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Sensitivity of aggregate-associated soil organic carbon and total nitrogen to abandonment of paddy soil in subtropical China

文献类型： 外文期刊

作者： Chen, Anlei 1 ; Zhu, Baoli 2 ; Chen, Chunlan 2 ; Wei, Zhongwei 3 ; Ma, Guohui 1 ; Qin, Hongling 2 ; Hou, Haijun 2 ; Yi, Zhenxie 1 ;

作者机构： 1.Hunan Agr Univ, Coll Agron, Southern Reg Collaborat Innovat Ctr Grain & Oil Cr, Changsha 410128, Peoples R China

2.Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Peoples R China

3.Hunan Hybrid Rice Res Ctr, State Key Lab Hybrid Rice, Changsha 410125, Peoples R China

关键词： Paddy fields; Abandonment; Soil aggregates; Soil organic carbon; Soil total nitrogen; Stoichiometric stability

期刊名称：PLANT AND SOIL （ 影响因子：3.9； 五年影响因子：4.6 ）

ISSN： 0032-079X

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Background and Aims Abandonment of paddy fields is a significant threat to soil organic carbon (SOC) stocks owing to the associated shift from anaerobic to aerobic conditions. However, the impact of this transition on the dynamics of soil total nitrogen (TN) and its relationship with SOC in bulk soil and soil aggregates remains unclear. Methods A long-term experiment was conducted to examine abandoned paddy fields with different fertilizer treatments over a 16-year period before abandonment, followed by an 8-year period after abandonment. Results The abandonment of paddy fields led to a significant decrease in TN content by an average of 14.0%, resulting in a mean annual loss rate of 0.08 t N ha-1. The loss of TN was as sensitive as that of SOC, and there was a positive correlation between SOC and TN in both bulk soil and soil aggregates. The loss of SOC and TN was mainly caused by reductions in the middle- and micro-aggregate-associated SOC and TN, which together explained approximately 87.3% of C loss and 81.3% of N loss. The weaker protective capacity of soil aggregates (> 53 mu m) was evidenced by a significant decrease in aggregate-associated C (average of 8.7%) and N (average of 9.1%). Abandonment maintained stoichiometric stability, with bulk soil C:N ratios ranging from 9.4 to 9.6 following abandonment. Conclusions Paddy soil aggregate-associated SOC and TN were sensitive to loss owing to the weaker protective capacity of soil aggregates following the abandonment of paddy fields. The C:N ratios remained relatively consistent after abandonment.

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