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Plant Secondary Metabolites—Missing Pieces in the Soil Organic Matter Puzzle of Boreal Forests

1
Department of Food and Environmental Sciences, University of Helsinki, PO Box 66, 00014 Helsinki, Finland
2
Natural Resources Institute Finland, PL 2, 00791 Helsinki, Finland
3
Plant Interactions Ecophysiology Group, Department of Biology, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany
*
Author to whom correspondence should be addressed.
Soil Syst. 2018, 2(1), 2; https://doi.org/10.3390/soils2010002
Received: 9 December 2017 / Revised: 25 December 2017 / Accepted: 29 December 2017 / Published: 8 January 2018
(This article belongs to the Special Issue Soil Organic Matter Dynamics)
Processes underlying soil organic matter (SOM) transformations are meeting growing interest as SOM contains more carbon (C) than global vegetation and the atmosphere combined. Therefore, SOM is a crucial element of the C cycle, especially in ecosystems rich in organic matter, such as boreal forests. However, climate change may shift the fate of this SOM from C sink into C source, accelerating global warming. These processes require a better understanding of the involved mechanisms driving both the C cycle and the interlinked nitrogen (N) cycle. SOM transformations are balanced by a network of interactions between biological, chemical and physical factors. In this review, we discuss the findings of the most recent studies to the current state of knowledge about the main drivers in SOM transformations. We focus on plant-derived secondary metabolites, as their biochemical traits, especially interactions with soil microbial communities, organic N compounds and enzymes make them potential regulators of SOM decomposition. However, these regulatory abilities of plant-derived compounds are not fully explored. View Full-Text
Keywords: enzymatic activity; forest soil; tannins; terpenes enzymatic activity; forest soil; tannins; terpenes
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Adamczyk, B.; Adamczyk, S.; Smolander, A.; Kitunen, V.; Simon, J. Plant Secondary Metabolites—Missing Pieces in the Soil Organic Matter Puzzle of Boreal Forests. Soil Syst. 2018, 2, 2.

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