儋州市退耕还林工程生态效益评价

[目的]对海南省儋州市退耕还林工程生态效益进行评价,为我国退耕还林工程生态效益评价提供依据。[方法]以截止2012年儋州市退耕还林工程取得的成绩为基础,对儋州市退耕还林工程林草植被的涵养水源、保育水土、固碳制氧、净化环境、改善小气候和保护生物多样性这6个方面效益进行评价,采用影子工程法、市场价格法进行物质量、价值量的测评,对该地区近9a来的退耕还林生态效益进行评价分析,结合恩格尔系数与皮尔曲线对评价结果进行修正。[结果]截止2012年,儋州市退耕还林工程生态效益总价值达22.18亿元,保护水资源价值最大,为17.64亿元,占生态总价值的79.5%;固碳制氧价值次之,为2.38亿元,占生态总价值的10.7%。[结论]儋州市退耕还林工程在水土保持中发挥极为重要的作用,有效地遏制了当地的水土流失。

Evaluation on Ecological Benefit of Returning Farmland to Forestland Projects in Danzhou City

[Objective] The ecological benefit of returning farmland to forestry projects in Danzhou City, Hainan Pvovince was to evaluated in order to provide a basis for eco-benefit assessment of returning farmland to forestland project in China. [Methods] Based on the achievements of returning farmland to forestland project in Danzhou City that finished in 2012, the following six aspects of the water conservation, soil and water conservation, carbon sequestration oxygen, purifying environment, improving the microclimate and protecting the biodiversity of Danzhou City project on returning farmland to forest vegetation were evaluated. The shadow engineering method and the market price method were used to carry on the physical and value assessment, analyze the forest ecological benefit of returning farmland in nearly nine years, and combine the Engel coefficient with the Pearson curve together to modify the evaluation results. [Results] By 2012, the ecological value of returning farmland to forestland project of Danzhou City was up to 2.22 billion yuan. The most important value is protection of water resources, 1.76 billion yuan, accounting for 79.5% of total ecological value. The following is carbon sequestration oxygen, 238 million yuan, accounting for 10.7% of total ecological value. [Conclusion] The ecological benefit brought by the implementation of returning farmland to forestland project of Danzhou City is very significant, and effectively control soil and water loss in Danzhou City.