作　　者： ; ; ; ; ; ;

机构地区： 宁夏大学

出　　处： 《应用生态学报》 2011年第12期3145-3149,共5页

摘　　要： 采用空间变化代替时间变化的方法,以荒漠草原区不同年限(1、4、9、12和20年)弃耕地为对象,研究弃耕演替过程中植物群落生物量与土壤养分的变化特征.结果表明:随弃耕年限的增加,弃耕地植物群落地上生物量呈先减少后增加的趋势,0～60cm土层的土壤全氮、全磷和有机碳含量及碳密度均呈先增大后减小再增大的趋势,4年和20年弃耕地的土壤全氮、全磷含量达到峰值.弃耕演替过程中土壤全氮和有机碳含量对植物群落生物量的影响大于土壤容重和土壤全磷. By the method of substituting temporal serial with spatial serial,and taking five abandoned cultivated lands with different ages（1,4,9,12,and 20 years） in desert steppe region as test objects,this paper studied the change characteristics of plant community biomass and soil nutrients during vegetation succession.With the increasing abandoned years,the plant community aboveground biomass on the abandoned lands increased after an initial decrease,whereas the total nitrogen,total phosphorus,organic carbon contents,and carbon density in 0-60 cm soil layer increased first,decreased then,and increased again,with the maximum values of soil total nitrogen and phosphorus contents appeared on the abandoned lands with the ages 4 and 20 years.During vegetation succession,the effects of soil total nitrogen and organic carbon on plant community biomass were greater than those of soil total phosphorus and soil bulk density.

关 键 词： 荒漠草原 弃耕地 植被演替 生物量 土壤养分

领　　域： [生物学] [农业科学] [农业科学]