三种客观赋权法分析草地管理措施对土壤有机碳含量的影响  

The impact of grassland management practices on soil organic carbon:An analysis with three objective weighting methods.

作　　者：戎郁萍[1] 赵敏[1] 朱玲玲[1] 白可喻[2] 

机构地区：[1]中国农业大学动物科技学院,北京100193 [2]中国农业科学院农业资源与农业区划研究所,北京100081

出　　处：《生态学杂志》2012年第4期987-993,共7页Chinese Journal of Ecology

基　　金：公益性行业(农业)科研专项经费(200903060;201003019);中央级公益性科研院所基本科研业务费专项(2010-29)资助

摘　　要：草地生态系统中90%的碳贮存于土壤中,影响草地植被和土壤理化性质的草地管理措施影响草原土壤有机碳含量。综合分析及评价草地管理措施对草原土壤有机碳的影响,对草地碳汇可持续管理模式的形成具有重要意义。本研究采用熵权法、标准离差法、CRITIC法等3种客观赋权法分析了火烧、刈割耙除、施肥等草地管理措施对草地土壤有机碳含量的影响,对不同草原管理措施的处理组合进行了综合评分及排序。结果表明:3种客观赋权法都可以用来分析草地管理措施对土壤有机碳的影响,>0.25mm土壤团聚体的权重最大,各处理综合排序顺序相同;刈割耙除后施半量有机肥和半量化肥的综合评分值最高,火烧不施肥的综合评分值最低;火烧和刈割耙除都显著降低土壤有机碳含量,火烧对土壤有机碳含量的影响更大;火烧和刈割耙除结合施肥处理均可有效地维持草地土壤有机碳含量,以施入半量有机肥和半量化肥处理的综合评价分值最高。Nearly 90% of carbon in grassland ecosystem is stored in soil,and grassland managements have impact on the soil organic carbon content through regulating the vegetation and the soil physical and chemical properties.To comprehensively analyze and evaluate the effects of grassland management practices on the soil organic carbon would have significance in establishing the sustainable management mode of grassland soil carbon sink.In this study,three objective weighting methods including entropy-weighting method,standard deviation method,and CRITIC were adopted to analyze the effects of burning,mowing,and fertilization on grassland soil organic carbon,and the scoring and ordering of the management practices and their combinations were made.All the three objective weighting methods were available to the analysis of the effects of grassland management practices on soil organic carbon,and the results obtained were similar.Among the parameters analyzed,0.25 mm soil aggregate had the greatest weighing value.Mowing combined with 1/2 organic and 1/2 chemical fertilizations obtained the highest score,while burning with no fertilization had the lowest one.Both burning and mowing decreased the soil organic carbon markedly,with more impacts under burning.Burning and mowing combined with fertilization could effectively maintain the soil organic carbon content,with the best effect for the treatments with 1/2 organic and 1/2 chemical fertilizers.

关 键 词：土壤有机碳 多指标综合评价 熵权法 标准离差法 CRITIC法 

分 类 号：S812[农业科学—草业科学]