Inventory and eddy covariance-based estimates of annual carbon sequestration in a Sitka spruce (Picea sitchensis (Bong.) Carr.) forest ecosystem
Inventory and eddy covariance-based estimates of annual carbon sequestration in a Sitka spruce (Picea sitchensis (Bong.) Carr.) forest ecosystem
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DOI：
10.1007/s10342-005-0092-4
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发表时间：
2007-04-01
影响因子：
2.8
通讯作者：
Osborne, B.
中科院分区：
文献类型：
--
作者：
Black, K.;Bolger, T.;Osborne, B.
采用涡度相关法和清查法对林冠封闭的锡特卡云杉林2年的年净生态系统生产力（NEP）进行了比较。使用生态清查（NEPeco）方法估计森林的年净碳吸收量（C）在7.30 - 11.44 t C ha（-1）年（-1）之间，使用基于涡动协方差的NEP（-NEE）评估估计在7.69-9.44 t C ha（-1）年（-1）之间。由于生物量增量（15-21%）和异养呼吸（12-19%）估计值的不确定性和误差，这些差异并不显著。碳储量变化清单（NEP Δ C）值显着较高（27-32%），相比，NEPeco和NEE的估计。对从本研究中获得的数据以及已发表的数据进行的其他分析表明，由于分解过程不明和土壤碳储量变化估计的不确定性，NEP Delta C评估存在系统性高估。相比之下，有NEPeco和涡度协方差评估在广泛的森林类型和地理位置之间没有系统的差异。
A comparison was made of annual net ecosystem productivity (NEP) of a closed canopy Sitka spruce forest over 2 years, using either eddy covariance or inventory techniques. Estimates for annual net uptake of carbon (C) by the forest varied between 7.30 and 11.44 t C ha(-1) year(-1) using ecological inventory (NEPeco) measures and 7.69-9.44 t C ha(-1) year(-1) using eddy covariance-based NEP (-NEE) assessments. These differences were not significant due to uncertainties and errors associated with estimates of biomass increment (15-21%) and heterotrophic respiration (12-19%). Carbon-stock change inventory (NEP Delta C ) values were significantly higher (27-32%), when compared to both NEPeco- and -NEE-based estimates. Additional analyses of the data obtained from this study, together with published data, suggest that there was a systematic overestimation of NEP Delta C -based assessments due to unaccounted decomposition processes and uncertainties in the estimation of soil-C stock changes. In contrast, there was no systematic difference between NEPeco and eddy covariance assessments across a wide range of forest types and geographical locations.