Department of Life Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK.
Environ Pollut. 2011 Oct;159(10):2243-50. doi: 10.1016/j.envpol.2010.11.026. Epub 2010 Dec 16.
A survey of 153 acid grasslands from the Atlantic biogeographic region of Europe indicates that chronic nitrogen deposition is changing plant species composition and soil and plant-tissue chemistry. Across the deposition gradient (2-44 kg N ha(-1) yr(-1)) grass richness as a proportion of total species richness increased whereas forb richness decreased. Soil C:N ratio increased, but soil extractable nitrate and ammonium concentrations did not show any relationship with nitrogen deposition. The above-ground tissue nitrogen contents of three plant species were examined: Agrostis capillaris (grass), Galium saxatile (forb) and Rhytidiadelphus squarrosus (bryophyte). The tissue nitrogen content of neither vascular plant species showed any relationship with nitrogen deposition, but there was a weak positive relationship between R. squarrosus nitrogen content and nitrogen deposition. None of the species showed strong relationships between above-ground tissue N:P or C:N and nitrogen deposition, indicating that they are not good indicators of deposition rate.
对来自欧洲大西洋生物地理区的 153 个酸性草地的调查表明，慢性氮沉积正在改变植物物种组成以及土壤和植物组织的化学性质。在整个沉积梯度（2-44 千克氮公顷（-1）年（-1））上，草类丰富度相对于总物种丰富度增加，而杂草丰富度下降。土壤 C:N 比增加，但土壤可提取的硝酸盐和铵浓度与氮沉积没有任何关系。检查了三种植物地上组织的氮含量：Agrostis capillaris（草），Galium saxatile（杂草）和 Rhytidiadelphus squarrosus（苔藓）。两种维管束植物的组织氮含量均与氮沉积无关，但 R. squarrosus 氮含量与氮沉积呈弱正相关。这些物种中没有一种表现出地上组织 N：P 或 C：N 与氮沉积之间的强烈关系，这表明它们不是沉积率的良好指示物。
