摘要
通过分析北京大兴区近30年的降水资料,并按降水量划分为枯水年、平水年、湿润年和丰水年4种降水年型。利用旱棚模拟4种降水年型,研究其对玉米地上部生长、根冠比、产量和水分利用效率的影响。结果表明,平水年玉米的地上部长势较好,根冠比较高,产量较高,达9255kg/hm2,其水分利用效率也相对较高;丰水年由于肥料淋洗、根系发育不良对玉米高产不利。因此,平水年(夏玉米生育期内降水约400mm)实行旱作节水栽培,不会影响玉米产量,且可创造高产。
By analyzing the precipitation in the recent 30 years of Daxing district,Beijing,different patterns of annual precipitation(low pattern;moderate pattern;moist pattern;abundant pattern)were simulated by water shelter to study the impact of precipitation on overground growth,root shoot ratio,yield and water use efficiency of summer maize.Results showed that the overground growth,root shoot ratio and water use efficiency were relatively higher and grain yield of maize was relatively higher under moderate pattern of annual precipitation,with 9255kg/hm^2.By contrast,high pattern of annual precipitation was disadvantageous to high grain yield as a result of mal-developed roots and leaching losses of fertilizer.The yield of summer maize would not reduce under moderate pattern of annual precipitation(with 400mm of precipitation in the whole growth stage of summer maize)under rain-feed cultivation.
出处
《作物杂志》
CAS
CSCD
北大核心
2010年第4期73-76,共4页
Crops
基金
北京市科学技术委员会项目"雨养玉米节水科技示范推广工程"(Z08050503260803)
关键词
降水年型
玉米
水分利用效率
Annual patterns of precipitation
Maize
Water use efficiency