Evaluating the convergence between eddy-covariance and biometric methods for assessing carbon budgets of forests.
Evaluating the convergence between eddy-covariance and biometric methods for assessing carbon budgets of forests.
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DOI:
10.1038/ncomms13717
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发表时间:
2016-12-14
影响因子:
16.6
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中科院分区:
文献类型:
--
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The eddy-covariance (EC) micro-meteorological technique and the ecology-based biometric methods (BM) are the primary methodologies to quantify CO2 exchange between terrestrial ecosystems and the atmosphere (net ecosystem production, NEP) and its two components, ecosystem respiration and gross primary production. Here we show that EC and BM provide different estimates of NEP, but comparable ecosystem respiration and gross primary production for forest ecosystems globally. Discrepancies between methods are not related to environmental or stand variables, but are consistently more pronounced for boreal forests where carbon fluxes are smaller. BM estimates are prone to underestimation of net primary production and overestimation of leaf respiration. EC biases are not apparent across sites, suggesting the effectiveness of standard post-processing procedures. Our results increase confidence in EC, show in which conditions EC and BM estimates can be integrated, and which methodological aspects can improve the convergence between EC and BM. Site-level quantification of Net Ecosystem Production (NEP) and associated components rely on eddy covariance and biometric methods. Here these techniques are compared for global forest carbon fluxes, revealing differences in NEP, but similar estimates of ecosystem respiration and gross primary production.
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影响因子:
11.6
作者:
Baldocchi, Dennis
通讯作者:
Baldocchi, Dennis
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Schulze, E. -D.
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