杭州花港观鱼公园森林固碳效益评估

Forest carbon storage function value at Hangzhou Huagangguanyu Park

为构建固碳高效的城市森林,以杭州花港观鱼公园为研究对象,对公园的植物种类以及植物群落结构进行详细的实地调研,运用i-Tree模型Eco V 6.0模块对公园的固碳效益进行评估研究。结果表明:(1)花港观鱼公园内有树木5 726株,隶属43科79属119种; 5类优势种桂花Osmanthus fragrans,山茶Camellia japonica,鸡爪槭Acer palmatum,水杉Metasequoia glyptostroboides和广玉兰Magnolia grandiflora共计2 386株,占总数的41.70%;园内常绿树种占52.17%,落叶树种占47.83%;阔叶树种占86.74%,针叶树种占13.26%;树木胸径在7.60~<15.20 cm最多,分布呈现"中间多,两边少"的趋势。花港观鱼公园Margalef丰富度指数为13.64, Simpson指数为0.95。(2)2016年花港观鱼公园固碳量约54.95 t·a^(-1),效益约6.59万元·a^(-1);公园总碳储量约806.90 t,效益约968.28万元;大树(胸径≥30.00 cm的树木)数量占全园树木24.54%,其固碳量约占全园总量的58.51%;公园内固碳能力较强的树种包括樟树Cinnamomum camphora,枫杨Pterocarya stenoptera,广玉兰等。与12个北美城市相比,花港观鱼公园的树木固碳量较高。

To provide a scientific basis for building a carbon-efficient urban forest,a detailed study of the plant species and community structure,based on work done at the Hangzhou Huagangguanyu Park,was conducted using i-Tree model Eco V 6.0 to evaluate the carbon storage function value of the park.Referred to i-Tree model user’s manual,a systematic survey was done with per-wood survey method for the data required by the study.Evaluation also included use of the Margalef index and the Simpson index.Results showed(1)a total of 5 726 trees in the study area belonging to 43 families,79 genera,and 119 species.Five types of dominant tree species,including Osmanthus fragrans,Camellia japonica,Acer palmatum,Metasequoia glyptostroboides,and Magnolia grandiflora,in total of 2 386 trees,accounted for 41.70%.Evergreen species in the garden accounted for 52.17%and deciduous species 47.83%;broadleaf species accounted for 86.74%and coniferous species 13.26%.Most trees in the park were in the DBH range of about 7.60-<15.20 cm and were mainly distributed in the middle.The overall Margalef index for the park was 13.64,and the Simpson index was 0.95.(2)Carbon sequestration for the park in 2016 was about 54.95 tons,worth 65.9 thousands Renminbi Yuan,and the total carbon storage was about 806.90 tons,worth 968.28 million Renminbi Yuan.Trees with a DBH≥30.00 cm accounted for 24.54%of all garden trees,and had a carbon content of about 58.51%of the total park.Tree species with the strongest carbon sequestration in the park were Cinnamomum camphora,Pterocarya stenoptera,and Magnolia grandiflora.Overall,compared to 12 North American cities,Huagangguanyu Park had a high carbon sequestration rate.