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• W2159264954 abstract "Summary The carbon sink intensity of the biosphere depends on the balance between gross primary productivity ( GPP ) of forest canopies and ecosystem respiration. GPP , however, cannot be directly measured and estimates are not well constrained. A new approach relying on canopy transpiration flux measured as sap flow, and water‐use efficiency inferred from carbon isotope analysis ( GPP SF ) has been proposed, but not tested against eddy covariance‐based estimates ( GPP EC ). Here we take advantage of parallel measurements using the two approaches at a semi‐arid pine forest site to compare the GPP SF and GPP EC estimates on diurnal to annual timescales. GPP SF captured the seasonal dynamics of GPP EC ( GPP SF = 0.99 × GPP EC , r 2 = 0.78, RMSE = 0.82, n = 457 d) with good agreement at the annual timescale (653 vs 670 g C m −2 yr −1 ). Both methods showed that GPP ranged between 1 and 8 g C m −2 d −1 , and the GPP SF / GPP EC ratio was between 0.5 and 2.0 during 82% of the days. Carbon uptake dynamics at the individual tree scale conformed with leaf scale rates of net assimilation. GPP SF can produce robust estimations of tree‐ and canopy‐scale rates of CO 2 uptake, providing constraints and greatly extending current GPP EC estimations." @default.
• W2159264954 created "2016-06-24" @default.
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• W2159264954 date "2015-08-24" @default.
• W2159264954 modified "2023-09-29" @default.
• W2159264954 title "Association between sap flow‐derived and eddy covariance‐derived measurements of forest canopy <scp>CO</scp>₂ uptake" @default.
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• W2159264954 doi "https://doi.org/10.1111/nph.13597" @default.
• W2159264954 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26301599" @default.
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