Vegetation restoration changed the soil aggregate stability and aggregate carbon stabilization pathway according to δ13C signatures

IF 6 1区农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY

Agriculture, Ecosystems & Environment Pub Date : 2024-10-03 DOI:10.1016/j.agee.2024.109317

Zhuoxia Su , Shu Zhu , Zhenhao Wei , Yanxing He , Bingqian Su , Kang Zhang , Xing Ma , Zhouping Shangguan

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引用次数: 0

Abstract

Vegetation restoration can increase soil organic carbon (SOC) sequestration through the physical protection of soil aggregates. However, the soil aggregate stability and C flow pathway associated with long-term plantation restoration have not yet been fully characterized. Here, we conducted a study on Robinia pseudoacacia plantations at different recovery stages, studied the distribution and stability of aggregates, analysed the aggregate-associated organic carbon (OC) content and δ¹³C value, and quantified the aggregate C flow pathway. The results revealed that vegetation restoration increased the proportion of large macroaggregates (LMAs) and decreased the proportion of small macroaggregates (SMAs), with no changes observed in the proportion of microaggregates (MIAs) or silt + clay (SC) at 0–20 cm. The indices of aggregate stability, namely, the mean weight diameter (MWD), geometric mean diameter (GMD) and structural stability index (SSI), increased under vegetation restoration at 0–20 cm, with maximum values of 3.83 mm, 2.88 mm, and 2.00 %, respectively, at 35 years of age (35Y). The OC content of the LMAs increased from 10.96 to 21.64 g kg⁻¹ and from 7.27 to 10.05 g kg⁻¹ in the 0–20 cm and 20–40 cm layers, respectively. LMAs and SMAs had the greatest contributions to SOC accumulation in the 0–20 cm and 20–40 cm layers, respectively. The δ¹³C value increased with decreasing aggregate size. The C flow pathway was from macroaggregates to MIAs or SC. Compared with abandoned farmland, vegetation restoration decreased the aggregate C flow intensity in the 0–20 cm layer. The soil aggregate stability and aggregate-associated OC content decreased with increasing soil depth, but the soil δ¹³C value exhibited the opposite trend. Vegetation restoration regulated soil aggregate stability by influencing the fine root biomass (FRB) and SOC content. In summary, our analysis offers a valuable reference for the controlling effect of aggregation on C stability influenced by vegetation restoration.

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根据 δ13C 信号，植被恢复改变了土壤团聚稳定性和团聚碳稳定途径

植被恢复可以通过对土壤团聚体的物理保护增加土壤有机碳（SOC）的固存。然而，与长期植被恢复相关的土壤团聚体稳定性和碳流动途径尚未得到充分表征。在此，我们对不同恢复阶段的刺槐人工林进行了研究，研究了聚合体的分布和稳定性，分析了与聚合体相关的有机碳（OC）含量和δ13C 值，并量化了聚合体碳流路径。结果表明，植被恢复增加了大型聚集体（LMAs）的比例，降低了小型聚集体（SMAs）的比例，0-20 厘米处的微聚集体（MIAs）和粉土+粘土（SC）的比例没有变化。骨料稳定性指数，即平均重量直径（MWD）、几何平均直径（GMD）和结构稳定性指数（SSI）在 0-20 厘米植被恢复条件下有所增加，35 年龄期（35Y）时的最大值分别为 3.83 毫米、2.88 毫米和 2.00%。在 0-20 厘米层和 20-40 厘米层，LMA 的 OC 含量分别从 10.96 克/千克增至 21.64 克/千克，从 7.27 克/千克增至 10.05 克/千克。LMA 和 SMA 分别对 0-20 厘米和 20-40 厘米层的 SOC 积累贡献最大。δ13C值随着骨料粒径的减小而增加。C的流动途径是从大集料到MIAs或SC。与废弃农田相比，植被恢复降低了 0-20 cm 土层的集料碳流强度。土壤团聚体稳定性和团聚体相关 OC 含量随土壤深度的增加而降低，但土壤 δ13C 值却呈现出相反的趋势。植被恢复通过影响细根生物量（FRB）和 SOC 含量来调节土壤团聚体稳定性。总之，我们的分析为植被恢复对C稳定性的聚合控制作用提供了有价值的参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Agriculture, Ecosystems & Environment 环境科学-环境科学

CiteScore

11.70

自引率

9.10%

发文量

392

审稿时长

26 days

期刊介绍： Agriculture, Ecosystems and Environment publishes scientific articles dealing with the interface between agroecosystems and the natural environment, specifically how agriculture influences the environment and how changes in that environment impact agroecosystems. Preference is given to papers from experimental and observational research at the field, system or landscape level, from studies that enhance our understanding of processes using data-based biophysical modelling, and papers that bridge scientific disciplines and integrate knowledge. All papers should be placed in an international or wide comparative context.