玉米苜蓿间作对黄土坡耕地养分流失的影响

在渭北黄土高原坡地建立24个径流小区,对玉米苜蓿间作、玉米单作、苜蓿单作、裸地降雨后侵蚀泥沙各养分含量进行测量和监测,结果表明:土壤全氮、全磷和有机质的损失量表现为裸地>玉米单作>玉米苜蓿间作>苜蓿单作;不同带宽间表现出随着玉米带宽的增大,全氮、全磷和有机质的损失量也增大;不同坡度土壤速效钾、速效磷、硝态氮、铵态氮的损失量随着坡度的增大而增大;间作下土壤速效钾、速效磷、硝态氮、铵态氮的损失量均小于玉米单作和裸地,但大于苜蓿单作。

Effect of Maize Intercropping Alfalfa on Nutrients Loss of Loess Slope Land

Based on the twenty-four runoff plots built on sloping lands on loss plateau north of Wei-he,the nutrient content of sediments under four difference conditions,namely alfalfa intercropping of corn,corn monoculture,alfalfa monoculture and bare soil after rainfall,were measured.The results showed that the sequence of the loss of the soil total nitrogen,phosphorus and organic was the bare land>maize monoculture>corn alfalfa>alfalfa monoculture;the total nitrogen,phosphorus and organic matter loss increased with the increase of corn bandwidth;the amount of available potassium,available phosphorus,nitrate,ammonium Nitrogen loss increased with the increase of slope;the losses of soil potassium,phosphorus,nitrate,ammonium nitrogen for alfalfa intercropping of corn were less than maize monoculture and bare land,but more than alfalfa monoculture.