Base cation depletion, eutrophication and acidification of species-rich grasslands in response to long-term simulated nitrogen deposition
Base cation depletion, eutrophication and acidification of species-rich grasslands in response to long-term simulated nitrogen deposition
复制标题
DOI：
10.1016/j.envpol.2007.11.006
复制
发表时间：
2008-09-01
影响因子：
8.9
通讯作者：
Leake, Jonathan R.
中科院分区：
文献类型：
--
作者：
Horswill, Paul;O'Sullivan, Odhran;Leake, Jonathan R.
研究了位于英国氮素和酸雨污染最严重地区之一的酸性和石灰岩草原上污染物氮沉降对土壤和叶元素浓度的影响，采用NH4NO3历史数据表明，这两个草原在过去50年里都发生了酸化，处理了8-10年，N ha(-2)y(-1)为35-140 kg。氮沉降处理使草地土壤流失了23-35%的有效碱基(钙、镁、钾和钠)，使土壤酸化了0.2-0.4个pH单位。铝、铁和锰被石灰岩草原杂交种活化和吸收，并向酸性草原土壤迁移。两个草地的矿质氮素有效性都有所增加，许多物种表现出叶片氮素的富集性。这项研究首次提供了氮沉降消耗草原土壤盐基阳离子的确凿证据。由此产生的酸化、金属迁移和富营养化是推动植物区系变化的原因之一。(C)2007爱思唯尔有限公司。保留所有权利。
Pollutant nitrogen deposition effects on soil and foliar element concentrations were investigated in acidic and limestone grasslands, located in one of the most nitrogen and acid rain polluted regions of the UK, using plots treated for 8-10 years with 35-140 kg N ha(-2) y(-1) as NH4NO3 Historic data suggests both grasslands have acidified over the past 50 years. Nitrogen deposition treatments caused the grassland soils to lose 23-35% of their total available bases (Ca, Mg, K, and Na) and they became acidified by 0.2-0.4 pH units. Aluminium, iron and manganese were mobilised and taken up by limestone grassland forbs and were translocated down the acid grassland soil. Mineral nitrogen availability increased in both grasslands and many species showed foliar N enrichment. This study provides the first definitive evidence that nitrogen deposition depletes base cations from grassland soils. The resulting acidification, metal mobilisation and eutrophication are implicated in driving floristic changes. (C) 2007 Elsevier Ltd. All rights reserved.