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A keystone microbial enzyme for nitrogen control of soil carbon storage.


ABSTRACT: Agricultural and industrial activities have increased atmospheric nitrogen (N) deposition to ecosystems worldwide. N deposition can stimulate plant growth and soil carbon (C) input, enhancing soil C storage. Changes in microbial decomposition could also influence soil C storage, yet this influence has been difficult to discern, partly because of the variable effects of added N on the microbial enzymes involved. We show, using meta-analysis, that added N reduced the activity of lignin-modifying enzymes (LMEs), and that this N-induced enzyme suppression was associated with increases in soil C. In contrast, N-induced changes in cellulase activity were unrelated to changes in soil C. Moreover, the effects of added soil N on LME activity accounted for more of the variation in responses of soil C than a wide range of other environmental and experimental factors. Our results suggest that, through responses of a single enzyme system to added N, soil microorganisms drive long-term changes in soil C accumulation. Incorporating this microbial influence on ecosystem biogeochemistry into Earth system models could improve predictions of ecosystem C dynamics.

SUBMITTER: Chen J 

PROVIDER: S-EPMC6105232 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature

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A keystone microbial enzyme for nitrogen control of soil carbon storage.

Chen Ji J   Luo Yiqi Y   van Groenigen Kees Jan KJ   Hungate Bruce A BA   Cao Junji J   Zhou Xuhui X   Wang Rui-Wu RW  

Science advances 20180822 8


Agricultural and industrial activities have increased atmospheric nitrogen (N) deposition to ecosystems worldwide. N deposition can stimulate plant growth and soil carbon (C) input, enhancing soil C storage. Changes in microbial decomposition could also influence soil C storage, yet this influence has been difficult to discern, partly because of the variable effects of added N on the microbial enzymes involved. We show, using meta-analysis, that added N reduced the activity of lignin-modifying e  ...[more]

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