北京市经济林生态系统服务功能评估

Evaluation of the Service Function of Beijing Non-timber Forest Ecosystem

依照《森林生态系统服务功能评估规范》(LY/T 1721-2008),以北京市13个区县、14个经济林树种为研究对象,定量评估北京市经济林生态系统服务功能。结果表明,北京市年经济林生态系统涵养水源和保育土壤等7项评估指标总价值为78.41亿元,以涵养水源(30.15亿元·a^(-1))、固碳释氧(17.42亿元·a^(-1))、净化大气环境(11.59亿元·a^(-1))为主;北京市各区经济林生态系统中密云区、平谷区和怀柔区的服务价值相对高于其他区县;以板栗林生态服务价值量较高(29.90%);北京市各项生态服务功能空间分布格局由大到小基本呈现为:东北部、西北部、西南部、东南部、中部。

According to the standards of"Forest Ecosystem Service Function Assessment"(LY/T 1721-2008),14 tree species of non-timber forest occurring in 13 districts and counties of Beijing were taken as the research objects to quantitatively evaluate the ecosystem service function.It was found that the total value of seven evaluation indexes of water conservation and soil conservation of non-timber forest ecosystem in Beijing was 7.841 billion yuan,mainly including water conservation(3.015 billion yuan/a),carbon fixation and oxygen release(1.742 billion yuan/a)and atmospheric environment purification(1.159 billion yuan/a).The service values of Miyun District,Pinggu District and Huairou District was higher than those of other districts and counties.The ecological service value of Castanea mollissima forest was higher(29.90%)than those of other tree species.The spatial distribution pattern of ecological service functions in Beijing basically showed the trend of Northeast,Northwest,Southwest,Southeast,Central.