安塞黄土丘陵区人工草地水分有效利用研究

Study on Water Use Efficiency of the Artificial Grassland at Ansai County in the Loess Hilly Region

１９９２～１９９５年，在安塞黄土丘陵区对种植的优良牧草沙打旺、紫花苜蓿、红豆草、白花草木樨和无芒雀麦进行了地上净初级生产量、蒸腾和土壤水分的测定。试验结果表明：通过建造人工草地，能更好地利用水资源，提高土地生产力，其水分利用效率是天然草地的２．２～７．１倍。为此我们认为，在黄土丘陵区，改变单一种植粮食的生产方式，在大面积坡地进行人工种草或草粮轮作，是提高该地区水分利用效率和土地生产力，形成草－畜－农结合，实现农业持续发展的主要措施．

This experiment was carried out at Ausal county in the loess hilly region from 1992 to 1995. Through measuring the net aboveground primary production, transpiration, soil moisture of the fine grasslands of Astragalus adsurgens, Medicago sativa,Onobrychis viciaefolia , Melilotus albus and Bromus inermis, the results showed that the water use efficiency(WUE) of artificial grasslands is 2.7-7.1 times of natural grassland. These artificial grasslands can use water resource better and improve land productivity. It is suggest that change the ways only for planting crops on the slope land in this region, establish artificial grasslands or crop/legume rotaion. These are main ways of improve WUE and agriculture-animal husbandry production as well as development sustainable in loess hilly region.