【摘 要】
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An extensive knowledge base of spatial and temporal distribution of nutrients in the soil is imperative to a wide range of disciplines within agriculture science for optimal crop production and ecosys
【机 构】
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State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy o
【出 处】
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第四届城市、工业、交通和矿山土壤国际会议(The 4th International Conference on Sol
论文部分内容阅读
An extensive knowledge base of spatial and temporal distribution of nutrients in the soil is imperative to a wide range of disciplines within agriculture science for optimal crop production and ecosystem preservation.This paper examines the spatial and temporal variability of soil pH,organic matter (OM),cation exchange capacity (CEC),total nitrogen (TN),total phosphorus (TP),available phosphorus (PAy),and available potassium (KAy) on Aquic Cambosols (Entisols) (n =179) and Stagnic Anthrosols (Inceptisols) (n =94) in Zhangjiagang County,China from 1980 to 2004.Nutrient input was monitored during the same time period and correlated with nutrient variability in the county.Spatially,Anthrosols contain higher concentrations of OM,TN,and KAv,and have a higher CEC than Cambosols,but is more acidic and has lower concentrations of TP and PAy.Temporally,OM,CEC,TN,and PAv increased 2.15 g kg-1,1.6 cmol kg-1,0.21 g kg-l,and 3.3 mg kg-l,respectively,while TP and KAv decreased 30.16 mg kg-1 and 10.68 mg kg-1,respectively.Soil pH increased by 0.14 in Cambosols,but decreased dramatically by 1.02 in Anthrosols.In conclusion,agriculture production is having an adverse effect on the environment in Zhangjiagang County.Amount of N input should decrease,a different type and rate of P input should be used,and K input should increase for increased crop production and reduced nutrient loading.
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