疏勒河中游绿洲天然植被生态需水量估算与预测研究

Abstract

Abstract: The vegetation ecological water requirement has become an essential reference for making reasonable allocation and management of water resources and guiding the ecological construction and vegetation restoration in arid regions. The oasis in middle reaches of Shule River Basin,which is the society,economy and human activity central zone of Shule River Basin,is facing serious ecological and environmental problems and water crisis because of the effects of human activity and climate change. Ensuring the ecological water use is the fundamental measure for protecting the environment. Based on the above-mentioned problems,this paper is aimed at calculating the ecological water requirement of natural vegetation at present and in the future,and provides references for rational allocation of water resource and eco-environmental protection in the study area. Based on the statistical analyses method,remote sensing and GIS technology,and applying the typical phreatic water evaporation model (veriyanov),this paper examined the change in coverage of land use and vegetation coverage in the middle reaches oasis of Shule River Basin,calculated the natural vegetation ecological water requirements of each county,and made prediction of the ecological water requirement in the future according to the key management program of Dunhuang water resources reasonable utilization and ecological protection. The results showed that the ecological water requirement of oasis natural vegetation in the middle reaches of Shule River Basin ranged from 18 768.97× 10⁴ m³ to 46 643.04×10⁴ m³. Therein,the ecological water requirement of natural forest land was from 1 187.71× 10⁴ to 2 898.72×10⁴ m³,and natural grassland was from 17 581.27×10⁴ to 43 744.32×10⁴ m³ in 2013. Ecological water requirement of natural vegetation of Guazhou County,Yumen City,and Dunhuang City in 2013 ranged from 9 685.06×10⁴ to 23 392.09×10⁴ m³,6 552.11×10⁴ to 17 133.45×10⁴ m³,and 2 531.80×10⁴ to 6 117.50×10⁴ m³, respectively. It was predicted that the ecological water requirement of natural vegetation in the oasis of middle reaches of Shule River Basin in 2020 would range from 20 655.96×10⁴ to 66 614.75×10⁴ m³,and from 1 316.57×10⁴ to 3 855.91×10⁴ m³ of natural forest land,from 19 339.39×10⁴ to 62 758.84×10⁴ m³ of natural grassland. The ecological water requirement would range from 22 721.55×10⁴ to 85 584.09×10⁴ m³ in 2030,and from 1 448.22×10⁴ to 4 970.08×10⁴ m³ of natural forest land,from 21 273.33×10⁴ to 80 614.01×10⁴ m³ of natural grassland. The results have important referential significance to promote research on ecological water right,allocation of water quantity,ecological protection,reasonable configuration of water resources and coordinated and sustainable development of eco-society in Shule River Basin. Under the influence of human activities,the study of vegetation water requirement law in different ecological function areas,regional ecological water demand and the threshold should be further strengthened in the future in arid inland river basin.

Key words: the middle reaches of Shule River Basin, oasis, natural vegetation, ecological water requirement

CLC Number:

TV213.4

SUN Dong-yuan, HU Xiang-quan, JIN Yan-zhao, ZHANG Yun-liang, LI Yuan-hong. Prediction and evaluation of ecological water requirement of natural vegetation in the middle reaches oasis of Shulehe River Basin[J]., 2016, 39(1): 154-161.

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Prediction and evaluation of ecological water requirement of natural vegetation in the middle reaches oasis of Shulehe River Basin

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