DOI: 10.1007/s10533-013-9920-7
Scopus记录号: 2-s2.0-84896388356
论文题名: Compound-specific 13C and 14C measurements improve the understanding of soil organic matter dynamics
作者: Mendez-Millan M. ; Nguyen Tu T.T. ; Balesdent J. ; Derenne S. ; Derrien D. ; Egasse C. ; Thongo M'Bou A. ; Zeller B. ; Hatté C.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 118, 期: 2018-01-03 起始页码: 205
结束页码: 223
语种: 英语
英文关键词: Molecular dynamics
; n-Alkanes
; PTMEs
Scopus关键词: alkane
; C3 plant
; C4 plant
; carbon isotope
; ester
; evergreen tree
; isotopic analysis
; measurement method
; molecular analysis
; savanna
; soil organic matter
; vegetation type
; Eucalyptus
英文摘要: Compound-specific isotopic analyses were used to assess the dynamics and origin of organic matter in soils across a 30 year chronosequence where native savanna (C4) had been replaced with eucalyptus (C3). Apolar lipid fractions were recovered from plants and soils planted with Eucalyptus 0, 7.5, 17 and 30 years ago. The molecular composition of lipids in plants and soils identified three major pentacyclic triterpene methyl esters (PTMEs) specific to savanna, and three odd n-alkanes common to both vegetation types. Savanna-derived PTMEs and δ13C remained at similar levels in soils after 30 years of eucalyptus growth. 14C content of PTMEs under savanna was lower than that of bulk soil and displayed the presence of older (1,000s of years) PTMEs in soils. However, the 14C content of soil PTMEs under eucalyptus was higher than that of the soil PTMEs under savanna. This suggests both recent (10s of years) and "pre-bomb" mineralization of savanna-derived PTMEs. Compound-specific 13C analyses of soil n-alkanes showed a trend typical of a C3/C4 vegetation shift, with more depleted δ13C values with increasing time under Eucalyptus. 14C analyses of n-alkanes suggest that n-alkanes have high turnover rates in the first few years after land conversion, and n-alkane composition thereafter is dominated by eucalyptus inputs. Compound-specific analyses reveal that lipids from past vegetations remained in soils. Compound-specific analyses allow a more nuanced description of carbon turnover in soils, and may improve our mechanistic understanding of soil organic carbon dynamics. © 2013 Springer Science+Business Media Dordrecht. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83694
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: LSCE, Domaine du CNRS, Bat. 12, 91198 Gif-sur-Yvette, France; CR2P, UMR 7207, MNHN-CNRS-UPMC, MNHN, CC 48, 57 rue Cuvier, 75231 Paris Cedex 05, France; BioEMCo UMR 7618, CNRS, UPMC, 4 place Jussieu, 75252 Paris Cedex 05, France; Géochimie des Sols et des Eaux, INRA, 13545 Aix en Provence Cedex 04, France; Biogéochimie des Ecosystèmes Forestiers, INRA, 54280 Champenoux, Nancy, France; Unité de Recherche sur la Productivité des Plantations Industrielles, IRD, BP 1291, Pointe-Noire, Congo
Recommended Citation:
Mendez-Millan M.,Nguyen Tu T.T.,Balesdent J.,et al. Compound-specific 13C and 14C measurements improve the understanding of soil organic matter dynamics[J]. Biogeochemistry,2014-01-01,118(2018-01-03)