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Origin of Subsoil Carbon in a Chinese Paddy Soil Chronosequence

Published online by Cambridge University Press:  09 February 2016

Tino Bräuer ,
Pieter M Grootes  and
Marie-Josée Nadeau
Tino Bräuer*
Affiliation:
Leibniz-Laboratory, Christian-Albrechts-University zu Kiel, Germany
Pieter M Grootes
Affiliation:
Leibniz-Laboratory, Christian-Albrechts-University zu Kiel, Germany
Marie-Josée Nadeau
Affiliation:
Leibniz-Laboratory, Christian-Albrechts-University zu Kiel, Germany
*
1Corresponding author. Email: [email protected].
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Abstract

Rice paddies are highly important agricultural soils in view of their relevance as major staple food provider in the world and their key role in the global carbon cycle, caused by special management practices. A soil chronosequence, consisting of paddy and upland soils, developed on reclaimed estuarine sediments in the Province of Zhejiang, China, was sampled to investigate the influence of duration of agricultural use (50 to 2000 yr) on soil composition. The uniform composition of the parent material provides the unique opportunity to compare the effects of different land management practices (paddy and non-paddy) on soil carbon dynamics and the origin of organic carbon (OC) in top- and subsoils, using 14C measurements by accelerator mass spectrometry (AMS). The total soil organic carbon (TOC) was split into chemically defined pools of different mobility, namely the acid- and water-soluble fulvic acids (FA), the alkali-soluble humic acids (HA), and insoluble humin fraction. The more mobile HA and FA fractions contain significantly more 14C than the corresponding TOC and humin, indicating a downward transport of OC in the subsoil. Plant roots with 14C concentrations up to 128% of the modern standard, found far below the plough pan, reveal plant roots and root exudates as other direct sources of subsoil OC in paddy soils.

Type
Articles
Information
Radiocarbon , Volume 55 , Issue 2: Proceedings of the 21st International Radiocarbon Conference (Part 1 of 2) , 2013 , pp. 1058 - 1070
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

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