Soil organic matter, rather than temperature, determines the structure and functioning of subarctic decomposer communities
Autor: | Juha Mikola, Marleena Hagner, Eoin O'Gorman, Sinikka Robinson, Beat Frey |
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Přispěvatelé: | Environmental Change Research Unit (ECRU), Ecosystems and Environment Research Programme, Fifth Dimension - Vegetated roofs and walls in urban areas, Urban Ecosystems |
Rok vydání: | 2022 |
Předmět: |
LONG-TERM
Climate Change LITTER DECOMPOSITION Soil soil organic matter Environmental Chemistry MICROBIAL COMMUNITIES NITROGEN MINERALIZATION plant biomass 1172 Environmental sciences Ecosystem Soil Microbiology natural experiment General Environmental Science Global and Planetary Change decomposition CLIMATE-CHANGE Ecology structural equation model Temperature N mineralization Plants CARBON LOSS ecosystem functioning 1181 Ecology evolutionary biology GEOTHERMAL ECOSYSTEMS SENSITIVITY RESPONSES |
Zdroj: | Global Change Biology. 28:3929-3943 |
ISSN: | 1365-2486 1354-1013 |
Popis: | The impacts of climate change on ecosystem structure and functioning are likely to be strongest at high latitudes due to the adaptation of biota to relatively low temperatures and nutrient levels. Soil warming is widely predicted to alter microbial, invertebrate, and plant communities, with cascading effects on ecosystem functioning, but this has largely been demonstrated over short-term (10 year) warming studies. Using a natural soil temperature gradient spanning 10-35°C, we examine responses of soil organisms, decomposition, nitrogen cycling, and plant biomass production to long-term warming. We find that decomposer organisms are surprisingly resistant to chronic warming, with no responses of bacteria, fungi, or their grazers to temperature (fungivorous nematodes being an exception). Soil organic matter content instead drives spatial variation in microorganism abundances and mineral N availability. The few temperature effects that appear are more focused: root biomass and abundance of root-feeding nematodes decrease, and nitrification increases with increasing soil temperature. Our results suggest that transient responses of decomposers and soil functioning to warming may stabilize over time following acclimation and/or adaptation, highlighting the need for long-term, ecosystem-scale studies that incorporate evolutionary responses to soil warming. |
Databáze: | OpenAIRE |
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