基于通量源区模型的雷竹林生态系统碳通量信息提取  

Carbon flux extraction for a Phyllostachys violascens ecosystem based on the flux footprint analysis

作　　者：陈丽萍[1] 李平衡[1] 莫路锋[2] 周国模[1] 李金荣[2] 

机构地区：[1]浙江农林大学环境与资源学院浙江省森林生态系统碳循环与固碳减排重点实验室,浙江临安311300 [2]浙江农林大学信息工程学院,浙江临安311300

出　　处：《浙江农林大学学报》2016年第1期1-10,共10页Journal of Zhejiang A&F University

基　　金：国家林业局引进国际先进农业科学技术计划("948"计划)项目(2013-4-71);国家自然科学基金资助项目(61190114;61303236);浙江省科技计划项目重大科技专项(2012C13011-1)

摘　　要：基于浙江省临安市太湖源雷竹Phyllostachys violascens林涡度相关通量观测塔2013年全年数据,应用通量源区模型(flux source area model,FSAM),分析不同大气稳定度条件、不同风向和不同时间段该观测点通量信息的贡献区的分布,并基于贡献区分析结果,从通量观测值中分解出来自雷竹林生态系统的碳通量信息。结果表明:90%贡献水平的通量贡献区在观测塔为中心的2.0 km×2.0 km范围内,大气稳定度相同时,4个不同方向的通量贡献区范围差别不大。通量贡献区长度在稳定的大气条件下要显著大于在不稳定大气条件下,前者为96.19~941.63 m,后者为28.62~313.54 m。通过雷竹林和非雷竹林在通量贡献区所占面积和各自的贡献率,从涡度相关所测通量数据中分解出雷竹林和非雷竹林的月平均碳通量。通量分解后的雷竹林生态系统年总净固碳量为4.25 t·hm^(-2)·a^(-1),当下垫面全部为非雷竹林时年总净固碳量为6.65 t·hm^(-2)·a^(-1)。如果不进行碳通量的分解,把涡度相关所测通量值作为雷竹林的通量值,则年总净固碳量为5.46 t·hm^(-2)·a^(-1)。该研究对于正确评价雷竹林生态系统的固碳能力可提供一定理论依据。This study was conducted to explain distribution of the flux source area and the spatial representa- tion of flux measurements for mixed Phyllostachys violascens （Lei bamboo） and non-Lei bamboo stands in Tai- huyuan. Based on the Flux Source Area Model （FSAM）, footprint and source area functions were calculated using the continuous flux measurement with the open-path eddy covariance system for the full-year of 2013. Carbon fluxes, according to the area occupied and the contribution of Lei and non-Lei bamboo stands, were separated from the measured eddy covariance flux measurement values to determine the monthly average carbon fluxes using the flux footprint analysis. Results showed that the area responsible for 90% of the surface influ- ence was about 2.0 km x 2.0 km and was centered at the flux observation tower. Few differences were noted in flux source area at the four cardinal directions; however, the flux source area was much greater in atmospheric conditions that were stable （having a range of 96.19-941.63 m） compared to unstable （with a range of 28.62- 313.54 m）. After separation of Lei and non-Lei bamboo stands, the total net carbon sequestration of the Lei bamboo ecosystem was 4.25 t·hm-2·a-1, and when the underlying surface consisted of non-Ph, violascens it was 6.65t·hm-2·a-1. Without separation, using the eddy eovarianee measurements as the Lei bamboo tern flux value, total net sequestration was 5.46 t·hm-2·a-1. This research could help with more acorn-ate tions of carbon sequestration capacity in a Lei bamboo ecosystem. [Ch, 4 fig. 4 tab. 29 ref. stands, eeosys- evaluations of carbon sequestration capacity in a Lei bamboo ecosystem.

关 键 词：森林生态学 通量源区模型(FSAM) 雷竹林 涡度相关 碳通量 

分 类 号：S718.55[农业科学—林学]