Department of Life Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK.
Environ Pollut. 2010 Sep;158(9):2940-5. doi: 10.1016/j.envpol.2010.06.006. Epub 2010 Jul 2.
Evidence from an international survey in the Atlantic biogeographic region of Europe indicates that chronic nitrogen deposition is reducing plant species richness in acid grasslands. Across the deposition gradient in this region (2-44 kg N ha(-1) yr(-1)) species richness showed a curvilinear response, with greatest reductions in species richness when deposition increased from low levels. This has important implications for conservation policies, suggesting that to protect the most sensitive grasslands resources should be focussed where deposition is currently low. Soil pH is also an important driver of species richness indicating that the acidifying effect of nitrogen deposition may be contributing to species richness reductions. The results of this survey suggest that the impacts of nitrogen deposition can be observed over a large geographical range.
来自欧洲大西洋生物地理区域的国际调查表明，慢性氮沉积正在降低酸性草原的植物物种丰富度。在该地区的沉积梯度（2-44 kg N ha(-1) yr(-1)）上，物种丰富度呈曲线响应，当沉积从低水平增加时，物种丰富度的减少最大。这对保护政策具有重要意义，表明为了保护最敏感的草原资源，应集中在目前沉积较低的地方。土壤 pH 也是物种丰富度的重要驱动因素，表明氮沉积的酸化作用可能导致物种丰富度降低。这项调查的结果表明，氮沉积的影响可以在很大的地理范围内观察到。
