摘要
研究表明 ,各处理的土壤容重呈下降趋势 ,土壤总孔隙度和土壤毛管孔隙度也有增加倾向 ,以“紫云英-玉米 -芝麻”和“油菜‖紫云英 /玉米 /玉米‖绿豆”两个处理最为明显。各处理土壤有机质、全N、有效N、全P、有效P、全K含量都基本平衡或有不同程度的增加 ;有效K和pH值都呈下降趋势。就不同处理而言 ,各土壤肥力指标的变化很不一致 ,经综合评价 ,“油菜‖紫云英 /玉米 /玉米‖绿豆”综合评价指标值最高 。
The soil bulk gravity of all cropping systems studied has the tendency of decreasing, while total soil porosity, and capillary soil porosity tend to increase. These tendencies in the treatments of “Chinese milk vetch-maize-sesame” and “canola‖Chinese milk vetch/maize/maize‖mung bean” systems are more significant than other cropping systems. Soil organic matter, total nitrogen, available nitrogen, total phosphorous, available phosphorous and total potassium content of all cropping systems have the tendency of increasing, while available potassium and pH value decrease during the experiments. The values of soil fertility targets are changed according to different cropping systems. By principal component analysis, the comprehensive assessment index of “canola‖Chinese milk vetch/maize/maize‖mung bean” is the highest one, this cropping system is in favor of soil fertility maintenance.
出处
《江西农业大学学报》
CAS
CSCD
2000年第4期503-508,共6页
Acta Agriculturae Universitatis Jiangxiensis
基金
江西省主要学科跨世纪学术技术带头人培养计划项目"江西农业生态系统持续发展模式及机理研究"的资助内容之一
