森林生态系统服务价值的遥感估算——以杭州市余杭区为例

Remote sensing estimation of forest ecosystem services-a case study of Yuhang district in Hangzhou

森林生态系统作为陆地生态系统的主体,其服务功能价值的评估对于整个地球的生态系统都具有重要的现实意义。遥感技术的发展,为研究森林生态系统服务价值提供了有力的手段和支持。本文采用了以CASA模型为基础的光能利用率模型,基于MODIS数据,估算了2005年杭州市余杭区森林的净第一性生产力(NPP),并计算得出研究区森林生态系统六项服务功能的总价值为13.8467亿元,其中直接经济价值和间接经济价值分别为2.5215亿元和11.3252亿元,各项服务功能价值的贡献大小顺序依次为:固碳释氧>涵养水源>有机物质生产>营养物质循环>水土保持>净化作用。本文旨在探讨一个进行森林生态系统服务功能估算与评价的方法,为区域生态系统的和谐发展提供理论依据和数据支持。

As the main body of terrestrial ecosystem, forest plays an important role in the whole global ecosystem. Using the lightuse efficiency model and based on the CASA model and MODIS data, we evaluate the net primary productivity （NPP） of forest of Yuhang district in Hangzhou city, Zhejiang Province. The result of this paper shows that the total value of the six forest ecosystem services in Yuhang district is 1. 38467 billion yuan in 2005 and the indirect economic value is as 4. 5 times as the direct economic value. Among the contribution of value of all ecosystem services, the descending order is ： C fixation and 02 release, water storage, organic matter production, nutrients cycle, soil conservation, and air puricication. The aim of this paper is to discuss a method to the research on forest ecosystem services evaluation and provide the scientific theory support and data basis for the policy of sustainable development and the protection of environment.