Rubber plant root-derived organic carbon influences aggregate stability through soil internal forces in tropical region

IF 6.8 1区农林科学 Q1 SOIL SCIENCE

Soil & Tillage Research Pub Date : 2025-09-17 DOI:10.1016/j.still.2025.106873

Waqar Ali , Xiuquan Wang , Zahid Ullah , Khurram Shehzad , Asad Shah , Hongyu Ran , Qiu Yang , Wenxian Xu , Wenxing Long , Jianxiong Huang , Huai Yang , Wenjie Liu , Zhixiang Wu

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引用次数: 0

Abstract

Soil organic carbon (SOC) from rubber plant roots enhances soil aggregate stability; however, the role of soil internal forces (SIFs), including electrostatic repulsive force (P_erf), van der Waals attractive force (P_vdw), and surface hydration repulsive force (P_h), remains unclear. This study investigated the effects of root characteristics, SOC, and root chemical composition on soil aggregate stability, focusing on the role of SIFs, by comparing rubber plantations of four distinct ages: 5-year-old (5Y_RP), 11-year-old (11Y_RP), 20-year-old (20Y_RP), and 27-year-old (27Y_RP). Among the rubber plants, 20Y_RP had the largest root diameter (RD) (0.88 mm) and root length density (RLD) (2.81 cm/cm³), along with a higher proportion of fine and medium roots, resulting in greater SOC (13.55 g/kg) and chemical composition (higher cellulose and lower lignin) than younger rubber plants. Greater SOC concentration of 20Y_RP resulted in a higher specific surface area (SSA) and lower surface charge density (σ_₀), surface charge number (Q_s), and surface potential (φ₀) compared to younger rubber plants, and the control, with significant correlations (r = 0.60 to 0.99) confirming the relationship between root traits, SOC, and soil surface charge properties. Consequently, older rubber plantations exhibited higher P_vdw, lower P_erf, and a decrease in the net repulsive force (P_net) (sum of three SIFs), with the average P_net in order of 20Y_RP (12.63 MPa) < MF (14.09 MPa) < 27Y_RP (14.22 MPa) < 11Y_RP (14.83 MPa) < 5Y_RP (15.59 MPa) < CK (24.57 MPa) at a 2 nm distance. Furthermore, the release of small particles (<20, <15, and <5 µm) from aggregates was lower in rubber plantations than in the control, showing that plant roots enhance SOC, chemical composition, and soil aggregate stability by reducing repulsive P_net. These results highlight the need to select rubber plants with optimal root traits to enhance soil structure and carbon sequestration, providing practical benefits for sustainable land management and long-term agricultural productivity in tropical areas.

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热带地区橡胶树根源有机碳通过土壤内力影响团聚体稳定性

橡胶树根系土壤有机碳（SOC）提高土壤团聚体稳定性；然而，土壤内力（SIFs）的作用，包括静电斥力（Perf）、范德华引力（Pvdw）和表面水化斥力（Ph），仍不清楚。以5年（5Y_RP）、11年（11Y_RP）、20年（20Y_RP）和27年（27Y_RP） 4个不同树龄的橡胶林为研究对象，研究了根系特征、有机碳和根系化学成分对土壤团聚体稳定性的影响，重点研究了SIFs的作用。其中，20Y_RP的根径（RD）和根长密度（RLD）最大（0.88 mm），根长密度（RLD）为2.81 cm/cm³，细根和中根比例较高，有机碳（13.55 g/kg）和化学成分（纤维素含量较高，木质素含量较低）均高于幼种。与对照相比，20Y_RP土壤有机碳浓度越高，比表面积（SSA）越高，表面电荷密度（σ 0）、表面电荷数（Qs）和表面电位（φ0）越低，且显著相关（r = 0.60 ~ 0.99），证实了根系性状、有机碳和土壤表面电荷特性之间的关系。因此,旧橡胶种植园展出Pvdw更高,性能较低,在减少净斥力(Pnet)(三个sif的总和),平均Pnet的20 y_rp(12.63 MPa) & lt; MF(14.09 MPa) & lt; 27 y_rp(14.22 MPa) & lt; 11 y_rp(14.83 MPa) & lt; 5 y_rp(15.59 MPa) & lt; CK(24.57 MPa) 2 海里距离。此外，橡胶林团聚体中小颗粒（<20, <；15和<；5 µm）的释放量低于对照，表明植物根系通过降低排斥性Pnet提高了土壤有机碳、化学成分和团聚体稳定性。这些结果表明，需要选择具有最佳根系性状的橡胶植物来改善土壤结构和碳固存，为热带地区的可持续土地管理和长期农业生产力提供实际效益。

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

Soil & Tillage Research 农林科学-土壤科学

CiteScore

13.00

自引率

6.20%

发文量

266

审稿时长

5 months

期刊介绍： Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.