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通过对宁南山区不同轮作方式的耗水量和水分利用效率的研究评价,结果发现:在当前生产水平下,各种作物收获后0～2m土层内都还存有一定数量的有效水分;粮豆轮作较春小麦连作具有较强的调节土壤水分的能力,对水的利用效率较高,适应于本区降水不均的气候条件、苜蓿耗水量大,能造成土壤深层水分枯竭,但随种植年限加长,耕作层的水分可得到恢复。研究表明,只要安排合理,在半干旱的宁南山区发展以苜蓿为主的草粮轮作制是可行的。
Based on the research on water consumption and water use efficiency of different rotation patterns in mountainous area of south Ningxia, the results showed that: at the current production level, a certain amount of effective water was still stored in 0 ~ 2m soil layers after various crops were harvested; Compared with the spring wheat continuous cropping, the rotation of the bean sprouts was stronger than that of the spring wheat, and its water use efficiency was high. It adapted to the climatic conditions of uneven rainfall in this area. The water consumption of alfalfa was large, which could cause the deep soil water depletion, Lengthened, tillable layer of water can be restored. The research shows that if the arrangement is reasonable, it is feasible to develop alfalfa-based grass and grain rotation in the semi-arid mountainous area of southern Ningxia.