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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.
Jing Yu; Yongwei Yuan; Yan Nie; Enjun Ma; Hongji Li; Xiaoli Geng. The Temporal and Spatial Evolution of Water Yield in Dali County. Sustainability 2015, 7, 6069 -6085.
AMA StyleJing Yu, Yongwei Yuan, Yan Nie, Enjun Ma, Hongji Li, Xiaoli Geng. The Temporal and Spatial Evolution of Water Yield in Dali County. Sustainability. 2015; 7 (5):6069-6085.
Chicago/Turabian StyleJing Yu; Yongwei Yuan; Yan Nie; Enjun Ma; Hongji Li; Xiaoli Geng. 2015. "The Temporal and Spatial Evolution of Water Yield in Dali County." Sustainability 7, no. 5: 6069-6085.
There has been very limited research on water use efficiency for soil conservation (WUE-SC) in typical water scarce regions such as the lower Heihe River Basin, where there is serious wind erosion and the soil conservation service plays a key role in guaranteeing the ecological safety of Northern China. The soil conservation service, which was represented by the soil conservation amount (SC), was first estimated with an experiment-based model in this study. Then, the WUE-SC (i.e., SC/ET) was calculated on the basis of evapotranspiration (ET) data, and management implications were finally discussed. The results indicated the WUE-SC ranged between 0–98.69 t mm−1, and it first decreased and then increased on the whole during 2000–2008. Besides, the inter-annual variation of WUE-SC was mainly due to change in the potential soil loss. In addition, the WUE-SC showed significant spatial heterogeneity, and the average WUE-SC of the whole study area was very low due to spatiotemporal inconsistency between the potential soil loss and the vegetation coverage rate. Although there are some uncertainties, these results still can provide local managers with valuable information for water resource utilization and ecosystem management to improve water use efficiency.
Haiming Yan; Jinyan Zhan; Bing Liu; Yongwei Yuan. Model Estimation of Water Use Efficiency for Soil Conservation in the Lower Heihe River Basin, Northwest China during 2000–2008. Sustainability 2014, 6, 6250 -6266.
AMA StyleHaiming Yan, Jinyan Zhan, Bing Liu, Yongwei Yuan. Model Estimation of Water Use Efficiency for Soil Conservation in the Lower Heihe River Basin, Northwest China during 2000–2008. Sustainability. 2014; 6 (9):6250-6266.
Chicago/Turabian StyleHaiming Yan; Jinyan Zhan; Bing Liu; Yongwei Yuan. 2014. "Model Estimation of Water Use Efficiency for Soil Conservation in the Lower Heihe River Basin, Northwest China during 2000–2008." Sustainability 6, no. 9: 6250-6266.