四川中亚热带扁刺栲-华木荷群系不同演替阶段土壤含水率的研究

Percentage of soil absolute moisture content at different succession stages of Castanopsis platyacantha-Schima sinensis formation in central subtropical zone of Sichuan Province.

采用定位观测和方差分析的方法 ,对灌木以及 10、40和 2 0 0年生的扁刺栲 华木荷群落的土壤绝对含水率的时空特征进行了研究 .结果表明 ,除 10年生栲木荷群落外 ,群落土壤含水率与土壤深度的关系极显著 ;不同年龄段的栲木荷林地土壤含水率与季节的关系不显著 ;除 10余年生的栲木荷群落外 ,群落土壤含水率与坡向的关系不显著 ;土壤含水率与演替阶段的关系极显著 ;栲木荷群落发育 10和 40年后 ,其土壤涵养功能分别恢复到原始林的 73 %和 85 % ;

The temporal spatial characteristics of the percentage of soil absolute moisture content (PSAMC, defined as the percentage of soil water to dried soil) at different succession stages of C.platyacantha S.sinensis formation such as brush, 10 , 40 , and 200 years old C.platyacantha S.sinensis communities were studied, using the methods of orientation observation and variance analysis under the similar conditions including climates, topographies, landforms, and soils. The results indicated that the relationship between soil depth and PSAMCof all communities except for 10 years old community were significant. The effects of season on PSAMC at different stages of all C.platyacantha S. sinensis communities was not significant. Similarly, aspect had no notable effects on PSAMC of all communities but 10 years old community. Different succession phases had significant effects on PSAMC (0～60cm depth). The water retention ability of soil was restored up to 73% and 85% of primary C. platyacantha S. sinensis forests when C.platyacantha S.sinensis communities were 10 and 40 years old. PSAMC of different succession phases of C.platyacantha S. sinensis had obvious characteristics of fluctuation and chaos.