凤阳山针阔混交林碳通量变化特征及其影响因子

Carbon Flux Variation Characteristics and Its Influencing Factors in Coniferous and Broad-leaved Mixed Forest in Fengyang Mountain

为探究浙江凤阳山针阔混交林的碳通量特征及碳通量与各环境因子间的关系,以及为凤阳山针阔混交林生态功能的提升和碳源(汇)评估提供理论依据。采用涡度相关技术对浙江凤阳山针阔混交林生态系统进行为期11个月的碳通量及环境因子的观测。结果表明:凤阳山针阔混交林碳通量呈现明显的日变化和月变化。在白天,生态系统表现为碳汇,夜间,表现为碳源,日半小时碳通量表现为"U"型曲线变化特征,CO_2通量的范围为-0.501～0.842 mg·m^(-2)·s^(-1);月变化的特点是在7月份表现为很强的碳汇效应,整个研究周期中生态系统碳吸收总量高达540.06 g·m^(-2),整体表现为碳汇;净辐射是影响碳通量变化的重要因子。

We chose the coniferous and broad-leaved mixed forest in Zhejiang Fangyang Mountain to study the carbon source and carbon sink of forests.Using the eddy covariance technique we observed the carbon fluxes and environmental factors in the period of 11 months.The results showed that the carbon fluxes of coniferous and broad-leaved mixed forests in Fengyang Mountain presented daily changes and monthly changes obviously.During the daytime,the ecosystem showed a carbon sink,which showed a carbon source at night.In the day and a half hours,NEE(net ecosystem CO 2 exchange)showed a characteristic of“U”shaped curve,and the CO 2 flux ranged from-0.501 to 0.842 mg·m^-2·s^-1.July has a strong carbon sink effect in the monthly variation.The total carbon uptake by the ecosystem during the entire study cycle was as high as 540.06 g·m^-2,and the ecosystem performance was carbon sink.Net radiation is an important factor affecting carbon flux changes.