草业科学2018，Vol.35Issue(5)：1004-1012,9.DOI:10.11829/j.issn.1001-0629.2017-0570
短期降雨改变对荒漠草原植物群落特征的影响
Effect of short-term rainfall change on plant community characteristics in desert steppe
摘要
Abstract
In order to study the effects of long-term grazing and short-term rainfall variations on vegetation characteristics of a grassland ecosystem,an experiment using different rainfall gradients(50% reduction,am-bient,50% increase,and 100% increase in environmental rainfall)was conducted on the site of a long-term manipulative stocking rate experiment(no grazing,light grazing,moderate grazing,and heavy grazing),and the response(in terms of individual quantities,species diversity and aboveground biomass of the plant commu-nity)to rainfall changes was analyzed.The results showed that:1)variations in long-term grazing and short-term rainfall had significant effects on community coverage(P<0.05)(community coverage decreased with in-creasing grazing intensities but increased with increasing rainfall);2)the rainfall variations had significant effects on species diversity(P<0.05)(there was an increase of 22 species with 100% increase in environmental rainfall under moderate grazing conditions);3)the long-term grazing and short-term rainfall variations had sig-nificant effects on aboveground biomass(P<0.05)(The highest aboveground biomass was 408.3 g·m—2under ambient rainfall under no-grazing conditions,and the lowest aboveground biomass was 118.2 g·m—2with 50%reduction in environmental rainfall in heavy grazing conditions).关键词
降雨/放牧效应/载畜率/植被特征Key words
rainfall/grazing effects/stocking rate/vegetation characteristics分类
农业科技引用本文复制引用
闫宝龙,王占文,王悦骅,康静,宋晓辉,王忠武,韩国栋..短期降雨改变对荒漠草原植物群落特征的影响[J].草业科学,2018,35(5):1004-1012,9.基金项目
国家重点研发项目(2016YFC0500504) （2016YFC0500504）
教育部科技创新团队项目(IRT_17R59) （IRT_17R59）
国家自然科学基金项目(31560140) （31560140）
西部之光项目 （）
