DOI: 10.1007/s10533-014-0027-6
Scopus记录号: 2-s2.0-84918528008
论文题名: The soil matrix increases microbial C stabilization in temperate and tropical forest soils
作者: Throckmorton H.M. ; Bird J.A. ; Monte N. ; Doane T. ; Firestone M.K. ; Horwath W.R.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 122, 期: 1 起始页码: 35
结束页码: 45
语种: 英语
英文关键词: Bacteria
; Carbon
; Fungi
; Microorganisms
; Mineral protection
; Soil organic matter
; Stabilization
Scopus关键词: biomass
; forest soil
; soil microorganism
; soil nutrient
; soil organic matter
; soil stabilization
; tropical forest
; California
; Puerto Rico
; United States
; Actinobacteria
; Bacteria (microorganisms)
; Fungi
; Negibacteria
; Posibacteria
英文摘要: Microbial biomass represents a substantial source of labile C contributing to soil organic matter (SOM) maintenance. Microbial residues may associate with the soil matrix through a variety of mechanisms, reducing its bioavailability and increasing its persistence in soil. Our objective was to examine soil matrix effects on the stability of non-living microbial C inputs in two contrasting forest ecosystems by following microbial residues (Fungi, Actinobacteria, Gram-positive bacteria (Gm +), Gram-negative bacteria (Gm −)) into SOM fractions in a temperate forest in California (CA) and a tropical forest in Puerto Rico (PR) for 3 and 2 years, respectively. We isolated 3 SOM fractions: (i) free light fraction (FLF), (ii) occluded light fraction (OLF), and (iii) dense fraction (DF). Additionally, we characterized SOM fraction chemistry to infer quality and source of native fraction SOM. Our results showed greater stabilization as mineral-associated microbial C (i.e., as DF and OLF), compared with loose detrital C (i.e., FLF). There was no microbial group effect (i.e., differences in fraction C recovery among different microbial cell types). Our findings suggest that mineral association is more important for stabilizing non-living microbial C in soil than the cellular structure of the initial source of microbial inputs, with site specific edaphic factors as the major controllers of the amount of microbial residues stabilized. © 2014, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83530
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Los Alamos National Lab, MS 495, Los Alamos, NM, United States; Queens College CUNY, 65-30 Kissena Blvd, Flushing, NY, United States; University of California, One Shields Ave, Davis, CA, United States; University of California, 137 Mulford Hall, Berkeley, Berkeley, CA, United States
Recommended Citation:
Throckmorton H.M.,Bird J.A.,Monte N.,et al. The soil matrix increases microbial C stabilization in temperate and tropical forest soils[J]. Biogeochemistry,2015-01-01,122(1)