Michaelis-Menten kinetics of soil respiration feedbacks to nitrogen deposition and climate change in subtropical forests

Scientific Reports
Jennifer EberweinG Darrel Jenerette

Abstract

China experiences some of the highest rates of anthropogenic nitrogen deposition globally, with further increases projected. Understanding of soil feedbacks to the combined anthropogenic influences of climate change and nitrogen deposition in these systems is critical to improve predictive abilities for future climate scenarios. Here we used a Michaelis-Menten substrate-based kinetics framework to explore how soil CO2 production (Rsoil) responds to changes in temperature and available soil nitrogen (N) by combining field experiments with laboratory manipulations from sites experiencing elevated rates of anthropogenic N deposition but varying in soil N availabiltiy. The temperature sensitivity of Rsoil was strongly influenced by labile C additions. Furthermore, estimation of the temperature response of the Michaelis-Menten parameters supports the use of substrate-based kinetics in modeling efforts. Results from both field and laboratory experiments demonstrated a general decrease in Rsoil with increasing soil available N that was variably dependent on carbon (C) availability. Both the field and the laboratory measurements demonstrated a consistent decrease in the Michaelis-Menten parameter kM with increasing soil available N, in...Continue Reading

References

Sep 11, 2007·Ecology·Joseph M CraineNoah Fierer
Aug 2, 2008·Science·Stefano ManzoniAmilcare Porporato
May 21, 2010·Ecology Letters·Lingli Liu, Tara L Greaver
Sep 11, 2010·Environmental Pollution·Xuejun LiuFusuo Zhang
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May 1, 2013·Ecology Letters·Robert L SinsabaughAndreas Richter
Oct 21, 2014·Global Change Biology·Yiqi LuoMatthew Smith

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Citations

Dec 10, 2019·The Science of the Total Environment·Yi WangXiaojing Liu

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Software Mentioned

lme4
Matlab
R
multcomp

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