渭北旱塬影响小麦产量的关键降水因子分析  

Study on Key Water Factors of Affecting Wheat Yield in Weibei Dry Highland

作　　者：党廷辉[1] 高长青[2] 

机构地区：[1]中国科学院水利部水土保持研究所 [2]长武县农技推广中心,陕西长武713600

出　　处：《水土保持研究》2003年第1期9-11,36,共4页Research of Soil and Water Conservation

基　　金：中国科学院知识创新工程项目 (KZCX2 -4 13 -5 );国家科技攻关项目 (2 0 0 1BA5 0 8B18)资助

摘　　要：水分是旱塬区作物产量的主要限制因子。不同小麦生长时段的雨量大小和分布对小麦产量的作用存在很大差异。通过双重筛选逐步回归方法 ,对不同施肥处理小麦产量与生育时段降水分析表明 ,小麦播前休闲期 7、8、9三个月降水在决定来年冬小麦产量方面起关键作用 ,同时越冬期 11月、1月、2月降水对小麦产量也有十分重要的影响。从统计学上认为上述关键期降水决定来年小麦产量 ,并不否认其它时段降水对小麦的重要性 。Water is a main limited factor to crop yield in dry highland of Loess Plateau.The effects of rainfall amount and distribution in stages of winter wheat growing to crop yield show great differences. After analyzing the relationship between wheat yield of various treatments and rainfall of wheat growth stages with the means of the Double Screening Stepwise Regression, it was found that the rainfall in fallow time (July, August and September) of pre planting wheat plays a key role on wheat yield in coming year, and the rainfall in winter (November,January and February) has important impact in wheat yield as well.Above the key stages, rainfall is considered very important to wheat yield in coming year, without denying the importance of the other stages' rainfall to wheat. Only was it known that the rainfall in other stages may meet crop's necessities.

关 键 词：小麦 关键期降水 渭北旱塬 

分 类 号：S512.11[农业科学—作物学] S273.4