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      Interactions among decaying leaf litter, root litter and soil organic matter vary with mycorrhizal type

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          Plant species traits are the predominant control on litter decomposition rates within biomes worldwide.

          Worldwide decomposition rates depend both on climate and the legacy of plant functional traits as litter quality. To quantify the degree to which functional differentiation among species affects their litter decomposition rates, we brought together leaf trait and litter mass loss data for 818 species from 66 decomposition experiments on six continents. We show that: (i) the magnitude of species-driven differences is much larger than previously thought and greater than climate-driven variation; (ii) the decomposability of a species' litter is consistently correlated with that species' ecological strategy within different ecosystems globally, representing a new connection between whole plant carbon strategy and biogeochemical cycling. This connection between plant strategies and decomposability is crucial for both understanding vegetation-soil feedbacks, and for improving forecasts of the global carbon cycle.
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            The Microbial Efficiency-Matrix Stabilization (MEMS) framework integrates plant litter decomposition with soil organic matter stabilization: do labile plant inputs form stable soil organic matter?

            The decomposition and transformation of above- and below-ground plant detritus (litter) is the main process by which soil organic matter (SOM) is formed. Yet, research on litter decay and SOM formation has been largely uncoupled, failing to provide an effective nexus between these two fundamental processes for carbon (C) and nitrogen (N) cycling and storage. We present the current understanding of the importance of microbial substrate use efficiency and C and N allocation in controlling the proportion of plant-derived C and N that is incorporated into SOM, and of soil matrix interactions in controlling SOM stabilization. We synthesize this understanding into the Microbial Efficiency-Matrix Stabilization (MEMS) framework. This framework leads to the hypothesis that labile plant constituents are the dominant source of microbial products, relative to input rates, because they are utilized more efficiently by microbes. These microbial products of decomposition would thus become the main precursors of stable SOM by promoting aggregation and through strong chemical bonding to the mineral soil matrix. © 2012 Blackwell Publishing Ltd.
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              Nitrogen and Lignin Control of Hardwood Leaf Litter Decomposition Dynamics

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                Author and article information

                Journal
                Journal of Ecology
                J Ecol
                Wiley
                00220477
                March 2018
                March 2018
                February 13 2018
                : 106
                : 2
                : 502-513
                Affiliations
                [1 ]Department of Biology; Indiana University; Bloomington IN USA
                [2 ]Program in Atmospheric and Oceanic Sciences; Princeton University; Princeton NJ USA
                [3 ]Department of Biology; West Virginia University; Morgantown WV USA
                Article
                10.1111/1365-2745.12921
                7942ead7-3a6f-42c0-8dc2-ab4fdc408a7f
                © 2018

                http://doi.wiley.com/10.1002/tdm_license_1.1

                http://onlinelibrary.wiley.com/termsAndConditions#am

                http://onlinelibrary.wiley.com/termsAndConditions#vor

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