species richness. Species richness declines as a linear function of the rate of inorganic nitrogen deposition, with a reduction of one species per 4-m2 quadrat for every 2.5 kg Nha-1 year-1 of chronic nitrogen deposition. Species adapted to infertile conditions are systematically reduced at high nitrogen deposition. At the mean chronic nitrogen deposition rate of central Europe (17 kg Nha-1 year-1), there is a 23% species reduction compared with grasslands receiving the lowest levels of nitrogen deposition.
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