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[1]MENG Jijun,WANG Jiangwei,YOU Nanshan,et al.Spatiotemporal Differentiation of Water Allocation Efficiency in Oasis Irrigated Areas in the Middle Reaches of the Heihe River[J].Research of Soil and Water Conservation,2017,24(01):173-180.

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Spatiotemporal Differentiation of Water Allocation Efficiency in Oasis Irrigated Areas in the Middle Reaches of the Heihe River

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 24 Number of periods: 2017 01 Page number: 173-180 Column: Public date: 2017-02-28

Title:: Spatiotemporal Differentiation of Water Allocation Efficiency in Oasis Irrigated Areas in the Middle Reaches of the Heihe River

Author(s):: MENG Jijun, WANG Jiangwei, YOU Nanshan, WANG Ya, ZHOU Zhen; Laboratory for Earth Surface Processes, Ministry of Education, School of Urban and Environmental Sciences, Peking University, Beijing 100871, China

Keywords:: water allocation efficiency; oasis irrigated area; spatiotemporal differentiation; data envelopment analysis (DEA); the middle reaches of the Heihe River.

CLC:: S274

DOI:: -

Abstract:: The improvement of water use efficiency on oasis agriculture is the key process in coordination economic development and ecological construction in the arid zones. We focused on the 24 oasis irrigated areas in the middle reaches of the Heihe River. Based on the basic geographic information data, the land cover data and statistic data in oasis irrigated areas, we analyze the spatiotemporal differentiation of water allocation efficiency in the oasis agriculture, and probes into the main factors limiting the water allocation efficiency in each oasis irrigated area. The main conclusions are as follows: (1) The water allocation efficiency in each oasis irrigated area has significant spatiotemporal differentiation. The water allocation efficiency in Pingchuan, Luocheng, Daduma, Yingke, Banqiao, Liaoquan, Liyuanhe, Liuba, etc., is relatively higher; but in the irrigated areas such as Mayinghe, Laojun, Hongshuihe, Tongzibahe, Xijun, Shangsan, Anyang, Ya’nuan, Xinba, it is relatively lower. Water allocation efficiency increases from 0.797 in 2008 to 0.848 in 2012, spatial differentiation has narrowed. (2) Too many water allocation elements have been put into the oasis irrigated area universally, water conservancy facilities and water diversion density exceed the actual demand in irrigated areas; specifically, in the Shandan County and the Minle County, water diversion density is oversize, but in the Ganzhou County and Gaotai County, main canal density and branch and lateral canal density obviously exceed the demand. (3) The optimal solution of DEA shows that irrigation channel density is universally saturated in a part of irrigated areas, water diversion density is oversize, in the most areas, it should be reduced by 34.8% comparing with the best input-output efficiency. Therefore, allocating limited water resources in the irrigated areas reasonably, popularizing water saving projects and measures industriously are the main methods to improve oasis water use efficiency.

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