Abstract
The object of this study was to answer a scientific question, i.e., how to determine the suitable scale of natural and artificial oases management based on water resource availability in an arid region. For this purpose, the Hotan River Basin was chosen as the study area, we analyzed the distribution characteristics of natural vegetation in the river basin using remote sensing images, water resources, weather, socioeconomic data, and field survey data. We also divided the natural vegetation into two ecological protection targets: the major and the basic protection zones. Suitable scales of oasis management were calculated under different inflow variations based on the above analysis. We had five major findings. (1) The total area of natural vegetation of the river basin is 4968.87 km2 with forestland, open forestland, high-covered grassland, and low-covered land accounting for 14.08, 14.98, 13.16, and 57.78 % of the total area, respectively. (2) In the middle reaches, the average vegetation distribution ranges for the west and east banks of the Yurunkax River are 5–8 and 34–51 km from the river, respectively. The average vegetation distribution ranges for the west and east banks of the Karakax River are 31–45 and 2–9 km from the river, respectively. In the lower reaches, the average vegetation distribution range is 3–10 km from the river. (3) During high-, normal-, and low-flow periods, the total available water for the river basin is 54.48 × 108, 42.67 × 108 and 34.00 × 108 m3, respectively. (4) The ecological water demand of the Hotan River is 8.85 × 108 m3, and the ecological water demands of the middle and lower reaches are 5.13 × 108 and 3.72 × 108 m3, respectively. (5) The optimal area for the natural oasis in the middle reaches is 3145–3293 km2. This study provides a theoretical basis for planning rational development of similar river basins in arid regions.
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Acknowledgments
This work was supported by the West Light Foundation of The Chinese Academy of Sciences (XBBS-2014-13), the Main Service Project of Characteristic Institute of Chinese Academy of Sciences (TSS-2015-014-FW-2-2), and the National Natural Science Foundation of China (41471099, 41171427, 31370551, and 31400466).
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This article is part of a Topical Collection in Environmental Earth Sciences on “Water in Central Asia,” guest edited by Daniel Karthe, Iskandar Abdullaev, Bazartseren Boldgiv, Dietrich Borchardt, Sergey Chalov, Jerker Jarsjö, Lanhai Li, and Jeff Nittrouer.
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Guo, H., Ling, H., Xu, H. et al. Study of suitable oasis scales based on water resource availability in an arid region of China: a case study of Hotan River Basin. Environ Earth Sci 75, 984 (2016). https://doi.org/10.1007/s12665-016-5772-5
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DOI: https://doi.org/10.1007/s12665-016-5772-5