Ecological water requirement for natural grassland vegetation in the Sunan Yugur Autonomous County
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Abstract:
Estimation of ecological water requirement for natural grassland can provide reference for regional grassland ecological construction planning and water resources allocation,in order to solve the regional water shortage problems.The methods of estimating ecological water requirement for non-pristine and non-full coverage natural vegetation were proposed by FAO.The Sunan Yugu Autonomous County in the typical western pastoral areas was chosen as a case study in this paper.The reference crop evapotranspiration of vegetation in the regional and its trend in the crop growing season from March to October were computed.The characteristics of the relationship between effective precipitation and ecological water requirement quota for different grassland types were also investigated.It is found that the Sunan County had a shortage of ecological water requirement at all different hydrological years,while comparing demands and supply.The situation is more serious in the Minghua,implying its fragile ecological environment.The regional development planning should be adjusted to ensure the harmony and stability of grassland ecosystems.
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