不同耕作施肥条件下玉米连作对黑土有机无机复合体性状的影响

Corn Continuous Cropping Under Different Tillage And Fertilization Practice Affacting On Characters Of Organo-mineral Complexes Of Black Soil

本文研究了不同耕作、施肥条件下玉米连作对黑土有机无机复合体组成、土壤有机碳及氮、磷在各级复合体中分配的影响。结果表明,经常施用有机肥料条件下的玉米连作可使土壤中粉粒复合体含量、土壤及各级复合体的有机碳、氮、磷的含量有不同程度的提高,并可使粉粒复合体的有机碳贮量也相应增加;玉米连作时如果连年秋翻,可促进土壤有机质的分解,各级复合体的有机碳含量及粉粒复合体的数量均相对减少,很少秋翻的土壤的情况则与之相反;玉米连作年限的长短,对有机无机复合体组成、有机碳含量及其在各级复台体中的分配的影响,主要取决于土壤的耕作、施肥及管理水平,经常施用有机肥并很少秋翻条件下的玉米连作,有利于土壤有机质的保持与积累,并促进土壤肥力的提高。

The compositions of organo -mineral complexes, distribution of organic cobbon, N, and P in complexes of black soil croppcnl with eonlinous corn with different tillage and fertilization practice were discussed in the current paper. The results showed that 1) often applying manure on corn continuous cropped field will enhance the xuitent of silty -size complex, the contents of OC, N, and P in complexes; 2) compared with the field of unploughed corn land, frequently ploughing (or year by year) may speed up decomposition of organic matter and decrease the contents of complexes and even organic carbon in complexes; 3) applying manure frequently and less ploughing may benefit the preservation and of organic carbon and improve soil fertility.