岩溶地区水资源-环境系统服务功能评价修正——以贵州省为例

Service Function Assessment Correction of Water Resources Environment System in Karst Area:a Case Study of Guizhou Province

常规水资源-环境系统服务功能评价系数既不能反映"二元三维"水文地质状况,也忽略了水环境状况对服务功能的影响,导致评价结果与实际存在较大偏差。故结合岩溶发育强度和水环境特征确定服务功能价值修正系数,并对贵州省的服务功能评价结果进行修正。结果表明:(1)贵州省水资源-环境系统服务功能以水文调蓄与水力航运、环境调节与净化为主,两者价值量分别为789.22×10~8元和742.66×10~8元,两者共占全省价值总量的69.48%;(2)水资源-环境系统的服务功能价值量主要取决于区域对水资源量的供需条件、水域面积及水域旅游景观开发,且区域对水资源-环境系统的利用率越高,则价值量就越大,其最大值为贵阳市,达292.65×10~8元,最小值为毕节市,仅74.35×10~8元;(3)修正系数分为水量型、水质型和复合型,其平均值分别为0.81、0.86和0.84,与各地州水循环特征、水环境质量基本吻合。上述表明,利用岩溶发育强度和水环境因子为依据的修正系数对评价结果进行修正,不仅突显出岩溶发育特征对水资源-环境系统服务功能的影响,也使评价结果更加符合实际水生态环境状况。

Since the conventional evaluation coefficients of water resources environment system service function could neither reflect the ‘Binary-3 D＇hydrogeology condition,nor indicate the influence of water environment on its service function,leading to a great deviation of evaluation result from reality. This paper combined the water environment with the karst development intensity to determine the correction coefficients in karst area. Then,the service function value for each city or prefecture was modified. The results showed that：① The main service function of water resources environment system in Guizhou province was ‘hydrologic storage regulation and navigation＇ and ‘environmental regulation purification ＇, valued 789. 22 × 10^8 and 742. 66 × 10^8 yuan respectively,both of which account for 69. 48% of the total value of the province.② the value of water resources environment system service function mainly depends on the supply demand conditions of water resources,water area and the development of water tourism landscape. Moreover,the higher the utilization rate of regional water resources environment system is,the greater the value of water resources environmental system service function will be. The city of Guiyang possesses the maximum value of 292. 65 × 10^8 yuan,while the city of Bijie displays the minimum value of only 74. 35 × 10^8 yuan.③ the correction coefficients were divided into water volume type,water quality type and mixed type,and the average values of these types were 0. 81,0. 86 and0. 84 respectively,which were generally consistent with the characteristics of water cycle and water quality in different cities or prefectures. The above results indicated that the utilization of correction coefficients derived from development intensity and water environment to correct the evaluation results could not only highlight the influence of karst development characteristics on water resources and environment system service function,but also make the evaluation results more congruent with the real water ecological environment.