气候变化领域集成服务门户(CCPortal): A Mechanistic Model of Microbially Mediated Soil Biogeochemical Processes: A Reality Check

CCPortal

DOI	10.1029/2018GB006077
	A Mechanistic Model of Microbially Mediated Soil Biogeochemical Processes: A Reality Check
	Fatichi S.; Manzoni S.; Or D.; Paschalis A.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	620
结束页码	648
卷号	33 期号:6
英文摘要	Present gaps in the representation of key soil biogeochemical processes such as the partitioning of soil organic carbon among functional components, microbial biomass and diversity, and the coupling of carbon and nutrient cycles present a challenge to improving the reliability of projected soil carbon dynamics. We introduce a new soil biogeochemistry module linked with a well-tested terrestrial biosphere model T&C. The module explicitly distinguishes functional soil organic carbon components. Extracellular enzymes and microbial pools are differentiated based on the functional roles of bacteria, saprotrophic, and mycorrhizal fungi. Soil macrofauna is also represented. The model resolves the cycles of nitrogen, phosphorus, and potassium. Model simulations for 20 sites compared favorably with global patterns of litter and soil stoichiometry, microbial and macrofaunal biomass relations with soil organic carbon, soil respiration, and nutrient mineralization rates. Long-term responses to bare fallow and nitrogen addition experiments were also in agreement with observations. Some discrepancies between predictions and observations are appreciable in the response to litter manipulation. Upon successful model reproduction of observed general trends, we assessed patterns associated with the carbon cycle that were challenging to address empirically. Despite large site-to-site variability, fine root, fungal, bacteria, and macrofaunal respiration account for 33%, 40%, 24%, and 3% on average of total belowground respiration, respectively. Simulated root exudation and carbon export to mycorrhizal fungi represent on average about 13% of plant net primary productivity. These results offer mechanistic and general estimates of microbial biomass and its contribution to respiration fluxes and to soil organic matter dynamics. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	manipulation experiments; microbes; modeling; soil carbon cycle; soil respiration; terrestrial ecosystems
语种	英语
scopus关键词	biogeochemistry; biomineralization; carbon cycle; decomposition; experimental study; exudation; litter; microbial activity; microbial community; organic carbon; soil microorganism; soil organic matter; soil respiration; Fungi
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129731
作者单位	Institute of Environmental Engineering, ETH Zurich, Zurich, Switzerland; Department of Physical Geography, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm, Sweden; Department of Environmental Science, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Zurich, Switzerland; Department of Civil and Environmental Engineering, Imperial College London, London, United Kingdom
推荐引用方式 GB/T 7714	Fatichi S.,Manzoni S.,Or D.,et al. A Mechanistic Model of Microbially Mediated Soil Biogeochemical Processes: A Reality Check[J],2019,33(6).
APA	Fatichi S.,Manzoni S.,Or D.,&Paschalis A..(2019).A Mechanistic Model of Microbially Mediated Soil Biogeochemical Processes: A Reality Check.Global Biogeochemical Cycles,33(6).
MLA	Fatichi S.,et al."A Mechanistic Model of Microbially Mediated Soil Biogeochemical Processes: A Reality Check".Global Biogeochemical Cycles 33.6(2019).