北京大学学报（自然科学版）2017，Vol.53Issue(4)：765-774,10.DOI:10.13209/j.0479-8023.2017.086
青藏高原高寒草甸土壤物理性质及碳组分 对增温和降水改变的响应
Effects of Warming and Altered Precipitation on Soil Physical Properties and Carbon Pools in a Tibetan Alpine Grassland
摘要
Abstract
The authors conducted experiments to simulate warming and alter precipitation since 2011, and investigated soil physical properties (soil particle size and pH) and carbon pools (soil total carbon (STC), soil organic carbon (SOC), soil extractable organic carbon (EOC) and microbial biomass carbon (MBC)) in July 2013. The results showed that warming significantly increased soil temperature and decreased soil moisture at the depths of 0-20 cm, and altered precipitation affected soil moisture at 0-20 cm depth, but had no influence on soil temperature. At the depth of 0-10 cm, warming significantly increased SMBC; increased precipitation significantly reduced EOC content and elevated MBC content; decreased precipitation significantly decreased soil sandy proportion, MBC content and increased soil clay proportion and EOC content. At the depth of 10-20 cm, increased precipitation led a reduction on EOC content. The interactions of warming and altered precipitation on soil indexes were not detected. The pattern of soil properties was changed mainly by altered precipitation, not warming, according to the results of PCA. The results suggest that given precipitation will be continuously increased in the future, increased precipitation may lead a reduction in soil clay proportion and EOC content in the topsoil, and subsequently affect plant primary production and micrbial communities in this region.关键词
土壤粒径/土壤pH/土壤全碳/土壤有机碳/土壤可提取有机碳/土壤微生物生物量碳Key words
soil particle size/soil pH/soil total carbon/soil organic carbon/soil extractable organic carbon/soil microbial biomass carbon分类
农业科技引用本文复制引用
杨新宇,林笠,李颖,贺金生..青藏高原高寒草甸土壤物理性质及碳组分 对增温和降水改变的响应[J].北京大学学报（自然科学版）,2017,53(4):765-774,10.基金项目
973计划和重大科学研究计划项目(2014CB954003, 2014CB954004)资助 （2014CB954003, 2014CB954004）
