湘西土家族苗族自治州公益林生态系统服务功能评价

Evaluation on ecosystem service of ecological public welfare forest in Xiangxi Tujia and Miao Autonomous Prefecture

科学评价公益林生态系统服务功能,对于充分展示公益林保护工程建设成果具有重要意义。本文基于湘西土家族苗族自治州2017年公益林完善落界成果与2019年面上固定样地调查成果,通过分布式测算方法,对其公益林生态服务功能的物质量和价值量进行评价。结果表明:2019年湘西自治州公益林质量处于湖南省中等水平,以永顺县最高、泸溪县最低;其物质量各项指标均占全省总物质量的1/10;总价值量为510.4339亿元·a^(-1),主要以涵养水源、生物多样性保护、森林游憩功能为主,三者之和约占总价值量的80%。对于各县(市)公益林,总价值量以永顺县、龙山县、保靖县排名前三,单位面积价值量以凤凰县最高,吉首市最低;对于不同起源公益林,总价值量为天然林高于人工林;单位面积价值量除了生物多样性保护功能,均表现为人工林高于天然林。

Scientific evaluation of public welfare forest ecosystem service function is of great significance to fully display the construction achievements of public welfare forest protection project.In this paper,based on the results of public welfare forest in 2017 and the survey results of general fixed sample plots in 2019 in Xiangxi Tujia and Miao Autonomous Prefecture,the material quality and value of ecological service function of public welfare forest were evaluated by distributed calculation method.The results shows that the quality of public welfare forest in the prefecture was at the middle level in the province in 2019 with the highest at Yongshun County and the lowest at Luxi County.All the indexes of its physical quality accounted for one tenth of the total physical quality of the whole province.The total value was 51.04339 billion yuan in 2019,mainly for water conservation,biodiversity protection,and forest recreation function,which accounted for about 80% of the total value.Yongshun County,Longshan County,and Baojing County ranked the top three in total value.Fenghuang County was the highest in unit area value,while Jishou City was the lowest.For different origins of public welfare forest,the total value of natural forest was higher than that of artificial forest,and the unit area value of artificial forest was higher than that of natural forest except for biodiversity protection function.