[目的] 为探究不同植物群落切沟系统之间以及同一切沟不同部位间植被生长特性的差异。[方法] 以陕西省安塞区纸坊沟小流域5个典型植物群落切沟系统为研究对象,系统研究其物种多样性、盖度、地上生物量、枯落物蓄积量和地下生物量等植被生长特性。[结果] (1)地上生物量、枯落物和根系消减系数受植被类型的显著影响,表现为乔木切沟>灌木切沟>草本切沟,盖度表现为灌木切沟>草本切沟>乔木切沟;(2)切沟右壁(阳坡到半阳坡)物种多样性指数、盖度小于左壁(阴坡到半阴坡);(3)受水热条件综合影响 ...
苏旭飞, 张光辉, 曾荣昌
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通过实测不同植被下原状和人工覆盖不同枯落物的冲失土壤量及其所需时间、冲动枯落物的量和临界流量、枯落物的减流速度、不同植被下的土壤根重量和须根数量等,采用模糊数学方法对石灰岩区主要植被的水保功能进行了综合评判,得出侧柏的水保功能>黄背草>白草>野皂荚>毛黄栌>山合欢>荆条>酸枣>荒坡或弃耕地。
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