Partitioning of forest floor CO2 emissions reveals the belowground interactions between different plant groups in a Scots pine stand in southern Finland

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Ryhti , K , Kulmala , L , Pumpanen , J , Isotalo , J , Pihlatie , M , Helmisaari , H-S , Leppälammi-Kujansuu , J , Kieloaho , A-J , Bäck , J & Heinonsalo , J 2021 , ' Partitioning of forest floor CO2 emissions reveals the belowground interactions between different plant groups in a Scots pine stand in southern Finland ' , Agricultural and Forest Meteorology , vol. 297 , 108266 . https://doi.org/10.1016/j.agrformet.2020.108266

Title: Partitioning of forest floor CO2 emissions reveals the belowground interactions between different plant groups in a Scots pine stand in southern Finland
Author: Ryhti, Kira; Kulmala, Liisa; Pumpanen, Jukka; Isotalo, Jarkko; Pihlatie, Mari; Helmisaari, Heljä-Sisko; Leppälammi-Kujansuu, Jaana; Kieloaho, Antti-Jussi; Bäck, Jaana; Heinonsalo, Jussi
Contributor: University of Helsinki, Ecosystem processes (INAR Forest Sciences)
University of Helsinki, Department of Forest Sciences
University of Helsinki, University of Eastern Finland
University of Helsinki, Tampere University
University of Helsinki, Department of Agricultural Sciences
University of Helsinki, Forest Soil Science and Biogeochemistry
University of Helsinki, Ecosystem processes (INAR Forest Sciences)
University of Helsinki, Natural Resources Institute Finland (LUKE)
University of Helsinki, Viikki Plant Science Centre (ViPS)
University of Helsinki, Department of Microbiology
Date: 2021-02-15
Language: eng
Number of pages: 12
Belongs to series: Agricultural and Forest Meteorology
ISSN: 0168-1923
URI: http://hdl.handle.net/10138/322864
Abstract: Changes in the climate may have unpredictable effects on belowground carbon processes and thus, the carbon balance of boreal forests. To understand the interactions of these processes in soil and to quantify the potential changes in the carbon cycle, partitioning of forest floor respiration is crucial. For this purpose, we used nine different treatments to separate the sources of forest floor carbon dioxide (CO2) emissions in a mature Scots pine (Pinus sylvestris L.) stand in southern Finland. To partition the belowground CO2 emissions, we used two different trenching methods: 1) to exclude roots and mycorrhizal fungal mycelia (mesh with 1-mu m pores) and 2) to exclude roots, but not mycorrhizal hyphae (mesh with 50-mu m pores). Additionally, we used 3) a control treatment that included roots and fungal hyphae. To partition the CO2 emissions from the forest floor vegetation, we 1) removed it, 2) left only the dwarf shrubs, or 3) left the vegetation intact. The forest floor CO2 emissions were regularly measured with a flux chamber throughout the growing seasons in 2013-2015. The total forest floor respiration was partitioned into respiration of tree roots (contributing 48%), heterotrophic soil respiration (30%) and respiration of ground vegetation other than shrubs (10%), dwarf shrubs (8%), and hyphae of mycorrhizal fungi (4%). Heterotrophic respiration increased in the trenched treatments without ground vegetation over time, due to the so-called 'Gadgil effect'. In the absence of tree mots, but when hyphal access was allowed, respiration in the dwarf shrub treatment increased throughout the experiment. This indicated that dwarf shrubs had fungal connections to outside the experimental plots via their ericoid mycorrhiza. At the same time, other ground vegetation, such as mosses, suppressed the dwarf shrub respiration in trenched treatments. Our results show that competition on the forest floor is intense between plant roots and soil microbes.
Subject: 1172 Environmental sciences
4112 Forestry
boreal forest
Pinus sylvestris
root exclusion
mycorrhiza
soil respiration
ericaceous dwarf shrubs
ORGANIC-MATTER DECOMPOSITION
SOIL RESPIRATION
UNDERSTORY VEGETATION
ROOT RESPIRATION
SPRUCE FORESTS
NORWAY SPRUCE
BOREAL
TEMPERATURE
EXCHANGE
EFFLUX
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