九寨沟林下地表径流及其与地表和土壤状况的关系

采用小样方人工模拟降雨,对九寨沟不同植被下不同坡度地表径流量进行了模拟。结果表明:在同一降雨事件下,地表草本盖度、苔藓盖度、凋落物盖度对地表径流量影响程度较大,而土壤初始含水量和腐殖质厚度的影响不大;同一坡度上不同林地类型的地表径流量无明显规律;相同林地类型上,辽东栎林下地表径流量随坡度增加而增大,冷杉林和云杉、辽东栎混交林下地表径流随坡度变化规律不明显。

Surface Runoff and Connection with Surface Status and Soil Under Three Forests in Jiuzhaigou World Nature Heritage Reserve

The study was conducted in three different forests of Jiuzhaigou World Nature Heritage Reserve. Surface runoff were simulated and the relationship between runoff and surface traits(herb cover, bryophyte cover,litter cover and slope gradient) and soil status(initial water content and humus thickness) were exploited. It was found that:(1) Under the same rain intensity and time, the surface traits including herb cover, bryophyte cover and litter cover strongly impacted surface runoff intensity, but soil status only displayed tiny action on it. (2)In the same slope gradients, very small differences of surface runoff intensity among different forest type were found. (3) In the same forest type, under oak forest, surface runoff changing along with slope gradients increased. Under forests mixed with spruce and oak trees and fir forest, very small differences of surface runoff intensity among different slope gradients were found.