0587585 - ÚVGZ 2025 RIV GB eng J - Článek v odborném periodiku
Stojanović, Marko - Jocher, Georg - Kowalska, Natalia - Szatniewska, Justyna - Zavadilová, Ina - Urban, Otmar - Čáslavský, Josef - Horáček, Petr - Acosta, Manuel - Pavelka, Marian - Marshall, John David
Disaggregation of canopy photosynthesis among tree species in a mixed broadleaf forest.
Tree Physiology. Roč. 44, č. 7 (2024), č. článku tpae064. ISSN 0829-318X. E-ISSN 1758-4469
Grant CEP: GA MŠMT LM2023048; GA MŠMT(CZ) EH22_008/0004635
Institucionální podpora: RVO:86652079
Klíčová slova: deciduous angiosperms * eddy covariance * gross primary production * phenology * phloem isotopes * sap flow
Obor OECD: Forestry
Impakt faktor: 4, rok: 2022
Způsob publikování: Open access
https://academic.oup.com/treephys/advance-article/doi/10.1093/treephys/tpae064/7691689

Carbon dioxide sequestration from the atmosphere is commonly assessed using the eddy covariance method. Its net flux signal can be decomposed into gross primary production and ecosystem respiration components, but these have seldom been tested against independent methods. In addition, eddy covariance lacks the ability to partition carbon sequestration among individual trees or species within mixed forests. Therefore, we compared gross primary production from eddy covariance versus an independent method based on sap flow and water-use efficiency, as measured by the tissue heat balance method and δ13C of phloem contents, respectively. The latter measurements were conducted on individual trees throughout a growing season in a mixed broadleaf forest dominated by three tree species, namely English oak, narrow-leaved ash and common hornbeam (Quercus robur L., Fraxinus angustifolia Vahl, and Carpinus betulus L., respectively). In this context, we applied an alternative ecophysiological method aimed at verifying the accuracy of a state-of-the-art eddy covariance system while also offering a solution to the partitioning problem. We observed strong agreement in the ecosystem gross primary production estimates (R2 = 0.56, P < 0.0001), with correlation being especially high and nearly on the 1:1 line in the period before the end of July (R2 = 0.85, P < 0.0001). After this period, the estimates of gross primary production began to diverge. Possible reasons for the divergence are discussed, focusing especially on phenology and the limitation of the isotopic data. English oak showed the highest per-tree daily photosynthetic rates among tree species, but the smaller, more abundant common hornbeam contributed most to the stand-level summation, especially early in the spring. These findings provide a rigorous test of the methods and the species-level photosynthesis offers avenues for enhancing forest management aimed at carbon sequestration.
Trvalý link: https://hdl.handle.net/11104/0354719