西藏公益林森林生态系统服务功能价值评估研究

Ecosystem Service Value Assessment of Xizang Public Welfare Forests

西藏自治区森林资源丰富,是我国重要的生态安全屏障,探究西藏公益林生态系统功能价值对掌握地方生态状况、保护森林资源有重要作用。基于西藏自治区1244个固定样地资源环境和生态状况的调查数据,结合有关资料,计算西藏自治区公益林生态系统服务价值,并从森林生态状况与森林生态效益两方面展开分析,对其公益林生态系进行综合评价。结果显示:(1)西藏自治区生态公益林整体生态状况较好;(2)全区生态公益林生态系统服务价值总量6578×10^(8)元/a,总生物量108621.5×10^(4)t,总碳储量54506.3×10^(4)t;(3)全区公益林生态服务功能实现涵养水源、固土保肥、固碳释氧、净化大气、滞尘减噪和生物多样性保护等年实物量共496.70×10^(8) t;(4)西藏公益林森林生态系统服务在森林游憩方面的价值功能有待提升。

Xizang is rich in forest resources and is an important ecological security barrier in China.To explore the ecosystem function value of Xizang’s public welfare forest that plays an important role in understanding local ecological conditions and protecting forest resources.Based on the survey data on resource environment and ecological status of 1244 fixed sample plots in Xizang,combined with relevant information,the ecosystem service value of Xizang’s public welfare forests was calculated,and analysis and evaluation research were carried out from two aspects:forest ecological status and forest ecological benefits.The results showed that:(1)The overall ecological status of ecological public welfare forests in Xizang is good;(2)The total ecosystem service value of ecological public welfare forests in the region is 6578×10^(8) yuan/a,the total biomass is 108621.5×10^(4) t,and the total carbon storage is 54506.3×10^(4) t;(3)The ecological service functions of public welfare forests in the region achieve a total annual physical volume of 496.70×10^(8) t,such as conserving water sources,consolidating soil and fertilizers,fixing carbon and releasing oxygen,purifying the atmosphere,retaining dust and noise,and protecting biodiversity.(4)The value function of Xizang's public welfare forest ecosystem services in forest recreation needs to be improved.