热带山地次生雨林的水化学特征及其与降雨量关系的研究

H ydrochemical Characteristics and Their Regression Analysis on the Secondary Rain Forest Ecosystem of Tropical Upland in China

采用了小集水区技术和定位观测方法,研究分析了降雨、穿透水、树干流及径流的各化学物质含量和迁移变化特征。指出:降雨和穿透水是热带山地次生雨林生态系统的主要化学物质输入源;次生雨林不仅具有较强的养分截获和生态调节功能,而且具有较强的化学过滤、吸贮功能;且建立了穿透水、干流和总径流的各化学元素含量与降雨特征因子的多元线性关系。

As part of the systematic study, the element contents in rainfall, throughfall, stemflow, surface flow and stream were measured from October 1990 to October 1991 at the secondary rain forest catchment of tropical upland in Jianfengling,Hainan Island,China. The hydrochemical properties and migratory changes of nutrient in the hydrochemistry system were studied and analyzed by the method of small catchment and orientation observation. Element contents of the throughfall and stemf low increased by 0.43~15.1 and 0.26~24.7 times more than that of the precipitation respectively. Except Ca, Si and Al, the elements of stream were less than that of the through-fall. The output contents of Ca and Si were more than the input of both. It is pointed out that the rainfall and throughfall are an input source of the hydrochemical elements of the secondary rain forest ecosystem of tropical upland. The system not only has stornger hydrochemical regulating function but also has the function of chemical filtration, uptake and store. Moreover, multivariate linear models have been established between each element content and the characteristics factors of precipitation in throughfall, stem-flow, stream.