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Overstory dynamics regulate the spatial variability in forest-floor CO2 fluxes across a managed boreal forest landscape

Martinez Garcia, Eduardo and Nilsson, Mats and Laudon, Hjalmar and Lundmark, Tomas and Fransson, Johan and Fransson, Johan E. S. and Wallerman, Jörgen and Peichl, Matthias (2022). Overstory dynamics regulate the spatial variability in forest-floor CO2 fluxes across a managed boreal forest landscape. Agricultural and Forest Meteorology. 318 , 108916
[Research article]

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Abstract

The forest-floor represents an important interface for various carbon dioxide (CO2) fluxes, however, our knowledge of their variability and drivers across a managed boreal forest landscape is limited. Here, we used a three-year (2016-2018) data set of biometric- and chamber-based flux measurements to investigate the net forest-floor CO2 exchange (NEff) and its component fluxes across 50 forest stands spanning different soil types, tree species, and age classes within a 68 km2 boreal catchment in Sweden. We found that the forest-floor acted as a net CO2 source with the 10th-90th percentile (used hereafter for describing reported variations) ranging from 149 to 399 g C m- 2 yr-1. Among the key landscape attributes, stand age strongly affected most NEff component fluxes, whereas tree species and soil type effects were weak and absent, respectively. Specifically, forest-floor net CO2 emissions increased with stand age due to declining understory gross and net primary production, ranging between 77-275 and 49-163 g C m- 2 yr- 1, respectively. Furthermore, we observed higher understory production rates in pine than in spruce stands. Across the 50 stands, the total forest-floor respiration ranged between 340 and 549 g C m- 2 yr-1 and its spatial variation was primarily regulated by its autotrophic components, i.e., understory and tree root respiration, which displayed divergent increasing and decreasing age-related trends, respectively. Furthermore, heterotrophic soil respiration remained within a relatively narrow range (154-290 g C m- 2 yr- 1), possibly owing to compensating gradients in forest-floor properties. We further identified tree biomass as the major driver of the landscape-scale variations of CO2 fluxes, likely attributable to modulating effects on forest-floor resource availability and growing conditions. This implies that tree growth responses to forest management and global change will be particularly important for regulating magnitudes and spatial variations of forest-floor CO2 fluxes in boreal forests.

Authors/Creators:Martinez Garcia, Eduardo and Nilsson, Mats and Laudon, Hjalmar and Lundmark, Tomas and Fransson, Johan and Fransson, Johan E. S. and Wallerman, Jörgen and Peichl, Matthias
Title:Overstory dynamics regulate the spatial variability in forest-floor CO2 fluxes across a managed boreal forest landscape
Series Name/Journal:Agricultural and Forest Meteorology
Year of publishing :2022
Volume:318
Article number:108916
Number of Pages:14
Publisher:ELSEVIER
ISSN:0168-1923
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Meteorology and Atmospheric Sciences
Keywords:Boreal forest, Forest-floor, Landscape variability, Carbon dioxide exchange, Primary production, Respiration
URN:NBN:urn:nbn:se:slu:epsilon-p-117267
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-117267
Additional ID:
Type of IDID
DOI10.1016/j.agrformet.2022.108916
Web of Science (WoS)000795913800006
ID Code:28150
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
(S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management
Deposited By: SLUpub Connector
Deposited On:01 Jun 2022 07:33
Metadata Last Modified:01 Jun 2022 07:41

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