西藏冬小麦成穗率与气候条件的关系

在系统分析研究西藏自治区山南地区多年气候因子对冬小麦成穗率的影响规律基础上，建立了成穗率气候模型。结果表明：山南地区冬小麦三叶一分蘖期间的平均气温偏高有利于成穗率的增加；分蘖一拔节期空气干燥将减少成穗率；孕穗一抽穗期的空气湿度为49％左右、日较差小、阴雨寡照有利于成穗率的提高。

Percentage of Ear Bearing Tiller of Winter Wheat and Its Relationship to Climate Factors in Tibet

Based on the analysis of effects of climatic factors on percentage of ear bearing tiller of winter wheat in Lhasa region, Tibet Autonomous Region, the models for the percentage of ear bearing tiller of winter wheat and climate were established. The higher mean temperature during three-leaf to tillering stage is beneficial to a increased percentage of ear bearing tiller; The dry air condition leads to a decreased percentage of ear bearing tiller during tilling to jointing stage; A relative humidity of 49%, less diurnal range, and overcast and rain induced lower intensity of radiation are associated with increased percentage of ear bearing tiller during booting to heading period.