The Temporal and Spatial Evolution of Water Yield in Dali County

Sustainability

Jing Yu²  Yongwei Yuan²  Yan Nie¹  Enjun Ma⁴  Hongji Li²  Xiaoli Geng²  Xiangzheng Deng³ 

[1] College of Urban & Environmental Sciences, Central China Normal University, Wuhan 430079, China; E-Mail:;Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China; E-Mails:Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China;;School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, China; E-Mail:

关键词: water yield;    spatial variation;    relative capacity;    sensitivity;   

DOI  :  10.3390/su7056069

来源: mdpi

【 摘 要 】

Water yield is of great importance to the balance between supply and demand of water resources. The provision of freshwater for Dali is estimated and mapped in 1988, 1995, 2000, 2005 and 2008, using the Integrated Valuation of Environmental Services and Tradeoffs (InVEST) modeling toolset. The stability of water yield’s spatial variation is analyzed by a sorting method. The factors are explored which lead to the change in the relative water yield capacity. The yields at five points in time are compared, and the result of which shows a sharp fluctuation. The water yield curve is of a similar waveform as precipitation. An obvious and relatively stable spatial variation appears for water yield. The highest water yield areas are mainly located in the area where the elevation is high and both the elevation and the slope changes are large, and the main land uses are Shrub Land and High Coverage Grassland. The lowest areas are mainly in the eastern part of Erhai or the surrounding area. Precipitation, construction land expansion and the implementation of policy on land use are the three main factors which contribute to the change of the relative water yield capacity during 1988–2008 in Dali. In the study area, the water yield appears highly sensitive to the change in precipitation. The elasticity coefficient is calculated to illustrate the sensitivity of the water yield to the precipitation. When the elasticity index is larger, the risk of natural disaster will be higher.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.