兴国县油茶经济林碳汇储量估算与评价

Estimation and evaluation of carbon storage and its potential value in Camellia oleifera plantations in Xingguo County, Jiangxi Province

基于兴国县油茶不同发育时期经济林分,利用实测数据和统计数据估测其生态系统碳储量与碳汇价值。结果表明:(1)油茶经济林植被年生物量总量71.131万t,年总碳储量为42.59万t,单位面积平均生物量为16.94 t·hm-2·a-1,平均碳密度为15.812 t·hm-2·a-1,碳交易的潜在总价值为1 858 385美元(JI)或2 810 808美元(CDM);(2)不同发育时期生物量总量、碳储量总量的分配差异较大,基本随林龄增加趋势的变化,从大到小依次衰产期>盛产期>产前期>初产期,主要分配于盛产期林分和衰产期林分;(3)受林龄结构不合理、经营管理质量低等的主要影响,当前油茶经济林生物量、碳储量、碳密度和碳汇潜在价值均较低,故建议采取扩大新造林面积、提高经营管理水平(尤其对盛产期林分生产力的提高)、衰产期林分与低产林改造等的措施,改善当前油茶经济林的生态经济环境。

Based on the stand of Camellia oleifera economic forest at the different growth period in Xingguo County,Jiangxi Province,the carbon storage and carbon sink value of its ecosystem were estimated by using measured data and statistical data.The results showed that:(1)The total annual biomass of C.oleifera economic forest vegetation,the annual total carbon storage,the average carbon density were711.31million tons,425.9million tons,16.94t·hm^-2·a^-1,15.812t·hm^-2·a^-1,respectively.The potential total price for carbon trading was$1858385(JI)or$2810808(CDM);(2)The distribution of total biomass and total carbon storage in the different growth period was quiet different,and changed with the increasing trend of age.In the age group distribution,the order was period>high yield period>pre-production period>primary production period,the ones were mainly distributed in the high-yield and low-yield stands;(3)The biomass,carbon storage,carbon density and potential value of carbon sink of C.oleifera economic forest were low,due to the unreasonable age structure and low management quality.Therefore,it is suggested that the current eco-economic environment of C.oleifera economic forest was improved by taking measures,such as enlarging new afforestation area,improving management level(especially increasing productivity of high-yielding stands),transforming low-yielding stands and declining stands.