Strong Interactive Effects of Warming and Insect Herbivory on Soil Carbon and Nitrogen Dynamics at Subarctic Tree Line

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Meyer , N , Silfver , T , Karhu , K , Myller , K , Sietiö , O-M , Myrsky , E , Oksanen , E , Rousi , M & Mikola , J 2021 , ' Strong Interactive Effects of Warming and Insect Herbivory on Soil Carbon and Nitrogen Dynamics at Subarctic Tree Line ' , Frontiers in Forests and Global Change , vol. 4 , 773223 . https://doi.org/10.3389/ffgc.2021.773223

Title: Strong Interactive Effects of Warming and Insect Herbivory on Soil Carbon and Nitrogen Dynamics at Subarctic Tree Line
Author: Meyer, Nele; Silfver, Tarja; Karhu, Kristiina; Myller, Kristiina; Sietiö, Outi-Maaria; Myrsky, Eero; Oksanen, Elina; Rousi, Matti; Mikola, Juha
Contributor organization: Soils and climate change
Department of Forest Sciences
Faculty of Biological and Environmental Sciences
Forest Soil Science and Biogeochemistry
Forest Ecology and Management
Ecosystems and Environment Research Programme
Date: 2021-11-11
Language: eng
Number of pages: 14
Belongs to series: Frontiers in Forests and Global Change
ISSN: 2624-893X
DOI: https://doi.org/10.3389/ffgc.2021.773223
URI: http://hdl.handle.net/10138/337691
Abstract: Warming will likely stimulate Arctic primary production, but also soil C and N mineralization, and it remains uncertain whether the Arctic will become a sink or a source for CO2. Increasing insect herbivory may also dampen the positive response of plant production and soil C input to warming. We conducted an open-air warming experiment with Subarctic field layer vegetation in North Finland to explore the effects of warming (+3 degrees C) and reduced insect herbivory (67% reduction in leaf damage using an insecticide) on soil C and N dynamics. We found that plant root growth, soil C and N concentrations, microbial biomass C, microbial activity, and soil NH4+ availability were increased by both warming and reduced herbivory when applied alone, but not when combined. Soil NO3- availability increased by warming only and in-situ soil respiration by reduced herbivory only. Our results suggest that increasing C input from vegetation under climate warming increases soil C concentration, but also stimulates soil C turnover. On the other hand, it appears that insect herbivores can significantly reduce plant growth. If their abundance increases with warming as predicted, they may curtail the positive effect of warming on soil C concentration. Moreover, our results suggest that temperature and herbivory effects on root growth and soil variables interact strongly, which probably arises from a combination of N demand increasing under lower herbivory and soil mineral N supply increasing under higher temperature. This may further complicate the effects of rising temperatures on Subarctic soil C dynamics.
Subject: primary production
root growth
climate warming
microbial biomass
soil respiration
soil organic matter
ORGANIC-MATTER DECOMPOSITION
TEMPERATURE SENSITIVITY
BIRCH FOREST
FUMIGATION-EXTRACTION
OPEROPHTERA-BRUMATA
PLANT-COMMUNITIES
VEGETATION
TUNDRA
BIOMASS
RESPIRATION
1181 Ecology, evolutionary biology
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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