【摘要】 利用青海省粮食主产区海东地区及其5 个代表县的粮食产量和逐月降水资料,分析了青海省干旱气候生态因素对粮食产量的影响。研究表明,青海春季降水量的多寡决定了粮食气象产量的高低和农业年景的好坏。春末夏初的5 月、6 月降水量对粮食产量的影响最明显。粮食产量波动主要受4 月～6 月降水量6 年左右的周期波动的影响。更多还原

【Abstract】 The grain yields of five representative counties and the amount of each month precipitation at main grain production region in Haidong of Qinghai Province, the effect of drought climatic factors in Qinghai Province on grain yields were analysed. The result shew that the upper or lower grain yields and the good or bad year’s harvest of agriculturel was determined more or less by amount of precipitation in spring. The precipitation during May～June obviously affected the grain yields, while the grain yield fluctuation was mainly affected by the about 6 year periodic fluctuation of the precipitation during April～June.更多还原