Partitioning of forest floor CO2 emissions reveals the belowground interactions between different plant groups in a Scots pine stand in southern Finland
| Autor: | Jaana Leppälammi-Kujansuu, Mari Pihlatie, Jaana Bäck, Kira Ryhti, Antti Jussi Kieloaho, Jarkko Isotalo, Liisa Kulmala, Jussi Heinonsalo, Jukka Pumpanen, Heljä-Sisko Helmisaari |
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| Přispěvatelé: | Tampere University, Computing Sciences, Ecosystem processes (INAR Forest Sciences), Department of Forest Sciences, Department of Agricultural Sciences, Environmental Soil Science, Viikki Plant Science Centre (ViPS), Methane and nitrous oxide exchange of forests, Forest Soil Science and Biogeochemistry, Forest Ecology and Management, Department of Microbiology, Department of Food and Nutrition |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Atmospheric Science BOREAL EFFLUX 010504 meteorology & atmospheric sciences ORGANIC-MATTER DECOMPOSITION ved/biology.organism_classification_rank.species ericaceous dwarf shrubs mycorrhiza soil respiration 01 natural sciences Shrub Carbon cycle Soil respiration ROOT RESPIRATION boreal forest root exclusion Mycorrhiza EXCHANGE TEMPERATURE 1172 Environmental sciences 0105 earth and related environmental sciences Forest floor 4112 Forestry Global and Planetary Change biology ved/biology Taiga Scots pine NORWAY SPRUCE Pinus sylvestris Forestry Vegetation 15. Life on land biology.organism_classification 113 Computer and information sciences UNDERSTORY VEGETATION Agronomy 13. Climate action Environmental science SPRUCE FORESTS Agronomy and Crop Science 010606 plant biology & botany |
| Popis: | 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-µm pores) and 2) to exclude roots, but not mycorrhizal hyphae (mesh with 50-µm 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 roots, 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. publishedVersion |
| Databáze: | OpenAIRE |
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