论文部分内容阅读
本文以滇西南中山湿性常绿阔叶林为研究对象，分析了大气降雨对该森林生态系统养分输入和输出的影响。结果表明，该地区在大气降雨过程中养分输入：Ｎ以大气降雨为主；Ｐ、Ｋ、Ｍｇ以穿透雨为主，它们分别占总输入量的６９．８５％、７７．３３％、９８．１９％和８０．４０％；Ｃａ养分输入，大气降雨和穿透雨约各占总输入量的一半，分别是４５．３５％和５４．３８％。养分输出以地下土壤渗漏为主，Ｎ、Ｐ、Ｋ、Ｃａ、Ｍｇ分别占总输出量的９６．５２％、８６．７９％、６９．１３％、９８．１７％和９７．２１％。在养分循环中Ｎ、Ｐ、Ｋ、Ｃａ分别增加了１５．９４１ｋｇ／ｈａ．ａ、０．３５３ｋｇ／ｈａ，ａ、３．８３ｋｇ／ｈａ．ａ和１．２６４ｋｇ／ｈａ．ａ．，而Ｍｇ则减少了０．６５４ｋｇ／ｈａ．ａ。
In this paper, the wetland evergreen broad-leaved forest in the southwestern Yunnan was studied, and the effect of rainfall on the nutrient input and output in the forest ecosystem was analyzed. The results showed that the input of nutrients in the region during the rainfall was N: rainfall, and P, K and Mg were mainly through rain, accounting for 69.85%, 77.33% and 98.3% of the total input respectively .19% and 80.40% respectively; Ca nutrient input, atmospheric rainfall and penetration rain each accounted for about half of the total input, which was 45.35% and 54.38% respectively. Nutrient output was dominated by underground soil seepage. N, P, K, Ca and Mg accounted for 96.52%, 86.79%, 69.13%, 98.17% and 97.21% of the total output, respectively. In the nutrient cycle N, P, K, Ca increased by 15.941kg / ha. a, 0.353 kg / ha, a, 3.83 kg / ha. a and 1.264 kg / ha. a. , While Mg decreased by 0.654 kg / ha. a.