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Environmental Controls on Leaf Wax Δd Ratios in Surface Peats Across the Monsoonal Region of China : Volume 12, Issue 17 (14/09/2015)

By Huang, X.

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Book Id: WPLBN0004023613
Format Type: PDF Article :
File Size: Pages 28
Reproduction Date: 2015

Title: Environmental Controls on Leaf Wax Δd Ratios in Surface Peats Across the Monsoonal Region of China : Volume 12, Issue 17 (14/09/2015)  
Author: Huang, X.
Volume: Vol. 12, Issue 17
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Wang, X., Huang, X., Meyers, P. A., & Xue, J. (2015). Environmental Controls on Leaf Wax Δd Ratios in Surface Peats Across the Monsoonal Region of China : Volume 12, Issue 17 (14/09/2015). Retrieved from http://www.hawaiilibrary.net/


Description
Description: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China. Leaf wax molecular and isotopic ratios are generally considered robust isotopic paleohydrologic proxies. Here we evaluate the proxy value of the molecular distributions and hydrogen isotopic compositions of long chain n-alkanes (ΔDalk) in surface peats collected from peatlands across a range of annual air temperatures from 1 to 15 °C and a range of annual mean precipitation from 720 to 2070 mm in the monsoonal region of China. The alkane ratios (ACL and CPI) and ΔDalk values show relatively large variations in multiple samples from a single site, highlighting the complexity of these ratios at a small spatial scale. In the montane Zoigê peatland, the apparent fractionation between precipitation and ΔDalk is more positive than in the other six sites, which is possibly an effect of the higher conductivity of the water in this high elevation site (3500 m a.s.l.). At a larger spatial scale, the site-averaged CPI ratios and the ΔDalk values of n-C29 and n-C31 alkanes show significant correlation with the air temperature and precipitation. These results support the application of the CPI ratio and the ΔDalk ratios of n-C29 and n-C31 alkanes as sensitive paleohydrologic proxies on millennial and larger timescales.

Summary
Environmental controls on leaf wax ΔD ratios in surface peats across the monsoonal region of China

Excerpt
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