作　　者： ; ; ; ; ; ; ; ;

机构地区： 甘肃省农业科学院

出　　处： 《应用生态学报》 2013年第4期1001-1008,共8页

摘　　要： 以陇东黄土旱塬已进行7年的田间定位试验为基础,分析了免耕和传统耕作条件下5个施肥处理冬小麦收获期土壤水分、土壤容重(2011年)及土壤养分和产量(2005—2011年)变化,探讨了耕作方式和施肥对冬小麦-春玉米轮作农田土壤蓄水保墒效果及土壤肥力和产量的影响.结果表明:2011年免耕条件下0～200cm各土层土壤含水量、0～20cm和20～40cm土层土壤容重及土壤有机质、速效氮、速效磷含量均高于传统耕作.相同耕作条件下氮磷化肥与有机肥配施处理的土壤有机质、速效氮、速效磷含量高于其他施肥处理;不同耕作方式及施肥处理下速效钾呈逐年减少的趋势;传统翻耕处理的产量高于免耕,相同耕作条件下氮磷化肥与有机肥配施处理产量最高,不施肥对照产量最低.不同耕作方式和施肥处理的土壤蓄水保墒能力和肥力效应以免耕优于传统翻耕,产量以传统翻耕下有机无机肥配施处理最好. Based on the 7-year field experiment on the dryland of east Gansu 2005-2011, this paper analyzed the variations of soil moisture content, bulk content at harvest time of winter wheat and of the grain yield under no-tillage of Northwest China in density, and nutrients and conventional till- age and five fertilization modes, and approached the effects of different tillage and fertilization modes on the soil water storage and conservation, soil fertility, and grain yield under winter wheat/ spring corn rotation. In 2011, the soil moisture content in 0-200 cm layer and the soil bulk density and soil organic matter and available nitrogen and phosphorus contents in 0-20 cm and 20-40 cm layers under different fertilization modes were higher under no-tillage than under conventional till- age. Under the same tillage modes, the contents of soil organic matter and available nitrogen and available phosphorus were higher under the combined application of organic and inorganic fertiliz- ers, as compared with other fertilization modes. The soil available potassium content under different tillage and fertilization modes decreased with years. The grain yield under conventional tillage was higher that under no-tillage. Under the same tillage modes, the grain yield was the highest un- der the combined application of organic and inorganic fertilizers, and the lowest under no fertiliza- tion. In sum, no-tillage had the superiority than conventional tillage in improving the soil waterstorage and conservation and soil fertility, and the combined application of organic and inorganic fertilizers under conventional tillage could obtain the best grain yield.

关 键 词： 耕作方式 土壤水分动态 土壤肥力 产量

领　　域： [农业科学] [农业科学]