生态环境学报Issue(7)：1130-1135,6.
喀斯特土壤微生物和活性有机碳对生态恢复的快速响应
Rapid Responses of Soil Microbes and Active Organic Carbon to Eco-restoration in Karst Region
摘要
Abstract
Eco-degradation problem generally occurs in karst region, and reforestation as an eco-restoration practice has been received more and more attention. Soil active organic carbon fractions generally show more sensitive response to environmental change and disturbance than soil total organic carbon, and also responses of soil microorganisms are sensitive. However, no information is available on soil active organic carbon and microbes following reforestation in time scales in karst region. Guzhou village representative for karst landscape was selected to conduct this study. We selected four reforestation sampling areas with a chronosequence of 2, 4, 8 and 12 years and one arable sampling area as control. As compared to the arable system, soil total organic carbon content did not change under 2-yr, or 4-yr reforestation, but significantly increased by 24% under 8-yr reforestation. Soil water soluble organic carbon, particulate organic carbon and labile organic carbon contents were significantly higher 62%, 36%and 38%, respectively under 2-yr reforestation than the arable system, and showed an increasing trend with reforestation ages. Relative contents of these carbon indicators also showed similar patterns. Consistently, soil microbial biomass carbon content, basal respiration and microbial quotient were significantly higher 56%, 27%and 54%, respectively under 2-yr reforestation than the arable system, and showed an increasing trend with reforestation ages. Microbial metabolic quotient showed opposite pattern. Our results indicate that these active organic carbon and microbial indicators can provide early indication for karst eco-restoration.关键词
土壤微生物/土壤有机碳/生态恢复/喀斯特地区Key words
soil microbe/soil organic carbon/eco-restoration/karst region分类
农业科技引用本文复制引用
唐政,李继光,李慧,张丽敏,李忠芳,娄翼来..喀斯特土壤微生物和活性有机碳对生态恢复的快速响应[J].生态环境学报,2014,(7):1130-1135,6.基金项目
国家重点实验室开发基金项目（LFSE2013-04）；中国博士后科学基金项目（2013T60200）；国家自然科学基金项目(41361068) （41361068）
