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Abstract：
The elemental composition of rainwater, throughfall, and soil solutions of a forest ecosystem in the acid rain control region of southwest China was investigated during 2007-2008 to assess the acid buffering capacity of different forest covers. A possible seasonal distribution of wet deposition was identified. Sulfur was determined as the dominant acidification precursor in this region. The chemical composition of rainfall intercepted by the forest canopy was modified substantially; generally the ion concentrations were increased by dry deposition and foliar leaching. As an exception, the concentration of NH(4)(+) and NO(3)(-) decreased in throughfall, which was probably due to the absorption of nitrogen by the leaves. Elemental concentrations in soil solutions decreased with depth. The water conservation capacity of different forests was also evaluated. The most appropriate forest vegetation for water conservation and remediation of acid precipitation in this region was explored for the sake of ecosystem management, ecological restoration and economic development.
摘要：
雨水的元素组成，穿透，在2007-2008年期间，对中国西南酸雨控制区的森林生态系统的土壤溶液进行了调查，以评估不同森林覆盖的酸缓冲能力。确定了湿沉降的可能季节性分布。硫被确定为该地区的主要酸化前体。森林冠层拦截的降雨的化学成分得到了实质性改变；通常，离子浓度通过干沉降和叶面淋洗而增加。作为例外,通入水中NH(4)(+)和NO(3)(-)的浓度下降，这可能是由于叶片对氮的吸收。土壤溶液中的元素浓度随深度而降低。还评估了不同森林的水源保护能力。为了进行生态系统管理，探索了该地区最适合涵养水源和修复酸性降水的森林植被，生态恢复和经济发展。
