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

Li Daiqiong; Jing Jun; Laing Yimin; Liu Goubin; Huang Jin (Institute of Soil and Water Conservation, Chinese Academy of Sciences and Miinistry of Water Resources. Yangling. Shaanxo. 712100)  
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.
【CateGory Index】: S157.433
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