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Stability and saturation of soil organic carbon in rice fields: evidence from a long-term fertilization experiment in subtropical China

文献类型： 外文期刊

作者： Sun, Yanni 1 ; Huang, Shan 2 ; Yu, Xichu 3 ; Zhang, Weijian 1 ;

作者机构： 1.Nanjing Agr Univ, Inst Appl Ecol, Nanjing 210095, Jiangsu, Peoples R China

2.Jiangxi Agr Univ, Dept Agron, Nanchang 330045, Peoples R China

3.Jiangxi Inst Red Soil, Jinxian 331700, Peoples R China

4.Chinese Acad Agr Sci, Key Lab Crop Physiol & Ecol, Minist Agr, Inst Crop Sci, Beijing 100081, Peoples R China

关键词： Carbon stability;Double-cropped rice;Organic amendments;Saturation;Soil organic carbon fractions

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.308； 五年影响因子：3.586 ）

ISSN： 1439-0108

年卷期： 2013 年 13 卷 8 期

页码：

收录情况： SCI

摘要： Soil organic carbon (SOC) sequestration in croplands plays a critical role in climate change mitigation and food security, whereas the stability and saturation of the sequestered SOC have not been well understood yet, particularly in rice (Oryza sativa L.) fields. The objective of this study was to determine the long-term effect of inorganic fertilization alone or combined with organic amendments on SOC stability in a double rice cropping system, and to characterize the saturation behavior of the total SOC and its fractions in the paddy soil. Soils were collected from a long-term field experiment in subtropical China where different fertilization regimes have been carried out for 31 years. The total SOC pool was separated into four fractions, characteristic of different turnover rates through chemical fractionation. Annual organic carbon (C) inputs were also estimated by determining the C content in crop residues and organic amendments. Relative to the initial level, long-term double rice cropping without any fertilizer application significantly increased SOC concentration, suggesting that double rice cropping facilitates the storage and accumulation of SOC. The partial substitution of inorganic fertilizers with organic amendments significantly increased total SOC concentration compared to the unfertilized control. Total SOC increased significantly with greater C inputs and did not show any saturation behavior. Increased SOC was primarily stored in the labile fraction with input from organic amendments. However, other less labile SOC fractions showed no further increase with greater C inputs exhibiting C saturation. While the paddy soil holds a high potential for SOC sequestration, stable C fractions saturate with increasing C inputs, and thus, additional C inputs mainly accumulate in labile soil C pools.

  • 相关文献

[1]Effects of organic amendments on soil carbon sequestration in paddy fields of subtropical China. Xu, Minggang,Wang, Xiujun,Wang, Xiujun,Huang, Qinhai,Nie, Jun,Li, Zuzhang,Li, Shuanglai,Hwang, Seon Woong,Lee, Kyeong Bo. 2012

[2]Effects of Long-Term Organic Amendments on Soil Organic Carbon in a Paddy Field: A Case Study on Red Soil. Huang Qing-hai,Li Da-ming,Liu Kai-lou,Yu Xi-chu,Ye Hui-cai,Hu Hui-wen,Xu Xiao-lin,Wang Sai-lian,Zhou Li-jun,Duan Ying-hua,Zhang Wen-ju. 2014

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