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在半干旱黄土区,水分是植物生态因子中的主导因子。植物水分消耗与土壤水分状况,是水分收支的重要方面,亦是水分循环的基础。1975—1979年陕西省吴旗县飞播沙打旺(Astragalus adsurgens)试验成功后,在北方推广面积逐渐扩大。在年降水量380毫米以上的半干旱黄土区,沙打旺飞播效果良好,表现出适应性强、抗旱、抗寒、保水、保土的特点。然而,在试验和推广中,
In the semi-arid loess area, water is the dominant factor in plant ecological factors. Plant water consumption and soil moisture status are important aspects of water balance and are also the basis for the water cycle. From 1975 to 1979, after the successful trial of Astragalus adsurgens in Wuqi County, Shaanxi Province, the popularization area in the north gradually expanded. In the semi-arid loess area with an annual rainfall of 380 mm, the aerial sowing of Spartina alternifarinosus has a good effect and shows the characteristics of strong adaptability, drought resistance, cold resistance, water retention and soil conservation. However, in testing and promotion,