Dynamic Evaluation of Forest Eco-system Services in Guangdong Province
广东省1987年至2004年森林生态系统服务功能价值动态评估

It is very important to be aware of the considerable influences of the high speed economy development and fast urbanization on the ecosystems structure, landscape patterns and service functions degeneration of the forest system in Guangdong Province since the reform and opening-up, especially after 1987. Evaluation of forest ecosystem service function in Guangdong is conducted on the basis of forest conditions of each stage. It can provide foundations for integrating economic performance and ecosystem performance harmoniously, and for the compensation to the forest ecological value and for scientific operation and sustainable use of forest resources in Guangdong. Material quantity and value quantity are combined to evaluate the forest ecosystem system service function in Guangdong. To compare with other nations and regions easily, the unit value of ecosystem system function put forward by Costanza et al(1997) is employed. According to forest inventory materials in Guangdong province, forest ecosystem service function values in 1987, 1996 and 2004 are calculated respectively, which mainly include economic function and ecosystem function (self-restraint, headwaters, prevention from soil erosion and improvment of soil, atmosphere decontamination and landscape recreation function). The results indicate that the total value of forest ecosystem services in Guangdong Province are approximately 19.988×109(RMB)(1987), 22.625×109(RMB)(1996) and 23.681×109(RMB)(2004) respectively. The proportions of ecosystem function value in the total function value are 83.7%(1987), 85.8%(1996) and 86.0%(2004) respectively, while comparison of economic function value are 16.3%(1987), 14.2%(1996) and 14.0%(2004). So the specific weights of ecological and economic value of forest ecosystem services in Guangdong Province are 5.1:1(1987), 6.1:1 (1996), 6.2:1(2004). In addition, total value of forest ecosystem services in Guangdong Province keeps growing in the 20 years, and the weight of ecological value rises gradually, while the weight of economic function value declines gradually. Compared with other nations and region, the level of forest ecosystem function in Guangdong is similar to that of Heilongjiang, Hunan, the southeast of Guizhou and Hainan. However, there it still lags behind the dry regions in northwest China, Yunnan Province and some other nations, such as Japan and the US. It can be concluede that forest ecosystem function and economic function are inseparable from natural condition and social economic condition of each region.