摘要
降雨的水质在通过森林后会发生十分大的变化。本文选择了亚热带湿地松人工林,通过分别实测降雨过程中林外降雨、林内降雨及树干流的变化,及其相应的水质变化,分析了湿地松人工林地内雨量再分配的特点,在此基础上阐述了通过降雨过程湿地松人工林地内营养元素的输入及循环过程的特点。分析结果表明,林外降雨、林内降雨及树干流的P、N、Ca、Mg、Na、K等浓度有很大的差异。与水分运动相对应,各种元素以点源或面源的形式进入流域,从而构成了两个过程与速度均不同的循环。此外,也讨论了降雨与树表面淋溶作用对林地物质输入的贡献。
Water quality of rainfall changes greatly after passing through trees can-
opy in the watershed. In this paper, an artificial pinus forest has been chosen
to measure the precipitation inside and outside of forest, stemflow as well as
the variations of their chemical contens. By analysing the characteristics of
rainfall partitioning, the patterns of chemicals migrations in the field have
been discussed.
The results showed that the concentrations of TP, TN, Ca, Mg, Na and
K were different among rainfall, throughfall and stemflow. In accordance wi-
th the rainfall partitioning, chemicals entered the field both as point source
and area source, from which two different processes of motion were found.
The chemical contributions in the field by rainfall and leaching from the tree
was also discussed.
基金
中山大学科学研究基金
关键词
人工松林
雨量分配
物质循环
淋溶
Artifical pine forest
Partition of rain
Matter cycle
Water quality
Leaching