Assessing the accumulation efficiency of various microbial carbon components in soils of different minerals

doi:10.1016/j.geoderma.2021.115562

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	Assessing the accumulation efficiency of various microbial carbon components in soils of different minerals
	Cai, Yue 1; Ma, Tian 4; Wang, Yiyun 1; Jia, Juan ; Jia, Yufu ; Liang, Chao 3; Feng, Xiaojuan 1
刊名	GEODERMA
	2022
卷号	407
关键词	Microbial carbon pump Amino sugar Metabolic quotient(qCO(2)) Clay content Iron (hydr)oxide
ISSN号	0016-7061
DOI	10.1016/j.geoderma.2021.115562
文献子类	Article
英文摘要	Heterotrophic soil microbes are increasingly recognized as a key mediator transforming labile organic carbon (OC) into relatively stable soil carbon (C) in the form of microbial necromass (dead cells) and extracellular compounds associated with minerals. However, the accumulation of microbial necromass relative to labile OC consumption and its regulating factors remain poorly understood, although it has vital implications for soil C sequestration and modeling. Here by mimicking microbial C accumulation in constructed model soils using fructose as the sole OC substrate, we present a benchmark comparison of microbial C accrual versus OC mineralization under declining substrate availability and mineralogy. By quantifying various microbial components including biomass (living cells; indicated by phospholipid fatty acids), necromass (indicated by amino sugars) and total microbial C (including biomass, necromass and extracellular compounds; estimated as the difference between added and residual substrate C minus respiration) in a simple soil system, we compare microbial metabolic quotient (qCO2; i.e., microbial respiration rate per unit of biomass), amino sugar accumulation efficiency (AAE; i.e., ratio of amino sugars to respiration) and microbial C accumulation efficiency (mCAE; i.e., ratio of total microbial C to total microbial C and respiration), and assess their regulating factors. We find that while clay (bentonite) promotes microbial respiration, it enhances the rate as well as efficiency of amino sugar accumulation without affecting qCO2 or mCAE. On the contrary, ferrihydrite increases qCO2 and decreases AAE but promotes labile OC preservation via inhibiting microbial growth in the alkaline model soil. Hence, amino sugar accrual is more efficient in clay-rich model soils while labile OC is less consumed in model soils containing iron (hydr)oxide. Furthermore, while mCAE was correlated with qCO2 in all but the model soil with 6% clay, AAE was correlated with qCO2 only in model soils with 12% clay when the mineral treatments were considered separately. Collectively, our findings suggest that mCAE and AAE heavily depend on mechanisms preserving microbial C components but not solely on the metabolic efficiency and is mediated by soil mineral content as well as composition. Parameters considering microbial C preservation such as mCAE or AAE warrant further study for modelling and managing the formation of microbial derived stable soil OC.
学科主题	Soil Science
电子版国际标准刊号	1872-6259
出版地	AMSTERDAM
WOS关键词	ORGANIC-CARBON ; COMMUNITY STRUCTURE ; MURAMIC ACID ; PLANT INPUTS ; CLAY CONTENT ; FOREST ; DECOMPOSITION ; BACTERIAL ; TURNOVER ; MATTER
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000725510200011
资助机构	Chinese Academy of Sciences K.C. Wong Education Foundation [GJTD-2019-10] ; National Natural Science Foundation of China [31988102, 42103028, 42025303, 41807329]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/28938]
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China 3.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland & Agroecosyst, Lanzhou 730020, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Cai, Yue,Ma, Tian,Wang, Yiyun,et al. Assessing the accumulation efficiency of various microbial carbon components in soils of different minerals[J]. GEODERMA,2022,407.
APA	Cai, Yue.,Ma, Tian.,Wang, Yiyun.,Jia, Juan.,Jia, Yufu.,...&Feng, Xiaojuan.(2022).Assessing the accumulation efficiency of various microbial carbon components in soils of different minerals.GEODERMA,407.
MLA	Cai, Yue,et al."Assessing the accumulation efficiency of various microbial carbon components in soils of different minerals".GEODERMA 407(2022).