不同海拔夏播小麦产量和生育性状的研究

Studies of Grain Yield and Growth-Development Traits of Summer-Sowing Wheat at Different Elevation

本试验对不同海拔高度夏播小麦的研究结果表明,夏播小麦的籽粒产量和生育性状以海拔1600m表现最好。在海拔1000～1600m的范围内,产量和生育性状随海拔升高而改善,海拔高于1600m以后各性状表现呈下降趋势。产量和生育性状跟海拔高度的关系用二次曲线Y=a+bx+cx^2均拟合良好。进一步分析表明,生态因素是影响不同海拔夏播小麦生育性状和籽粒产量的限制因子;在诸生态因子中起主导作用的是温度。在低海拔条件下生育性状不良和产量下降,主要是前期高温对生长的抑制和对生育进程的促进造成的。因此,在冀西北海拔1200m以上的高寒山地,适宜大面积种植夏播小麦。

In this paper, we have approached the grain yield and growth-development traits of summer-sowing wheat at five elevations ( 1 000, 1200, 1400, 1600, 1800m).The results indicated that the grain yield and growth-deveopment traits were improved with the increasing of elevation from 1 000m to] 600m .But, over 1600m, each traits was inclined to decreasing .The relation between yield and growth-development traits and elevation can be expressed by the curve of porapola Y=a + bx + cx2. The further analysis showed that the ecological factors were the main elements influencing the grain yield and growth-development traits of summer-sowing wheat at different elevation.Among these factors, the temperature was in the leading position.