摘要
通过长期定位试验,研究不同植被覆盖与施肥管理对黑土活性有机碳库形成及碳库管理指数ICM的影响。采用33、167、333mmol·L-13种浓度KMnO4氧化法测定土壤高活性有机碳、中等活性有机碳和活性有机碳含量。结果表明,在相同时段、相同母质和地形气候条件下,不同植被覆盖与施肥管理措施对黑土的活性有机碳库形成及ICM均有显著影响。人工模拟自然生态系统草地处理,22a间0—20cm表层土壤有机碳比耕地施用化肥处理增加13.2%,活性有机碳增加39.9%,ICM增加51.4;农田生态系统化肥配施有机肥处理,14a间0—20cm表层土壤有机碳比耕地施用化肥处理增加25.48%,活性有机碳增加30.71%,ICM增加33.0。ICM与各活性有机碳的相关系数为活性有机碳(0.982)>高活性有机碳(0.955)>中等活性有机碳(0.652)。总有机碳、总有机氮与3种活性有机碳在α=0.01或α=0.05水平上相关显著。
Effects of vegetation and fertilization on black soil labile organic carbon and carbon management index（ICM） were studied in a long-term fertilization experiment.Soil labile organic carbon was measured with KMnO4 oxidation method,using three concentration levels,33,167 and 333 mmol·L^-1 into three fractions,namely,high labile organic carbon,moderate labile organic carbon,and low labile organic carbon.Results indicate that vegetation and fertilization management showed remarkable influence on formation of labile organic carbon pool of black soil.In the simulated natural ecosystem,22 years of cultivation increased organic carbon content by 13.2%,labile organic carbon content by 39.9%,and carbon management index（ICM） by 51.4 in the 0-20 cm soil layer of Treatment GF（grassland）,while in the farmland ecosystem,15 years of cultivation with application of chemical fertilizers and organic matter did increase organic carbon content by 25.48%,labile organic carbon content by 30.71%,and ICM by 33.0 in the 0-20 cm soil layer.The correlation coefficients of ICM were 0.982,0.955 and 0.652,with labile organic carbon,high labile organic carbon,and moderate labile organic carbon.Moreover,total organic carbon,and nitrogen were found to have significant correlation with the three kinds of labile organic carbon.
出处
《生态与农村环境学报》
CAS
CSSCI
CSCD
北大核心
2008年第4期1-5,共5页
Journal of Ecology and Rural Environment
基金
中国科学院知识创新工程项目(KZCX2-YW-407,KZCX3-SW-NA3-27)
国家重点基础研究发展计划(2005CB121101)
中国科学院中国生态系统研究网络(CERN)资助项目
关键词
黑土
植被覆盖
施肥管理
活性有机碳
碳库管理指数
black soil
vegetation
fertilization
labile organic carbon
carbon management index
