渭北旱塬兼顾冬小麦产量和环境效益的农田适宜氮肥用量  

Optimum nitrogen application rate to maximum yield and environment protection for winter wheat in Weibei dryland,China

作　　者：刘艳妮[1,2] 马臣 于昕阳[1,2] 翟丙年 李紫燕[1,2] 王朝辉[1,2] LIU Yan-ni;MA Chen;YU Xin-yang;ZHAI Bing-nian;LI Zi-yan;WANG Zhao-hui(College of Natural Resources and Environment,Northwest A＆F University,Yangling 712100,Shaanxi,China;Key Laboratory of Plant Nutrition and Agro-environment in Northwest China,Ministry of Agriculture,Yangling 712100,Shaanxi,China）.)

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]农业部西北植物营养与农业环境重点实验室,陕西杨凌712100

出　　处：《应用生态学报》2018年第8期2509-2516,共8页Chinese Journal of Applied Ecology

基　　金：国家科技支撑计划项目(2015BAD23B04);公益性行业(农业)科研专项(201503124);国家自然科学基金项目(31772389;40501332);国家小麦现代产业技术体系建设专项(Z225020803)资助~~

摘　　要：为了明确渭北旱区兼顾冬小麦产量和环境效益的农田系统适宜氮肥用量,通过连续3年的田间试验,研究了冬小麦产量、氮肥利用效率、氮素表观损失和土壤氮素平衡对施氮量的响应.结果表明:随着氮肥用量的增加,不同年份冬小麦产量均呈现先增加后降低的趋势,而累计氮肥表观利用率表现为显著降低趋势,3季冬小麦均在施氮150 kg·hm^(-2)时达到相对较高的产量和氮肥表观利用率;随着施氮量的增加,氮肥残留显著增加,当施氮量在75~150kg·hm^(-2)时,表观损失量和损失率变化不明显,而施氮超过150 kg·hm^(-2),表观损失量和损失率显著增加.综合考虑保证冬小麦既可获得相对较高的产量和氮肥利用率,又能保持收获前后土壤硝态氮库的基本稳定,同时也可将氮肥表观损失降至较低水平,150 kg·hm^(-2)是渭北旱区冬小麦较为合理的施氮量.To get the optimum nitrogen（ N） fertilization rate which could guarantee wheat yield and protect environment,we examined wheat yield,N use efficiency,apparent N loss and soil N balance in Weibei dryland with a 3-year field experiment. The results showed that annual wheat yield increased and then decreased as N application rate increased in all the years with different annual rainfall,but the cumulative apparent N use efficiency significantly decreased. Higher yield and N use efficiency were obtained at the fertilization rate of 150 kg·hm-2. Residual nitrate-N concentrations significantly increased with the increases of N application rate. When the N application rate was between 75 and 150 kg·hm-2,the apparent N loss and loss rate were nearly the same,but if N application rate was higher than 150 kg · hm-2,the apparent loss and loss rate significantly increased. In conclusion,N application rate at 150 kg · hm-2 in Weibei dryland could guarantee high yield and N use efficiency,and simultaneously maintain residual nitrate-N concentration and reduce apparent N loss.

关 键 词：渭北旱塬 冬小麦 产量 环境效益 适宜施氮量 

分 类 号：S512.11[农业科学—作物学]