草业学报Issue(12)：38-45,8.DOI:10.11686/cyxb2015008
三峡库区紫色土旱坡地农桑配置模式对土壤养分的影响
Effects of different crop-mulberry intercropping systems on nutrients in arid purple soils in the Three Gorges Reservoir Area
摘要
Abstract
To help address the problem of purple soil erosion on sloping land in Chongqing city,an experiment has been undertaken to investigate the effects of different crop-mulberry intercropping systems on soil nutri-ents.Four treatments were designed:crops were planted along transverse slopes (CT),crops were planted a-long transverse slopes with mulberry trees on the upper and lower slopes (T1 ),crops were planted along trans-verse slopes with mulberry trees on the upper,middle and lower slopes (T2 );and crops were planted along transverse slopes with mulberry trees on the middle slope and on the four sides of the slope (T3 ).The results showed that soil available nitrogen,available phosphorus,potassium and organic matter contents were signifi-cantly improved with mulberry intercropping.The sequence of improvement was T2 >T3 >T1 >CT.The ratios of carbon/nitrogen and carbon/phosphorus changed from 7 to 20 and from 10 to 27 respectively for the four treatments.The carbon/nitrogen and carbon/phosphorus ratios were largest in the T2 treatment for every slopelevel.Soil organic matter,nitrogen,potassium,carbon/nitrogen ratio,carbon/phosphorus ratio and crop out-put were all significantly positively correlated.In conclusion,crop-mulberry intercropping in hillside fields im-proved and maintained soil nutrients and to some extent decreased the ratios of carbon/nitrogen and carbon/phosphorus in uphill soils.These results can be used to guide the choice of water and soil conservation cropping modes in the Three Gorges Reservoir Area.关键词
三峡库区/紫色土/桑树布局/土壤养分Key words
Three Gorges Reservoir Areas/purple soil/the mulberry layout/soil nutrients引用本文复制引用
刘月娇,倪九派,张洋,周川..三峡库区紫色土旱坡地农桑配置模式对土壤养分的影响[J].草业学报,2015,(12):38-45,8.基金项目
国家科技支撑计划课题（2012BAD05B03）和中央高校基本科研业务费项目（XDJK2013A016）资助。 （）
