重庆市铁山坪针叶林和观音桥阔叶林的降水化学特征

研究并比较了重庆市铁山坪马尾松和观音桥樟树降水的化学特征,分析了大气降水的化学物质输入及其降 水淋溶对森林生态系统物质循环产生的影响,并对各种离子组分的来源进行了初步解析.结果表明:针叶林穿透 水有进一步酸化趋势,而阔叶林可以减缓酸化作用.大气降水和穿透水是养份输入的主要形式,其中以穿透水养 份输入为主.穿透水中N元素可能被吸收,其它营养元素则主要来自干沉降洗脱和植被的淋溶.

The Precipitation Chemistry of Coniferous and Broad-Leaved Forest in Chongqing City

In this paper the study on the chemical properties of the rainfall are carried out in coniferous forests and broad-leaved forests in Chongqing, and the influences of chemical substance import of rainfall and rain dripping on substance circulation of forest ecosystems are analyzed. To differ the source of all ions in forest throughfall, this problem is discussed. The results show that coniferous forests throughfall trends toward further acidified, while broad-leaved forests can alleviate the acidification effect. Concerning the nutrient import, rainfall and throughfall are both the main forms, but throughfall is much more important. The result indicated N is mainly absorbed by vegetation while other nutrient elements are mainly from dry deposition and leaching from vegetation.