闽北不同类型毛竹林生态系统植被状况对地表径流的影响

The Effect of Different Phyllostachys edulis and Forests Ecosystem on the Surface Runoff Coefficient in Northern Fujian Province

以中亚热带杉木纯林(Ⅰ)和常绿阔叶林(Ⅴ)为对照,运用灰色关联法对闽北地区竹杉混交林(Ⅱ)、毛竹纯林(Ⅲ)、竹阔混交林(Ⅳ)3种不同类型毛竹林的生态系统植被状况影响地表径流系数进行了定量分析。结果表明,植被状况参数对地表径流系数影响的大小顺序是:草本层盖度>凋落物层有效持水量>物种丰富度>林分高度>凋落物总储量>土壤稳渗速率>灌木层盖度>乔木层郁闭度>土壤层有效持水量=土壤孔隙度;5种林分的植被状况对地表径流系数的影响以常绿阔叶林最大,竹杉混交林对地表径流的影响最小,灰关联度排序为:常绿阔叶林(0.763)>杉木纯林(0.756)>竹阔混交林(0.697)>毛竹纯林(0.621)>竹杉混交林(0.529)。

Grey correlation analysis was used to study the effects of vegetation status on the surface runoff coefficient for three typical P. edulis forests, P. edulis and C. unningharrtia lartceolata mixed forest （Ⅱ）, P. edulis pure forest （Ⅲ） and P. edulis and broad-leaved tree mixed stands （Ⅳ） in the North of Fujian Province, compared with C. lanceolata forest （Ⅰ） and evergreen broad-leaved forest （Ⅴ）. The results showed that the order of the effects on the surface runoff coefficient by the parameters of vegetation status was： herb layer coverage 〉 effect water capacity of litter layer 〉 species richness 〉 forest height 〉 litter layer thickness 〉 soil steady infiltration rate 〉 shrub layer coverage 〉 tree layer coverage 〉 soil effect water capacity = soil porosity, evergreen broad-leaved forest had the greatest effect on surface runoff coefficient in the 5 kinds of forest ecosystems, while the 19. edulis and C. unrtinghamia lartceolata mixed forest was the last one. The order of the grey correlation reading was： Ⅴ （0.763） 〉 Ⅰ （0.756） 〉Ⅳ（0.697） 〉Ⅲ （0.621） 〉Ⅱ （0.529）.