一、问题的提出黑龙港地区位于河北省的东南部,是黄淮海平原中最干旱的地区,年降水量500—600毫米,比南北邻近地区为少,常形成春旱夏涝的气候特点,加之降水的年际间变化较大,旱涝灾害比较频繁。本地区地表水和地下水也比较缺乏,到目前为止,旱地面积约占总耕地面积的60％左右。粮食产量很 First, the issue put forward Heilonggang region is located in southeastern Hebei Province, is the Huang-Huai-Hai Plain in the most arid region, the annual rainfall of 500-600 mm, less than the northern and southern regions, often form the spring drought summer flood climate characteristics, Coupled with large changes in precipitation over the years, drought and flood disasters more frequently. The surface water and groundwater in this area are also relatively scarce. So far, the dry land area accounts for about 60% of the total cultivated land area. Food production is very