神农架大九湖泥炭地碳储量估算及固碳能力研究

Estimation of Carbon Storage and Study on Carbon Sequestration Ability of Dajiuhu Peatland on Shennongjia Mountain, Hubei Province, China

通过对神农架大九湖泥炭地进行野外调查和长期观测,采用经验公式和实验室分析方法,计算了神农架大九湖泥炭地土壤有机碳含量和有机碳储量,并对2016—2018年神农架大九湖泥炭地的固碳能力特征进行了分析。结果表明:在0~100 cm深度范围内,神农架大九湖泥炭地土壤有机碳含量的变化范围为282.90~516.10 g/kg,土壤有机碳储量为7.04×10^(5) t,并估算得到在总沉积深度为0~260 cm范围内神农架大九湖泥炭地土壤有机碳总储量为1.45×10^(6)~1.61×10^(6) t,有机碳积累强度为1800~2000 t/hm^(2);在2016—2018年3年间,神农架大九湖泥炭地净生态系统生产力(NEP)与CH_(4)通量较高的月份均出现在5~9月水热同期的时间段内,期间泥炭地固碳总量约为6975.00 t,单位面积年均固碳量为3.09 t/hm^(2),在月变化水平上泥炭地固碳量与气温和降雨量呈正相关关系,观测期间的固碳功能未发生改变,泥炭地整体表现为碳汇。

Based on the field investigation and long-term observation of Dajiuhu peatland on Shennongjia Mountain,Hubei Province,China,using empirical formulas and laboratory analysis methods,this paper calculates the organic carbon content of soil and organic carbon storage of Dajiuhu peatland on Shennongjia Mountain,and analyzes the characteristics of carbon sequestration capacity from 2016 to 2018.The results show that the range of the organic carbon content of soil in the depth range of 0-100 cm is 282.90-516.10 g/kg;the organic carbon storage of soil in the depth range of 0-100 cm is 7.04×10^(5) tonnes,and it is estimated that the total organic carbon storage soil in the range of 0-260 cm of the total deposition depth is 1.45-1.61×10^(6) tonnes,and the carbon accumulation intensity is 1800-2000 tonnes per hectare.The months with high net ecosystem productivity(NEP)and methane flux of Dajiuhu peatland in Shennongjia generally occur in the same period of high temperature and precipitation from May to September in 2016-2018,the total amount of carbon sequestration in 2016-2018 is about 6975.00 tonnes,the average annual carbon sequestration per unit area is 3.09 tonnes per hectare per year,and the carbon sequestration value is positively correlated with temperature and rainfall at the monthly change level.The carbon sequestration function of the study area does not change during the observation period,and the peatland as a whole is a carbon sink.