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Article

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

1
Global Change Research Institute CAS, Bĕlidla 986/4a, 603 00 Brno, Czech Republic
2
Department of Agrosystems and Bioclimatology, Faculty of Agronomy, Mendel University in Brno, Zĕmĕdelská 1, 613 00 Brno, Czech Republic
3
Earth Observation Research and Innovation Centre, University of Energy and Natural Resources, Sunyani P.O. Box 214, Ghana
4
Faculty of Forestry and Wood Technology, Mendel University in Brno, Zĕmĕdelská 1, 613 00 Brno, Czech Republic
5
Department of Spatial Planning, Institute of Management, Slovak University of Technology in Bratislava, 81107 Bratislava, Slovakia
*
Author to whom correspondence should be addressed.
Academic Editor: Carlos E. Ramos Scharrón
Atmosphere 2021, 12(9), 1128; https://doi.org/10.3390/atmos12091128
Received: 5 July 2021 / Revised: 24 August 2021 / Accepted: 27 August 2021 / Published: 1 September 2021
(This article belongs to the Special Issue Frontiers in Quantifying CO2 Uptake by Forests)
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 Štítná) and spruce species (at Bílý Kr̆íz̆ and Rájec), 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 (GPPpot) courses expected under near-optimal environmental conditions, we computed normalized GPP (GPPnorm) with values between 0 and 1 as the ratio of the estimated daily sum of GPP to GPPpot. The study confirmed the well-known effect of total intensity of the photosynthetically active radiation and its diffuse fraction on GPPnorm 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 Štítná 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 Rájec. 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. View Full-Text
Keywords: eddy covariance; European beech; Norway spruce; potential GPP; normalized; regression modeling eddy covariance; European beech; Norway spruce; potential GPP; normalized; regression modeling
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MDPI and ACS Style

Mensah, C.; Šigut, L.; Fischer, M.; Foltýnová, L.; Jocher, G.; Urban, O.; Wemegah, C.S.; Nyantakyi, E.K.; Chawla, S.; Pavelka, M.; Marek, M.V. Environmental Effects on Normalized Gross Primary Productivity in Beech and Norway Spruce Forests. Atmosphere 2021, 12, 1128. https://doi.org/10.3390/atmos12091128

AMA Style

Mensah C, Šigut L, Fischer M, Foltýnová L, Jocher G, Urban O, Wemegah CS, Nyantakyi EK, Chawla S, Pavelka M, Marek MV. Environmental Effects on Normalized Gross Primary Productivity in Beech and Norway Spruce Forests. Atmosphere. 2021; 12(9):1128. https://doi.org/10.3390/atmos12091128

Chicago/Turabian Style

Mensah, Caleb, Ladislav Šigut, Milan Fischer, Lenka Foltýnová, Georg Jocher, Otmar Urban, Cosmos Senyo Wemegah, Emmanuel K. Nyantakyi, Shilpi Chawla, Marian Pavelka, and Michal V. Marek. 2021. "Environmental Effects on Normalized Gross Primary Productivity in Beech and Norway Spruce Forests" Atmosphere 12, no. 9: 1128. https://doi.org/10.3390/atmos12091128

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