影响青海1号老芒麦产量的气候因子分析

Analysis of the Key Climate Factors on the Yield of Qinghai Elymus sibiricus L.

[目的]为了明确影响青海老芒麦产量的关键气候因子,为青海老芒麦的大面积推广和应用提供理论依据。[方法]通过2000～2004年的田间试验,在抽穗至开花期测定2龄牧草的产量,通过点聚图与线性回归法分析青海老芒麦草产量与3个气候因子(降水、日照和温度)的相关性。[结果]在3个气候因子中,降水的变化趋势与青海老芒麦产量的变化趋势较为一致,呈极显著正相关(r=0.96),而日照和温度的变化对青海老芒麦产量的影响不显著。各月降水量的变异系数远高于气温和日照,说明与其它气候因子相比,降水是很不稳定的气候因子。降水量和牧草产量之间的回归方程为:Y=20792+3401.4 x。[结论]降水是影响青海老芒麦牧草产量的关键气候因子。

[Objective] The aim of the research was to confirm the key climate factors that affected the yield of Qinghai Elymus sibiricus L. so as to provide the theoretical basis for the spread and application of Qinghai E. sibiricus in great area. [Method] Based on the field experiments in 2000-2004, the yield of 2-year-old herbage was determined from the heading stage to the flowering stage and the relativities between the yield and 3 climate factors （ including precipitation, sunlight and temperature） were analyzed by scatter diagram and linear regression method. [Result] Among 3 climate factors, the change trend of precipitation was in accordance with that of the yield of Qinghai E. sibiricus, showing extremely significantly positive correlation （r=0.96）. While the changes of sunlight and temperature had no significant effect on the yield of Qinghai E. sibiricus, The variance coefficients of precipitation amount among all months were much higher than those of sunlight and temperature, which indicated that precipitation was a more unstable climate factor compared with other climate factors. The regression equation between precipitation and herbage yield was Y=20 792＋3 401.4 x. [Conclusion] Precipitation was the key climate factor that affected the herbage yield of Qinghai Siberian Wildrye.