荒漠草原区弃耕地植被演替过程中植物群落生物量及土壤养分变化.pdfVIP

应 用 生 态 学 报摇 2011年12月摇 第22卷摇 第12期摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 摇 ChineseJournal of Applied Ecology,Dec. 2011,22(12):3145-3149 荒漠草原区弃耕地植被演替过程中植物群落 生物量及土壤养分变化* 安摇 慧摇 杨新国摇 刘秉儒摇 李学斌摇 何秀珍摇 宋乃平** (宁夏大学西北退化生态系统恢复与重建教育部重点实验室/ 西部生态与生物资源开发联合研究中心,银川750021) 摘摇 要摇 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 ~60 cm 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. 关键词摇 荒漠草原摇 弃耕地摇 植被演替摇 生物量摇 土壤养分 文章编号摇 1001-9332(2011)12-3145-05摇 中图分类号摇 Q948.1;S153.6摇 文献标识码摇 A Changes of plant community biomass and soil nutrients during the vegetation succession on abandoned cultivated land in desert steppe region. AN Hui,YANG Xin鄄guo,LIU Bing鄄ru,LI Xue鄄bin,HE Xiu鄄zhen,SONG Nai鄄ping (Ministry of EducationKey Laboratory of Restoration and Reconstruction of Degraded Ecosystem in North鄄western China/ United Centerfor Ecology Research and Bioresource Exploitation in Western China,Ningxia University, Yinchuan 750021, China). 鄄Chin.J.Appl.Ecol. ,2011,22(12):3145-3149. Abstract:By the method of substituting temporal serial with spatial serial,and taking five aban鄄 doned cultivated landswith different ages (1,4,9,12,and20 years) in desert steppe region as test objects,thispaperstudiedthechangecharacteristicsofplantcommunitybiomassandsoilnutri鄄 ents 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 in0-60 cm soil layer in鄄 creased first,decreased then,and increa