宁南半干旱地区不同立地农田水分恢复评价

The Evaluation on Cropland Water Recovery in Different Topography in Southern Ningxia Semi-Arid Area

长期测定得到，宁南半干旱地区的农田土壤水分都能得到全面恢复或基本恢复，可恢复到当地田间持水量的８０％～１００％，以豌豆地恢复最好，马铃薯地较差。为年周期水分恢复类型区；剖面土壤水分，一般都在０～２ｍ土层内得到全面和基本恢复；土壤水分恢复时间在雨季，即７～１０月，山地比源地提前一个月，源地比川台地提前半个月，马铃薯、谷糜、胡麻比其它作物地提前近一个月。按照水分恢复情况要作好秋墒保护工作。

Through long period experiments in Southern Ningxia, the paper gave the results that cropland soil moisture could be recovered or mainly recovered ate 80%￣100% of FC lever. The best recovered is pealand, and the last is potato land. So the area was classed as the yearly water recovery region. Its 0￣2m depth soil could be mainly or completely compensated. The recovery begin at july and end at october with the tendency; slop land's completed a month earlier than table land, tableland's finished half a month earlier than table land; Soil water of potatoland, proso or flaxland would be recovered a month earlier than other corpland. Then we could do beffer in Soil Water keeping according to the water recovery condition.