DOI: 10.1002/2014GL061328
论文题名: Leaf wax biomarkers in transit record river catchment composition
作者: Ponton C. ; West A.J. ; Feakins S.J. ; Galy V.
刊名: Geophysical Research Letters
ISSN: 0094-9774
EISSN: 1944-9505
出版年: 2014
卷: 41, 期: 18 起始页码: 6420
结束页码: 6427
语种: 英语
英文关键词: Amazon
; biomarkers
; erosion
; fluvial transport
; hydrogen isotopes
; paleoclimate
Scopus关键词: Biomarkers
; Erosion
; Forestry
; Hydrogen
; Isotopes
; Molecules
; Rivers
; Runoff
; Sedimentology
; Vegetation
; Amazon
; Environmental variability
; Fluvial transport
; Hydrogen isotope
; Hydrogen isotopic composition
; Paleoclimates
; Spatial interpretation
; Tropical montane forest
; Catchments
; biomarker
; carbon cycle
; carboxylic acid
; catchment
; erosion
; hydrogen isotope
; isotopic composition
; molecular analysis
; montane forest
; organic matter
; paleoclimate
; precipitation (climatology)
; proxy climate record
; rainforest
; river
; timescale
; topography
; Andes
; Madre de Dios River
英文摘要: Rivers carry organic molecules derived from terrestrial vegetation to sedimentary deposits in lakes and oceans, storing information about past climate and erosion, as well as representing a component of the carbon cycle. It is anticipated that sourcing of organic matter may not be uniform across catchments with substantial environmental variability in topography, vegetation zones, and climate. Here we analyze plant leaf wax biomarkers in transit in the Madre de Dios River (Peru), which drains a forested catchment across 4.5 km of elevation from the tropical montane forests of the Andes down into the rainforests of Amazonia. We find that the hydrogen isotopic composition of leaf wax molecules (specifically the C28 n-alkanoic acid) carried by this tropical mountain river largely records the elevation gradient defined by the isotopic composition of precipitation, and this supports the general interpretation of these biomarkers as proxy recorders of catchment conditions. However, we also find that leaf wax isotopic composition varies with river flow regime over storm and seasonal timescales, which could in some cases be quantitatively significant relative to changes in the isotopic composition of precipitation in the past. Our results inform on the sourcing and transport of material by a major tributary of the Amazon River and contribute to the spatial interpretation of sedimentary records of past climate using the leaf wax proxy. Key Points Biomarkers in transit reflect precipitation throughout the river catchmentTerrestrial biomarkers integrate sources over the entire studied river catchmentLeaf waxes work well in fluvial systems as hydrological proxies ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911444567&doi=10.1002%2f2014GL061328&partnerID=40&md5=c583b2c655b4d9e0fdf0ca402cbe6868
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7038
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States
Recommended Citation:
Ponton C.,West A.J.,Feakins S.J.,et al. Leaf wax biomarkers in transit record river catchment composition[J]. Geophysical Research Letters,2014-01-01,41(18).