Impact Factor4.189
DOI number:10.1002/2017MS000920
Journal:Journal of Advances in Modeling Earth Systems
Abstract:Microbial physiology plays a critical role in the biogeochemical cycles of the Earth system. How-ever, most traditional soil carbon models are lacking in terms of the representation of key microbial pro-cesses that control the soil carbon response to global climate change. In this study, the improved process-based model TRIPLEX-GHG was developed by coupling it with the new MEND (Microbial-ENzyme-mediatedDecomposition) model to estimate total global soil organic carbon (SOC) and global soil microbial carbon.The new model (TRIPLEX-MICROBE) shows considerable improvement over the previous version (TRIPLEX-GHG) in simulating SOC. We estimated the global soil carbon stock to be approximately 1195 Pg C, with 348Pg C located in the high northern latitudes, which is in good agreement with the well-regarded HarmonizedWorld Soil Database (HWSD) and the Northern Circumpolar Soil Carbon Database (NCSCD). We also esti-mated the global soil microbial carbon to be 21 Pg C, similar to the 23 Pg C estimated by Xu et al. (2014).We found that the microbial carbon quantity in the latitudinal direction showed reversions at approximately308N, near the equator and at 258S. A sensitivity analysis suggested that the tundra ecosystem exhibited thehighest sensitivity to a 18C increase or decrease in temperature in terms of dissolved organic carbon (DOC),microbial biomass carbon (MBC), and mineral-associated organic carbon (MOC). However, our work repre-sents the first step toward a new generation of ecosystem process models capable of integrating key micro-bial processes into soil carbon cycles.
Indexed by:Journal paper
Volume:9
Issue:6
Page Number:2368-2384
Translation or Not:no
Date of Publication:2017-10-01
Included Journals:SCI
First Author:Kefeng Wang
Correspondence Author:Changhui Peng
All the Authors:Qiuan Zhu
All the Authors:Xiaolu Zhou
All the Authors:Meng Wang
All the Authors:Kerou Zhang
All the Authors:Gangsheng Wang