退耕区户用沼气的生态环境效益评价

为了评价退耕区户用沼气的生态环境效益,该研究依托陕西省退耕区户用沼气减排项目,根据森林生态服务功能评估规范提供的固碳释氧量计算方法、清洁发展机制(CDM,clean develop mechanism)执行理事会公布的方法AMS-III.R和国际通用的减排量计算方法,采用保护林地面积、温室气体减排量和二氧化硫减排量3个指标对退耕区6个乡镇2543户农村沼气工程生态环境效益进行了评价。结果表明:退耕区农村户用沼气池的建设不仅保护了林地,增加了森林的覆盖面积,而且减少了温室气体和空气污染物SO2的排放。项目实施后,年保护林地507.77hm2、减排温室气体7428.40t(以二氧化碳计)、减排SO21594.57kg。该研究可为农村可再生能源的发展及生态环境的评估提供参考。

Assessment of ecological environment benefit for household biogas in areas of returning farmland to forest

In order to evaluate ecological environment benefits of household biogas in land conversion area, based on the household biogas project in land conversion area of Shaanxi province, the methods of carbon fixation and oxygen release services of Specifications for Assessment of Forest Ecosystem Services in China, methodologies (AMS-III.R) proclaimed by Executive Board of clean develop mechanism(CDM) and international commonly calculation method of emission reduction were used to evaluate the ecological environment benefits of installing household biogas digesters of 2 543 households in 6 towns of land conversion area by calculating the indexes of protected forest area, greenhouse gas and SO2 emission reduction. The results indicated that installing biogas digesters not only protected and increased the forest area, but also reduced greenhouse gas and SO2 emission in land conversion area. After the implementation of the household biogas project, forest area of 507.77 hm2 was protected annually, and greenhouse gas emissions of 7 428.40 t CO2 equivalent and SO2 emissions of 1 594.57 kg were reduced annually. The research provides a reference for rural renewable energy development and evaluation of ecological environment.