长江三峡花岗岩坡面土管空间分布特征

Spatial variability of pipes in granite slope in the Three Gorges of Yangtze River.

为深入研究土管的空间分布对土壤水分运动的影响 ,该研究在长江三峡花岗岩坡面选择了一受人为活动影响较小的天然次生马尾松林地作为试验场地 ,开挖土壤剖面 ,观测并研究了其土管空间分布特性 .研究结果表明土管主要分布在距地表以下 0 8～ 1 0m范围内 ,经Iδ 指数检验其分布类型为聚集分布型 .

The macropores in soil and matrix are named soil pipes. The soil pipes could produce remarkable influence on soil water movement, therefore it is important to study the spatial variability of the soil pipes. A natural second Pinus massoniana woodland which is not heavily influenced by people in the granite region of the Three Gorges of Yangtze River has been selected as an experiment plot. A section in the slope was dug to investigate the spatial variability of the soil pipes. The result of the investigation shows that most of the pipes distribute between 0.8 m and 1.0 m under the ground in the soil section. And the distribution of the soil pipes is the group type, tested by the method of the Iδ index. It is presumed that the causes of pipes are mainly soil forming process, roots corruption and animal action in soils.