Changes in crop water consumption in Xinjiang of China from 1989 to 2018: A Logarithmic Mean Divisia Index decomposition analysis

Xinjiang, located in Northwestern China, is the important production base of various crops with high water consumption. The quantitative contribution of driving factors to crop water consumption has not been investigated in Xinjiang. In this study, the Logarithmic Mean Divisia Index method is used to quantitatively analyze the effect of five factors (population, planting structure, agricultural economics, water intensity, and industrial structure) to crop water consumption during 1989-2018. The results show that 1) crop water consumption has increased from 10.363 to 37.226 billion m(3) with a rate of 0.932 billion m(3)/a in 1989-2018. Its increased trend can be divided into two stages: a slow increase at a rate of 0.425 million m(3)/a in 1989-2003 and a quick expansion at a rate of 1.310 million m(3)/a in 2004-2018. 2) The increase of population and agricultural economics both promote crop water consumption, whereas changes in planting structure and water intensity both inhibit crop water consumption. Their contributions are 0.213, 2.068, -0.007, and -0.134 billion m(3), respectively. The increased agricultural economics and the decreased water intensity more significantly changed crop water consumption in 2004-2018 than in 1989-2003. 3) The total effects of five factors on crops varied at each stage. All crops (except wheat) have a promoting effect on an increase in crop water consumption with the largest value in cotton (0.378 million m(3)) in 1989-2003. The effect of the five factors on crops (except soybean and medicago) is positive (1.404 million m(3)), and the highest value is shown in cotton during 2004-2018. The results illustrate the contribution of the five factors of crop water consumption and provide references for local agricultural water saving in Xinjiang.