Drip irrigation incorporating water conservation measures:Effects on soil water-nitrogen utilization,root traits and grain production of spring maize in semi-arid areas  

作　　者：WU Yang BIAN Shao-feng LIU Zhi-ming WANG Li-chun WANG Yong-jun XU Wen-hua ZHOU Yu 

机构地区：[1]Jilin Academy of Agricultural Sciences,Changchun 130033,P.R.China [2]Jiujiang University,Jiujiang 332005,P.R.China [3]Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,P.R.China [4]Chongqing Academy of Agricultural Sciences,Yongchuan 402160,P.R.China

出　　处：《Journal of Integrative Agriculture》2021年第12期3127-3142,共16页农业科学学报（英文版）

基　　金：the National Key Research and Development Program of China(2016YFD0300103);the Science and Technology Project of Education Department of Jiangxi Province,China(GJJ190933);the Jiangxi Youth Science Foundation Project,China(20202BABL215003);the Innovation Engineering Plan Project of Jilin Province,China(CXGC2018ZY019);the Chongqing Science and Technology Commission Project,China(cstc2018jxjl80008).

摘　　要：The Northeast Plain is the largest maize production area in China,and drip irrigation has recently been proposed to cope with the effects of frequent droughts and to improve water use efficiency(WUE).In order to develop an efficient and environmentally friendly irrigation system,drip irrigation experiments were conducted in 2016-2018 incorporating different soil water conservation measures as follows:(1)drip irrigation under plastic film mulch(PI),(2)drip irrigation under biodegradable film mulch(BI),(3)drip irrigation incorporating straw returning(SI),and(4)drip irrigation with the tape buried at a shallow soil depth(OI);with furrow irrigation(FI)used as the control.The results showed that PI and Bl gave the highest maize yield,as well as the highest WUE and nitrogen use efficiency(NUE)because of the higher root length density(RLD)and better heat conditions during the vegetative stage.But compared with BI,PI consumed more soil water in the 20-60 and 60-100 cm soil layers,and accelerated the progress of root and leaf senescence due to a larger root system in the top 0-20 cm soil layer and a higher soil temperature during the reproductive stage.SI was effective in improving soil water and nitrate contents,and promoted RLD in deeper soil layers,thereby maintaining higher physiological activity during the reproductive stage.FI resulted in higher nitrate levels in the deep 60-100 cm soil layer,which increased the risk of nitrogen losses by leaching compared with the drip irrigation treatments.RLD in the 0-20 cm soil layer was highly positively correlated with yield,WUE and NUE(P<0.001),but it was negatively correlated with root nitrogen use efficiency(NRE)(P<0.05),and the correlation was weaker in deeper soil layers.We concluded that Bl had advantages in water-nitrogen utilization and yield stability response to drought stress,and thus is recommended for environmentally friendly and sustainable maize production in Northeast China.

关 键 词：drip irrigation ROOT water use efficiency nitrogen use efficiency MAIZE 

分 类 号：S513[农业科学—作物学]