拉萨河谷地区青稞农田生态系统服务功能的评价——以达孜县为例

以拉萨河谷地区达孜县为例,运用市场价值法、替代工程法、影子价格法等方法对青稞农田生态系统生产农产品、固定CO2、释放O2、涵养水分、维持营养循环等服务功能进行了计算。结果表明:达孜县青稞农田生态系统各项服务功能的总价值为37249.77×104元,各项服务功能的价值依次为:农产品价值16973.38×104元(45.57%)、释放O2价值10649.81×104元(28.59%)、固定CO2价值7875.03×104元(21.14%)、营养循环价值1478.23×104元(3.97%)、涵养水分价值273.32×104元(0.73%)。由此可知熏达孜县青稞农田生态系统为其经济生产力提供了巨大的生态服务,其农产品生产服务功能尤为突出。

Valuation of barley agro-ecosystem services in Lhasa-river valley region-A case study of Dazi County

Agro-ecosystem is very important to our human beings, but the fact is we know veryless about its ecosystem services.So this study selects barley agro-ecosystem of Dazi County in Lhasa-river valley and uses different methods (such as market value,substitution engineering,shadow price)to calculate its value.The result shows that the total value of barley agro-ecosystem services is 37 249.77×104 yuan;the order of various ecosystem services values is respectively production value16 973.38×104 yuan(45.57%),release of O2 10 649.81×104 yuan(28.59%),fixation of CO2 7 875.03×104 yuan(21.14%),nutrient circle maintained 1 478.23×104 yuan(3.97%),and water holding 273.32×104 yuan(0.73%).So agro-ecosystem provides great ecological services to its economic productivity,but the production service is its most important service.