Warming and ozone exposure effects on silver birch (Betula pendula Roth) leaf litter quality, microbial growth and decomposition

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http://hdl.handle.net/10138/307758

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Kasurinen , A , Silfver , T , Rousi , M & Mikola , J 2017 , ' Warming and ozone exposure effects on silver birch (Betula pendula Roth) leaf litter quality, microbial growth and decomposition ' , Plant and Soil , vol. 414 , no. 1-2 , pp. 127-142 . https://doi.org/10.1007/s11104-016-3122-8

Title: Warming and ozone exposure effects on silver birch (Betula pendula Roth) leaf litter quality, microbial growth and decomposition
Author: Kasurinen, Anne; Silfver, Tarja; Rousi, Matti; Mikola, Juha
Contributor: University of Helsinki, University of Helsinki
University of Helsinki, University of Helsinki
Date: 2017-05
Language: eng
Number of pages: 16
Belongs to series: Plant and Soil
ISSN: 0032-079X
URI: http://hdl.handle.net/10138/307758
Abstract: Background and aims Climate warming is expected to accelerate decomposition in boreal forests, but the concomitant effects of tropospheric ozone (O-3), a phytotoxic greenhouse gas, alone and in combination with warming, are poorly understood. We studied how these two climatic factors affect leaf litter decomposition of two silver birch genotypes. Methods We used field exposure for growing saplings and native and reciprocal transplant experiments for litter incubation to disentangle environmental and litter quality mediated effects of temperature and O-3 on litter mass loss. We analysed litter C% and N% and microbial biomass (using qPCR) in fresh litter and after 217 and 257 days of incubation. Results Warming decreased fresh litter C% and N% and bacterial DNA, whereas elevated O-3 increased N% and bacterial and fungal DNA, equally for both genotypes. In contrast, most effects on microbes during litter incubation varied between the two genotypes. Warming effects on microbes were mainly environmental, but despite having effects on litter quality and microbial growth, warming and O-3 both had only weak or no effects on litter mass loss. Conclusions Litter quality and microbial growth in northern birch stands are likely to change due to warming and O-3 exposures, but effects on litter decomposition rate may remain weak.
Subject: Tropospheric ozone
Climate warming
Silver birch
Litter decomposition
Bacteria
Fungi
TROPOSPHERIC OZONE
COMMUNITY STRUCTURE
CLIMATE-CHANGE
CARBON ALLOCATION
ELEVATED OZONE
RATES
CHEMISTRY
O-3
CO2
METAANALYSIS
1183 Plant biology, microbiology, virology
4111 Agronomy
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