玉米大豆间作对作物根长密度和土壤养分空间分布的影响OA

[Objective]To investigate the effects of maize-soybean intercropping on crop root length density and spatial distribution of soil nutrients in the oasis region of Xinjiang,aiming to provide a reference for improving the productivity of intercropping patterns.[Methods]Using maize variety Zhengdan 958 and soybean variety Dongsheng No.5 as experimental materials,three treatments were set:monocropped maize(MM),monocropped soybean(MS),and maize-soybean intercropping(IMS).Crop root length density(RLD),as well as organic matter,total nitrogen,total phosphorus,alkali-hydrolyzable nitrogen and available phosphorus contents in the 0-60 cm soil layer at the jointing,silking,and maturity stages,were measured.The yield and land equivalent ratio(LER)were also analyzed.[Results]Whole growth period,the total root length density of intercropped maize(IM)increased by an average of 49.43％compared with MM,while intercropped soybean(IS)increased by an average of 90.67％compared with MS;soil organic matter content in the 0-20 cm soil layer in IM decreased by an average of 14.11％compared with MM,while in the 20-40 cm soil layer in IS,it increased by an average of 8.57％compared with MS;soil total nitrogen content in the 0-20 cm and 20-40 cm soil layers in IM increased by an average 16.68％and 29.05％,respectively,compared with MM,while in the 0-20 cm,20-40 cm,and 40-60 cm soil layers in IS,it decreased by an average 24.51％,31.20％,and 42.80％,respectively,compared with MS;soil total phosphorus content in the 0-20 cm,20-40 cm,and 40-60 cm soil layers in IM increased by an average 27.84％,59.67％,and 141.55％,respectively,compared with MM,whereas in the 20-40 cm soil layer in IS,it decreased by an average 13.59％and in the 40-60 cm soil layer,it increased significantly by an average 134.01％compared with MS(P<0.05);soil alkali-hydrolyzable nitrogen content in the 0-20 cm,20-40 cm,and 40-60 cm soil layers in IM decreased by an average 6.97％,7.30％,and 25.37％,respectively,compared with MM,while in IS it decreased by an average 5.72％,17.46％,and 45.66％,respectively,compared with MS;soil available phosphorus content in the 40-60 cm soil layer in IM decreased by an average 31.10％compared with MM,and in the 0-20 cm,20-40 cm,and 40-60 cm soil layers in IS,it decreased by an average 29.47％,21.93％,and 19.53％,respectively,compared with MS.Yield of IM decreased significantly by 21.49％compared with MM(P<0.05),and yield of IS decreased significantly by 35.50％compared with MS(P<0.05).However,LER of the maize-soybean intercropping was 1.43(>1),indicating an intercropping advantage.[Conclusion]Although maize-soybean intercropping leads to intense competition for soil available nutrients and a suppression in crop yield,it can still improve soil nutrient content and overall crop yield through root spatial complementarity,demonstrating a significant intercropping advantage.