Research of Equilibration on Water Resources utilization in Yunnan plateau by Gini Coefficient

Abstract Based on the investigated data from 2000 to 2015 that related to water resources utilization in 103 units about Water Resources Fourth Sub-Region divided by Drainage Basin overlying Prefecture (abbr. WRFSRDBP) in Yunnan Province that belongs to Yunnan – Guizhou plateau, Gini coefficient, Theil coefficient and Variation coefficient were adopt to evaluated equilibration on water resources utilization of the whole province. The results shows that the Gini coefficients about water resources utilization in the province was 0.105∼ 0.763, the average value was 0.544. Water supply quantity of reservoirs and ponds increased 3.033×109 m3 in recent 15 years, resulted in the Gini coefficient decreased from 0.327 to 0.256, namely the equilibration changed better; While the Gini coefficient of water supply quantity of projects by gravity channel, pump and trans-valley increased from 0.209 to 0.266, as new reservoir was built across river upstream, thus water supply amount was transferred to water supply amount of reservoir; Water supply by wells, rain collection and wastewater reused projects in different units changed various, the Gini coefficient of water supply by wells were 0.584∼0.614, and rain collection and wastewater reused projects were 0.611∼0.641 in the last 15 years, respectively. Non-cigarette industry developed rapidly, due to the restriction policy of state’s tobacco cultivate and cigarette plant, which promoted industrial structure changed from 2000. Those was the reason that the Gini coefficient of industrial water usages decreased from 0.542 to 0.329; Synchronously, the Gini coefficient of municipal water usage also decreased from 0.463 to 0.321, and the equilibration changed better too; On the other hand, the extent of water utilization different about livelihood and livestock in countryside was broaden, the Gini coefficient increased from 0.100 to 0.321; In recent 15 years, provincial irrigated rate of Yunnan was raised from 21.8% to 29.1%, the gap among sub-regions on agriculture irrigation development was reduced gradually, the Gini coefficient of irrigated water consumption decreased from 0.294 to 0.153 consequently. Ulteriorly, local entropy spatial distribution in the sub-regions revealed degree of importance of its water supply and water usage in the province. Besides, research by Theil coefficient and Variation coefficient also proved the same results.