吴旗县退耕还林生态效益价值评估

生态效益的评价和核算对评价林业生态工程的建设效果至关重要。综合运用专家咨询、理论分析法和频度分析3种方法。建立了吴旗县退耕还林生态效益评价指标体系，使用市场价值法、影子工程法、机会成本法和替代法等方法，对该县退耕还林6年来的生态效益进行了价值核算。结果表明：吴旗县退耕还林工程具有巨大的生态效益,核算后的总生态价值约为24．8亿元，其中拦蓄保护水资源价值为6．4亿元，保护土地资源退化价值为6亿元，净化空气价值为5．3亿元，改善小气候价值0．3亿元，保护农田价值为0．02亿元．增加生物多样性价值为6．7亿元。研究结果可为黄土区退耕还林工程建设效益评价提供参考。

Valuing Ecological Effects of Land Conversion Project in Wuqi County

Valuing the ecological effects is crucial to the assessment of output of the forestry project.This paper suggested an assessment system for the ecological effects of the land conversion project in Wuqi county,applying expert consultation,the layer analysis and the frequency analysis;and the paper also calculated the value of ecological effects from 1999 to 2004 using market valuation method,shadow engineering method,opportunity cost method,substitute expense method,among others.The results showed that the land conversion project in Wuqi county has produced tremendous ecological effects.The ecological value is up to about 2.48 billion yuan(RMB) in total,among which contributed by water resource conservation,soil conservation,air cleaning,microclimate improvement,farmland shelter and biodiversity increase are 0.64,0.60,0.53,0.03,0.002 and 0.67 billion yuan(RMB) respectively.The results may be a reference for the assessment of ecological effects of the land conversion project being carried out in the Loess Plateau.