水蚀对土壤团聚体有机碳矿化特征的影响研究

欧阳震; 方向华; 郭赓; 冯小红; 苏心; 彭健; 蔡威威; 季巍; 林杰

doi:10.12302/j.issn.1000-2006.202410020

欧阳震, 方向华, 郭赓, 冯小红, 苏心, 彭健, 蔡威威, 季巍, 林杰

南京林业大学学报（自然科学版） ›› 2026, Vol. 50 ›› Issue (3) : 141-149.

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南京林业大学学报（自然科学版） ›› 2026, Vol. 50 ›› Issue (3) : 141-149. DOI: 10.12302/j.issn.1000-2006.202410020

研究论文

水蚀对土壤团聚体有机碳矿化特征的影响研究

欧阳震 ¹ ,
方向华 ² ,
郭赓 ¹ ,
冯小红 ³ ,
苏心 ³ ,
彭健 ⁴ ,
蔡威威 ⁵ ,
季巍 ⁶ ,
林杰 ¹^,^*

作者信息 +

Research on the impact of water erosion on the mineralization characteristics of organic carbon in soil aggregates

OUYANG Zhen ¹ ,
FANG Xianghua ² ,
GUO Geng ¹ ,
FENG Xiaohong ³ ,
SU Xin ³ ,
PENG Jian ⁴ ,
CAI Weiwei ⁵ ,
JI Wei ⁶ ,
LIN Jie ¹^,^*

Author information +

文章历史 +

摘要

【目的】明确水蚀对土壤团聚体有机碳(SOC)矿化的作用机制,为土壤固碳能力提升提供理论基础。【方法】以南方红壤区典型侵蚀坡面土壤为研究对象,测定不同坡位各粒级土壤团聚体的SOC矿化特征,结合土壤团聚体SOC矿化的第一阶动力学模型参数,进一步分析影响土壤团聚体矿化的土壤理化因子。【结果】SOC累计矿化量在培养前7天增长迅速并在后期趋于稳定,呈现出沉积区(508.3 mg/kg)显著高于侵蚀区(328.2 mg/kg)。坡顶、坡脚处的矿化量显著高于坡中处。土壤大团聚体的SOC矿化贡献率(66.57%)显著高于微团聚体的(14.38%),潜在可矿化碳(C₀)和有机碳周转速率常数(k)呈现全土>大团聚体>微团聚体,且坡中处显著低于其他坡位。此外还观察到(0.25,2] mm团聚体含量与土壤团聚体SOC矿化量呈显著负相关关系。【结论】这些结果表明水蚀对土壤团聚体SOC矿化有显著影响,改变不同坡位的土壤有机质含量,加速土壤大团聚体向微团聚体的转变,促进了土壤团聚体SOC的矿化,而(0.25,2] mm团聚体含量和黏粒含量降低了土壤团聚体SOC的矿化量。

Abstract

【Objective】Clarifying the mechanism of water erosion on the mineralization of soil organic carbon (SOC) in soil aggregates is of great significance for enhancing soil carbon sequestration capacity.【Method】This study investigated the soil on eroded slopes in the southern red soil region, measuring the SOC mineralization characteristics of soil aggregates at different slope positions and different particle sizes. Combined with the first-order kinetic model parameters of soil aggregate SOC mineralization, further analysis of the soil factors affecting soil aggregate mineralization was conducted.【Result】The results indicated that the cumulative mineralization of soil organic carbon (SOC) increased rapidly within the first seven days of incubation and then stabilized, with significantly higher values in the deposition zone(508.3 mg/kg) compared to the erosion zone (328.2 mg/kg). The mineralization at the top of the slope and the bottom of the slope were significantly higher than that in the middle of the slope. The contribution of SOC mineralization from soil macro-aggregates (66.57%) was significantly higher than that from micro-aggregates (14.38%). The C₀ and k values showed a trend of bulk soil > macro-aggregates > micro-aggregates, and the values at the middle slope position were significantly lower than those at other slope positions. Additionally, a significant negative correlation was observed between the content of (0.25,2] mm aggregates and the mineralization of SOC in soil aggregates.【Conclusion】The study demonstrates that water erosion significantly affects the mineralization of SOC in soil aggregates, enriching soil organic matter in the deposition zone, accelerating the transformation of soil macro-aggregates into micro-aggregates, and promoting the mineralization of SOC in soil aggregates. Meanwhile, the content of (0.25,2]mm aggregates and clay particles reduced the mineralization of SOC in soil aggregates.

导出引用

欧阳震, 方向华, 郭赓, 等. 水蚀对土壤团聚体有机碳矿化特征的影响研究[J]. 南京林业大学学报（自然科学版）. 2026, 50(3): 141-149 https://doi.org/10.12302/j.issn.1000-2006.202410020

OUYANG Zhen, FANG Xianghua, GUO Geng, et al. Research on the impact of water erosion on the mineralization characteristics of organic carbon in soil aggregates[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2026, 50(3): 141-149 https://doi.org/10.12302/j.issn.1000-2006.202410020

中图分类号： Q148;S714

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