JOURNAL OF NATURAL RESOURCES ›› 2016, Vol. 31 ›› Issue (5): 822-832.doi: 10.11849/zrzyxb.20150033

• Resource Evaluation • Previous Articles     Next Articles

Study on the Planting Industry Structure Adjustment and Its Impact on the Water Demand of Crops in Minqin Oasis

ZHOU Jun-jü1, SHI Pei-ji1, LEI Li2, CAO Jian-jun1, WEI Wei1, ZHANG Li-li1   

  1. 1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China;
    2. Management Bureau of Shiyang River Basin, Gansu Provincial Water Resources Bureau, Wuwei 733000, China
  • Received:2015-01-12 Revised:2015-12-25 Online:2016-05-20 Published:2016-05-19
  • Supported by:
    National Natural Science Foundation of China, No.41461109 and 41261104; Young Teachers Scientific Research Ability Promotion Fund of Northwest Normal University, No.NWNU-LKQN-12-18; National Social Science Foundation of China, No.12CTJ001

Abstract: Oasis agriculture is not only the leading industry, but also the main water-consumption industry in the Minqin Oasis. The large water consumption of farming is the chief cause of intensifying contradiction between water supply and water demand and continuous deterioration of ecological environment. The optimization of agricultural structure, especially the cropping structure, is the key of sustainable development of agriculture in the Minqin Oasis. In this paper, the impact of cropping structure adjustment on the water demand of crops in the Minqin Oasis in recent 33 years was analyzed by using the theory of virtual water and the water demand models. Three conclusions are drawn. Firstly, the planting industry structure has been experienced great changes. The areal ratio of food crops, economic crops and other crops to the total planting area was readjusted from 84∶12∶4 in 1978 to 25∶72∶3 in 2010. Due to the rapid decreasing of wheat area, the proportion of food crops decreased, while the proportion of cotton, oil crops, cucurbits, fruits and vegetables area increased during this period. Secondly, the water demand of crops increased from 2.15×108 m3 in 1978 to 2.49×108 m3 in 2010. The water demand ratio of food crops to economic crops changed from 88∶12 in 1978 to 31∶69 in 2010. Thirdly, the ecological water-saving effect of planting structures adjustment at different times in Minqin was different. From 1979 to 1998, there was no water-saving effect; during 1999-2008, planting structure adjustment showed obvious water-saving effect; during 2009-2010, there was no water-saving effect due to the increasing water demand caused by further adjustment of planting structure. The total proportion of five kinds of high water demand crops played a decisive role in the water-saving effect. These results would provide scientific basis for the cropping structure adjustment and the rational utilization of water and soil resources in the Minqin Oasis.

Key words: Minqin Oasis, planting industry structure adjustment, virtual water theory, water demand of crops

CLC Number: 

  • F323.213