摘要
为了探明施氮量对黄土旱塬区冬小麦(Triticum aestivum L.)籽粒产量和麦田土壤水分动态的影响规律,以抗旱性冬小麦品种长武58为供试材料,于2006～2008年连续两个年度在陕西省长武县对不同施氮量条件下麦田土壤贮水量动态、耗水规律、小麦产量和夏闲期降水补给率等特征进行研究。结果表明,麦田土壤贮水量随季节和降水明显变化,同一生育时期2.7m土层的土壤贮水量基本随施氮量的增加而减少。偏旱年每公顷施氮300kg和平水年每公顷施氮225kg均能够获得当年最大的籽粒产量和水分利用效率。每公顷施氮75kg和225kg均能在夏闲期获得较大的降水补给率。每公顷施氮225kg更有利于黄土旱塬区冬小麦的高产和稳产。
A field experiment was conducted to investigate the effects of nitrogen application on winter wheat （Triticum aestivum L.） grain yield and soil moisture dynamics in rain-fed farmland of the Loess Plateau, China. Soil moisture storage, water consumption, grain yield and precipitation recharge rate in summer fallow period under different N application were studied by using the drought resistance winter wheat cultivar Changwu58 as test material from 2006 to 2008 in Changwu county, Shaanxi province. The results showed that soil moisture storage in 2.7m soil layers changed with season and precipitation, and decreased with the increasing of nitrogen application. Both 300 kgN·ha^-1 in dry year and 225 kgN·ha^-1 in average precipitation year could receive the maximum grain yield and water use efficiency. Both 75 kgN·ha^-1 and 225kgN·ha^-1 could receive higher precipitation recharge rate than other treatments. 225 kgN·ha^-1 was regarded as the optimum nitrogen application for high and stable winter wheat grain yield in rain-fed farmland of the Loess Plateau.
出处
《生态经济》
CSSCI
北大核心
2009年第11期107-110,119,共5页
Ecological Economy
基金
国家重点基础研究发展计划项目(2005CB121103)
