Temporal changes in soil organic carbon contents and delta C-13 values under long-term maize-wheat rotation systems with various soil and climate conditions

文献类型： 外文期刊

第一作者： Tang, Xu

作者： Tang, Xu;Ellert, Benjamin H.;Hao, Xiying;Nakonechny, Elaine;Ma, Yibing;Li, Jumei

作者机构：

关键词： Soil organic carbon;delta C-13;Carbon cycling;Maize;Wheat

期刊名称：GEODERMA （ 影响因子：6.114； 五年影响因子：6.183 ）

ISSN： 0016-7061

年卷期： 2012 年 183 卷

页码：

收录情况： SCI

摘要： Understanding soil organic carbon (SOC) decomposition and its replenishment by contrasting plant residues is critical to rationally manage soil carbon pools. Long-term (15 years) field experiments in maize-wheat (Zea mays L-Triticum aestivum L) rotation systems at diverse sites with contrasting climates and soil properties were conducted to evaluate the temporal dynamics of the C inputs, SOC concentrations and delta C-13 values. In the non-fertilized Control treatments mean annual C inputs (mainly roots) at the various sites ranged from 0.39 to 1.24 Mg ha(-1), and SOC contents remained largely unchanged during the 15 years study. However, results for the fertilized treatments indicated that SOC concentration increased by 1 g kg(-1) for every 24.3 (5.4-45.2) Mg C ha(-1) from roots alone in the NPK treatment and for every 29.4 (11.1-52.6) Mg C ha(-1) from crop roots plus straws in the NPKSt treatment. Furthermore, there was a positive correlation among changes in SOC, C-4-derived C and C-3-derived C and the delta C-13 values in all treatments across the four sites. Our results suggest that the delta C-13 value was a useful tool to quantify temporal changes of SOC from C-4 and C-3 plants, even when actual changes in soil C stock were small in these wheat-maize rotation cropping systems. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.

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