论文部分内容阅读
通过对陕西省关中及延安地区５８个县（区）的１４个降水因子和小麦产量进行相关和多元逐步回归分析，结果表明：就秦岭以北、榆林地区以南的降雨场而言，小麦生育期间的各月降水，除２月份以外，均与小麦产量成显著正相关；而休闲期间的６，７，８三月降水与小麦产量成显著负相关。得到了由１月、４月、８月降水和干燥度４个降水因子与小麦产量构成的最优回归模型。最后揭示了降水并不是在延安北部、关中东部和西部旱塬及秦岭北坡沿线各地小麦增产的限制因子，而在关中中部及延安南部，降水增产作用得到一定程度的发挥。
Through the correlation and multiple stepwise regression analysis of 14 precipitation factors and wheat yield in 58 counties (districts) of Guanzhong and Yan’an in Shaanxi Province, the results showed that in terms of the rainfall field north of Qinling and south of Yulin, the growth of wheat Precipitation during each month was significantly and positively correlated with wheat yield except February, while there was a significant negative correlation between precipitation and wheat yield during the leisure time in March, July and August. The optimal regression model composed of four precipitation factors and wheat yield in January, April and August was obtained. Finally, it reveals that precipitation is not the limiting factor for increasing wheat yield in the northern part of Yan’an, the dry-land in the eastern and western Guanzhong and the northern slope of the Qinling Mountains. However, rainfall enhancement and yield increase have been exerted to a certain extent in central Guanzhong and southern Yan’an.