人为干扰对川西亚高山针叶林土壤物理性质的影响

研究了川西亚高山针叶人工林在几种不同强度人为干扰下林地土壤物理性质。结果表明，随人为干扰强度的增加，土壤中细土（粉粒、粘粒）和大团聚体数量减少，小团聚体和原生土壤颗粒增加；土壤表层孔隙度减小，尤其是大孔隙明显减少；土壤有效水降低，持水供水能力减弱，渗透系数减小。川西亚高山人工针叶林土壤生态功能随人为干扰强度的增加而减弱，建议在最易受人为干扰的造林地区，最好是在造林初期封山育林。图1表5参13

EFFECT OF HUMAN-INDUCED DISTURBANCE ON SOIL PHYSICAL PROPERTIES OF SUBALPINE CONFEROUS FORESTS IN WESTERN SICHUAN

The soil physical properties of subalpine coniferous plantation in western Sichuan under the different intensities of human-induced disturbance were studied. The results showed that with the increasing of human-induced disturbance intensity, the amounts of small soil particle (silt and clay) and large aggregate decreased, and the amounts of soil micro-aggregate and natural soil particle increased; soil porosity decreased in the surficial soil,especially, in which the large porosity significantly decreased; the content of soil available water and the capacity of water-holding and water-supplying reduced. The coefficient of soil permeation also decreased. The soil ecological function of supalpine coniferous plantation decreased with the increasing of human-induced disturbance intensity in western Sichuan. It was suggested that the best method should be the closing off afforested mountains for protection at the first stage planting in the area of intense human-induced disturbance. Fig 1, Tab 5, Ref 13