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10Be, 14C Distribution, and Soil Production Rate in a Soil Profile of a Grassland Slope at Heshan Hilly Land, Guangdong

Published online by Cambridge University Press:  18 July 2016

CD Shen ,
J Beer ,
S Ivy-Ochs ,
Y Sun ,
W Yi ,
P W Kubik ,
M Suter ,
Z Li ,
S Peng  and
Y Yang
CD Shen*
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
J Beer
Affiliation:
Swiss Federal Institute of Environmental Science and Technology, EAWAG, CH-8600 Dübendorf, Switzerland.
S Ivy-Ochs
Affiliation:
Particle Physics, ETH-Hönggerberg, CH-8093 Zürich, Switzerland.
Y Sun
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
W Yi
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
P W Kubik
Affiliation:
Paul Scherrer Institute, c/o ETH-Hönggerberg, CH-8093 Zürich, Switzerland.
M Suter
Affiliation:
Particle Physics, ETH-Hönggerberg, CH-8093 Zürich, Switzerland.
Z Li
Affiliation:
South China Institute of Botany, Chinese Academy of Sciences, Guangzhou 510640, China.
S Peng
Affiliation:
Paul Scherrer Institute, c/o ETH-Hönggerberg, CH-8093 Zürich, Switzerland.
Y Yang
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
*
Corresponding author. Email: [email protected].
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Abstract

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Concentrations of organic carbon, carbon isotopes (13C and 14C), atmospheric 10Be in soil, and in situ 10Be in bedrock and weathering rock were determined in a study of a profile of a grassland slope at the Heshan Hilly Land Interdisciplinary Experimental Station, Chinese Academy of Sciences, in Guangdong Province, China. A good linear relationship between depth and the 14C apparent age of the organic carbon demonstrates that the rock weathering process and the accumulation process of organic matter in the slope are relatively stable. Both 14C and 10Be results show that about 34% of soil in the grassland slope has been eroded during the past 3800 yr. The 10Be results for interstitial soil from weathered rocks show that the 90-cm-thick weathering rock layer above the bedrock has evolved over a period of 1.36 Myr. The concentrations of in situ 10Be in the weathered rock and bedrock are 10.7 × 104 atoms/g and 8.31 × 104 atoms/g, respectively. The weathering rate of the bedrock, equivalent to the soil production rate, was estimated at 8.8 × 10-4 cm/yr, and the exposure ages of the weathered rock and the bedrock were 72 kyr and 230 kyr, respectively.

Type
Articles
Information
Radiocarbon , Volume 46 , Issue 1: Proceedings of the 18th International Radiocarbon Conference (Part 1 of 2), Conference Editors: Nancy Beavan Athfield, Rodger J Sparks , 2004 , pp. 445 - 454
Copyright
Copyright © 2004 by the Arizona Board of Regents on behalf of the University of Arizona 

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