高原春青稞株成穗数与气象条件关系

Relationship between mature spike number of highland barley and climatic factors

运用统计学原理与计算方法系统分析研究西藏自治区山南地区多年气候因子对青稞株成穗数的影响规律,建立了株成穗数-气候模型。试验结果表明,青稞三叶～分蘖期降水偏多有利于株成穗数的增加;分蘖～拔节期气温高、降水少,对增加株成穗数极为不利;拔节～抽穗期水热条件配合的好坏,直接影响株成穗数的大小。近35年分蘖～拔节期平均气温呈上升趋势,降水呈减少趋势,气候变暖、变干均不利于青稞株成穗数的增加。

Using the principles of statistics and analysis meathod,effects of climatic factors on mature spike num-ber of highland barley in Tibet are analyzed. The mature spike number-climate model of highland barley is per-formed. The results from tests show that,from three-leaf to tillering stages, more raining are favor of improving mature spike number. From tillering to jointing,the disadvantageous factors for mature spike number are high temperature and partly raining. The temperature and precipitation condition affect mature spike number from joint-ing to heading. In recent 35 years, climatic warming and rainfall decreasing occurred in tillering to jointing stages, but that are disadvantageous conditions of increasing mature spike number.