摘要
采用野外调查和室内分析相结合的方法,就不同土地利用方式下土壤团聚体中主要养分的分布特征进行了研究。结果表明,不同土地利用方式下土壤团聚体均以>2 mm粒径为主,0.5～0.25 mm粒径团聚体含量最少。不同土地利用方式下土壤有机碳,全氮、全磷、全钾,速效氮、速效钾在团聚体中的分布存在一定差异。土壤团聚体中有机碳、全氮含量均随团聚体粒径的增大而减小,碱解氮、全磷和全钾的含量在团聚体中的分布较均匀,而速效钾含量随粒径的减小呈先增大后略减小的变化趋势。不同土地利用方式下,各粒径团聚体对土壤主要养分分布的影响程度有所不同。土壤团聚体对土壤养分的贡献率中约有40%来自>5 mm团聚体,这主要取决于团聚体含量的多少。
By the field investigation and laboratory analysis methods,distribution features of soil nutrient in soil aggregates were studied under the different land use.The results showed that the contents of soil aggregates were dominated by 2 mm,and the least content was 0.5～0.25 mm.The distribution of soil organic carbon,total nitrogen,total phosphorus,total potassium,available nitrogen and available potassium of aggregates had the discrepancy under the different land use.The content of soil organic carbon and total nitrogen decreased with the increasing particle size of soil aggregation.The distribution of available nitrogen,total phosphorus and total potassium were relatively even in various particle size of aggregates,and the contents of available potassium increased firstly and decreased slightly at last with the increasing particle size.The aggregates of different soil particle effect on the distribution of major nutrients in the soil were significant differences under different land use.The contribution rate of about 40% came from the aggregates by 5 mm,which depended on the aggregate contents of different particle size.
出处
《水土保持学报》
CSCD
北大核心
2010年第3期170-174,共5页
Journal of Soil and Water Conservation
基金
国家自然科学基金(40901138)
四川省教育厅重点项目(07ZA059)
四川省科技厅应用基础项目(2008JY0022)
地表过程与资源生态国家重点实验室开放基金资助项目(2008-KF-05)
中国科学院山地灾害与地表过程重点实验室开放基金资助项目
