不同生长年限对青海草地早熟禾生长特性和种子产量及其构成因子的影响

Effects of Different Growth Years on Growth Characteristic,Seed Yield and Yield Components Factors of P.pratensis L.cv.Qinghai

探讨了不同生长年限对青海草地早熟禾人工草地生长特性和种子产量及构成因子的影响,为青海草地早熟禾种子生产提供理论依据。结果发现,随着人工草地生长年限的延长,生殖枝高度、营养枝高度以及花序长度总体上都呈降低的趋势。不同的生长年限对青海草地早熟禾种子产量及其构成因子的影响表现在:2龄人工草地的种子产量最高,达到496.96kg/hm2,是最低产量(10龄草地:96.64kg/hm2)的5.1倍;明显的性状变化是单位面积生殖枝数、小穗数/生殖枝和种子粒数/小穗,且随着生长年限的延长,三者都逐渐下降。

Effects of different growth years on growth characteristic,seed yield and yield component factors of P.pratensis L.cv.Qinghai were studied to provide theory basis for P.pratensis L.cv.Qinghai seed production.The results indicated that the fertile tillers height,the sterile tillers height and the inflorescence length of P.pratensis L.cv.Qinghai would gradually decreased with passage of planning time of artificial grassland.The effect of different growth years on seed yield and yield component factors of P.pratensis L.cv.Qinghai were showed that the seed yield in 2-year-old cultivated grassland was highest,reaching 496.96kg/hm^2,and was the lowest yield（in 10-year-old grassland was 96.64kg/hm^2）5.1 times;significant character change was that the nurnber of fertile tillers per unit area,spike/fertile tillers and seed grains/spikelet decreased with the passage of growth years of artificial grassland.