论文部分内容阅读
在甘肃榆中地区同一生境下,研究了采自甘南不同海拔高度(2 500、3 000、3 500和4 000m)垂穗披碱草(Elymus nutans)种植第2年的种子产量及其构成因素。结果表明,4个种群内的变异系数均为单株种子产量、单株干重和单株生殖枝数较大,表明种群内选择育种的潜力大,其次是千粒重和收获指数,每生殖枝小穗数与每小穗种子数的变异系数最小。海拔对种子产量及其构成因素也有显著影响,表现为海拔4 000m种群单株种子产量显著低于其它种群(P<0.05),为14.58g·株-1,海拔3 500m种群单株种子产量最高,为23.77g·株-1,但与海拔3 000和2 500m没有显著差异。4个海拔的种子产量与其构成因素的相关性不完全一致,除千粒重、每生殖枝小穗数和收获指数外,各因素与产量间均为正相关或显著正相关,相关系数表现为单株干重>每株生殖枝数>每小穗种子数。
In the same habitat of Yuzhong, Gansu, the seed production and its components in the second year of Elymus nutans growing at different altitudes (2 500, 3 000, 3 500 and 4 000 m) . The results showed that the coefficient of variation in the four populations were single seed yield, dry weight per plant and reproductive branch per plant larger, indicating the potential of breeding selection within the population, followed by the 1000-grain weight and harvest index, each small reproductive branch The coefficient of variation of spikes per spikelet was the smallest. Elevation had a significant effect on seed yield and its composition. The results showed that the seed yield per plant at 4 000 m altitude was significantly lower than that of other populations (P <0.05), which was 14.58 g · cm -1. The highest seed yield per plant was 3 500 m , Which was 23.77 g · plant -1, but no significant difference with 3 000 and 2 500 m above sea level. The correlation between seed yield and its components at four altitudes was not completely consistent. Except for 1000-grain weight, spikelets per plant and harvest index, there was a positive or significant positive correlation between the factors and the yield, and the correlation coefficient was single Dry weight> Number of reproductive branches per plant> Number of seeds per spikelet.