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Sustainability 2015, 7(5), 6069-6085; doi:10.3390/su7056069

The Temporal and Spatial Evolution of Water Yield in Dali County

1,* , 1,†
,
2,†
,
3
,
1
and
1
1
Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China
2
College of Urban & Environmental Sciences, Central China Normal University, Wuhan 430079, China
3
School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editors: Xiangzheng Deng and Ram Babu Singh
Received: 30 November 2014 / Revised: 21 April 2015 / Accepted: 22 April 2015 / Published: 18 May 2015
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Abstract

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. View Full-Text
Keywords: water yield; spatial variation; relative capacity; sensitivity water yield; spatial variation; relative capacity; sensitivity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yu, J.; Yuan, Y.; Nie, Y.; Ma, E.; Li, H.; Geng, X. The Temporal and Spatial Evolution of Water Yield in Dali County. Sustainability 2015, 7, 6069-6085.

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