A1 Refereed original research article in a scientific journal
Tannins can slow-down but also speed-up soil enzymatic activity in boreal forest
Authors: Adamczyk B, Karonen M, Adamczyk S, Engstrom MT, Laakso T, Saranpaa P, Kitunen V, Smolander A, Simon J
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication year: 2017
Journal: Soil Biology and Biochemistry
Journal name in source: SOIL BIOLOGY & BIOCHEMISTRY
Journal acronym: SOIL BIOL BIOCHEM
Volume: 107
First page : 60
Last page: 67
Number of pages: 8
ISSN: 0038-0717
DOI: https://doi.org/10.1016/j.soilbio.2016.12.027
Abstract
The boreal forest ecosystem stores substantial amounts of soil organic matter (SOM), which may act either as a source or as a sink for atmospheric CO2 under climate change and that is why enzymatic SOM degradation is gaining increasing attention. The boreal forest ecosystem is rich in plant secondary compounds and in particular tannins which are seen as enzyme inhibitors. We studied changes in enzymatic activity after the addition of tannins. Our experimental design combined direct studies of the tannin effects on enzymes with laboratory soil mesocosm experiments. Our results showed that the addition of tannins directly led to both decreases and increases in the catalytic activity of enzymes, however, some differences between enzymes were observed. Overall, low concentrations of tannins increased the coiled structures of the enzymes boosting their catalytic activity. High concentrations of tannins acted in the opposite way, thereby diminishing the catalytic activity. We observed that tannins caused a similar change in enzymatic activity in soil mesocosm experiments. Tannin-enzyme synergy needs more study as these interactions can potentially play an important role in SOM decomposition of future climate, especially in the tannin-rich ecosystems. (C) 2016 Elsevier Ltd. All rights reserved.
The boreal forest ecosystem stores substantial amounts of soil organic matter (SOM), which may act either as a source or as a sink for atmospheric CO2 under climate change and that is why enzymatic SOM degradation is gaining increasing attention. The boreal forest ecosystem is rich in plant secondary compounds and in particular tannins which are seen as enzyme inhibitors. We studied changes in enzymatic activity after the addition of tannins. Our experimental design combined direct studies of the tannin effects on enzymes with laboratory soil mesocosm experiments. Our results showed that the addition of tannins directly led to both decreases and increases in the catalytic activity of enzymes, however, some differences between enzymes were observed. Overall, low concentrations of tannins increased the coiled structures of the enzymes boosting their catalytic activity. High concentrations of tannins acted in the opposite way, thereby diminishing the catalytic activity. We observed that tannins caused a similar change in enzymatic activity in soil mesocosm experiments. Tannin-enzyme synergy needs more study as these interactions can potentially play an important role in SOM decomposition of future climate, especially in the tannin-rich ecosystems. (C) 2016 Elsevier Ltd. All rights reserved.
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