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Article Dans Une Revue Agricultural and Forest Meteorology Année : 2024

Partitioning gross primary production of a boreal forest among species and strata: A multi-method approach

Résumé

We compared three methods of estimating gross primary production (GPP) of a boreal forest dominated by spruce and pine with the goals of 1) converging on the best estimate and 2) disaggregating the GPP among the two canopy species and the understory stratum. The three methods were: 1) eddy covariance (EC), 2) a soil- vegetation-atmosphere transfer model, APES, driven by meteorological data, and 3) an ecophysiological approach (Iso/SF) based on sap flux and phloem δ C, where sap flux is used to estimate stomatal conductance and δ13C is used to estimate intrinsic water-use efficiency (WUEi). The EC and APES methods agreed rather well, which was expected because APES was developed to predict eddy covariance data. The Iso/SF method, which is based on independent data, yielded lower estimates. This was partly because it excluded understory vegetation from the GPP estimate. We also found that the measured sap flux/transpiration estimates for spruce in Iso/SF were much lower than those from APES. In contrast, the absolute values for Scots pines were very similar be- tween the two methods, especially in the summer. In both species, the seasonal dynamics match well among all methods. This multi-method approach allowed us to detect possible problems in the spruce sap-flux measure- ments, but successfully upscaled pine data from ecophysiological traits to stand and ecosystem functioning.
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Licence : CC BY NC ND - Paternité - Pas d'utilisation commerciale - Pas de modification

Dates et versions

hal-04350979 , version 1 (18-12-2023)

Identifiants

Citer

Antoine Vernay, Niles Hasselquist, Kersti Leppä, Anne Klosterhalfen, Jose Gutierrez Lopez, et al.. Partitioning gross primary production of a boreal forest among species and strata: A multi-method approach. Agricultural and Forest Meteorology, 2024, 345, pp.109857. ⟨10.1016/j.agrformet.2023.109857⟩. ⟨hal-04350979⟩
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