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      Mineral protection of soil carbon counteracted by root exudates

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          Review of mechanisms and quantification of priming effects

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            Large-scale forest girdling shows that current photosynthesis drives soil respiration.

            The respiratory activities of plant roots, of their mycorrhizal fungi and of the free-living microbial heterotrophs (decomposers) in soils are significant components of the global carbon balance, but their relative contributions remain uncertain. To separate mycorrhizal root respiration from heterotrophic respiration in aboreal pine forest, we conducted a large-scale tree-girdling experiment, comprising 9 plots each containing about 120 trees. Tree-girdling involves stripping the stem bark to the depth of the current xylem at breast height terminating the supply of current photosynthates to roots and their mycorrhizal fungi without physically disturbing the delicate root-microbe-soil system. Here we report that girdling reduced soil respiration within 1-2 months by about 54% relative to respiration on ungirdled control plots, and that decreases of up to 37% were detected within 5 days. These values clearly show that the flux of current assimilates to roots is a key driver of soil respiration; they are conservative estimates of root respiration, however, because girdling increased the use of starch reserves in the roots. Our results indicate that models of soil respiration should incorporate measures of photosynthesis and of seasonal patterns of photosynthate allocation to roots.
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              The priming effect of organic matter: a question of microbial competition?

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                Author and article information

                Journal
                Nature Climate Change
                Nature Clim Change
                Springer Nature
                1758-678X
                1758-6798
                June 2015
                March 30 2015
                : 5
                : 6
                : 588-595
                Article
                10.1038/nclimate2580
                4730fc3d-0038-44e4-9fb1-afe8b7dc5e70
                © 2015

                http://www.springer.com/tdm

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