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Environmental Effects on Normalized Gross Primary Productivity in Beech and Norway Spruce Forests

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    0548047 - ÚVGZ 2022 RIV CH eng J - Journal Article
    Mensah, Caleb - Šigut, Ladislav - Fischer, Milan - Foltýnová, Lenka - Jocher, Georg - Urban, Otmar - Wemegah, C.S. - Nyantakyi, E.K. - Chawla, Shilpy - Pavelka, Marian - Marek, Michal V.
    Environmental Effects on Normalized Gross Primary Productivity in Beech and Norway Spruce Forests.
    Atmosphere. Roč. 12, č. 9 (2021), č. článku 1128. E-ISSN 2073-4433
    R&D Projects: GA MŠk(CZ) LM2018123
    Research Infrastructure: CzeCOS III - 90123
    Institutional support: RVO:86652079
    Keywords : net ecosystem exchange * eddy covariance technique * soil respiration * atmospheric demand * drought * water * temperature * co2 * regeneration * sensitivity * eddy covariance * European beech * Norway spruce * potential GPP * normalized * regression modeling
    OECD category: Ecology
    Impact factor: 3.110, year: 2021
    Method of publishing: Open access
    https://www.mdpi.com/2073-4433/12/9/1128

    The strong effects of climate change are expected to negatively impact the long-term resilience and function of forest ecosystems, which could lead to changes in forest carbon balance and productivity. However, these forest responses may vary with local conditions and forest types. Accordingly, this study was carried out to determine gross primary productivity (GPP) sensitivity to changes in environmental parameters. Central European beech (at Stitna) and spruce species (at Bily Kriz and Rajec), growing under contrasting climatic conditions, were studied. The comparative analyses of GPP were based on a five-year-long dataset of eddy covariance fluxes during the main growing season (2012-2016). Results of forest GPP responses with changes in environmental factors from a traditional Stepwise multiple linear regression model (SMLR) were used and compared with Random forest (RF) analyses. To demonstrate how actual GPP trends compare to potential GPP (GPP(pot)) courses expected under near-optimal environmental conditions, we computed normalized GPP (GPP(norm)) with values between 0 and 1 as the ratio of the estimated daily sum of GPP to GPP(pot). The study confirmed the well-known effect of total intensity of the photosynthetically active radiation and its diffuse fraction on GPP(norm) across all the forest types. However, the study also showed the secondary effects of other environmental variables on forest productivity depending on the species and local climatic conditions. The reduction in forest productivity at the beech forest in Stitna was presumed to be mainly induced by edaphic drought (anisohydric behaviour). In contrast, reduced forest productivity at the spruce forest sites was presumably induced by both meteorological and hydrological drought events, especially at the moderately dry climate in Rajec. Overall, our analyses call for more studies on forest productivity across different forest types and contrasting climatic conditions, as this productivity is strongly dependent on species type and site-specific environmental conditions.
    Permanent Link: http://hdl.handle.net/11104/0324174

     
     
Number of the records: 1