基于二类调查数据的延庆县森林资源生态效益分析

以北京市延庆县为研究对象,利用1999年和2004年两期森林资源二类调查数据,对区域内的森林资源在水源涵养、土壤保育、固碳效益和空气净化等方面的生态效益进行了实物量计算及时空动态分析。结果显示:1999—2004年延庆县森林资源生态效益明显,且有大规模的提升,减少地表径流量、减少土壤侵蚀量、生物量、二氧化硫吸收量和粉尘抑制量增幅分别达到24.11%,19.37%,10.06%,30.77%和33.79%;空间分布更加均衡,作用范围进一步扩大。

Analysis and Evaluation of Forest Ecological Benefits Based on Forest Management Inventory Data for Yanqing County

An experiment was conducted to analyze and evaluate the spatial-temporal dynamic changes of forest ecological benefits in water conservation,soil conservation,carbon fixation and air purification in Yanqing county of Beijing based on forest management inventory data of 1999 and 2004.The results showed that this area achieved remarkable ecological benefits with a large increase during the 5 years.The increase of runoff,soil erosion decrement,biomass,SO2 absorption and dust suppression reached 24.11%,19.37%,10.06%,30.77% and 33.79% respectively.Meanwhile the spatial distribution also became more balanced with the scope being extended.