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<p>Highly weathered Oxisols of the Colombian Llanos piedmont support extensive cattle ranching, yet field evidence on how pasture degradation, pasture improvement, and tree-based grazing affect soil fertility and soil organic carbon (SOC) storage along the profile remains limited. We assessed soil physicochemical properties and SOC stocks under three contrasting grazing systems: degraded pasture (DP), improved pasture (IP), and a silvopastoral system (SPS). Soils were sampled under three grazing systems using six composite sampling points per system at each of two depths (0–0.30 and 0.30–0.60&#xa0;m), for a total of 36 samples.. Across systems, soils were strongly acidic (pH 4.4–4.8) with high exchangeable acidity and low exchangeable bases, indicating an intrinsic fertility constraint typical of these highly weathered soils. Management effects were expressed mainly in the most dynamic attributes; in particular, P<sub>avail</sub> remained low in DP and IP (3.6–10.9&#xa0;mg&#xa0;kg<sup>−1</sup>) but increased in SPS (34&#xa0;mg&#xa0;kg<sup>−1</sup>) to 0.30–0.60&#xa0;m, consistent with localized enrichment in tree–grass mosaics. SOC stocks to 0–0.60&#xa0;m were high but highly variable (DP: 115.9 ± 37.8; IP: 135.4 ± 25.8; SPS: 148.5 ± 58.9&#xa0;Mg C ha⁻<sup>1</sup>; mean ± SD), and depth-stratified tests detected no significant differences among systems. Correlation patterns highlighted SOC as a central driver of physical condition and nutrient availability. This depth-resolved assessment provides a baseline for the Colombian Llanos to supports management decisions aimed at improving soil fertility functioning and climate-regulation services in tropical grazing landscapes.</p>

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Soil fertility and carbon stocks in contrasting tropical grazing systems on Oxisols of the Colombian Llanos piedmont

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月13日

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  • Juan Manuel Trujillo-González,
  • Amanda Silva-Parra,
  • Marco Aurelio Torres-Mora

摘要

Highly weathered Oxisols of the Colombian Llanos piedmont support extensive cattle ranching, yet field evidence on how pasture degradation, pasture improvement, and tree-based grazing affect soil fertility and soil organic carbon (SOC) storage along the profile remains limited. We assessed soil physicochemical properties and SOC stocks under three contrasting grazing systems: degraded pasture (DP), improved pasture (IP), and a silvopastoral system (SPS). Soils were sampled under three grazing systems using six composite sampling points per system at each of two depths (0–0.30 and 0.30–0.60 m), for a total of 36 samples.. Across systems, soils were strongly acidic (pH 4.4–4.8) with high exchangeable acidity and low exchangeable bases, indicating an intrinsic fertility constraint typical of these highly weathered soils. Management effects were expressed mainly in the most dynamic attributes; in particular, Pavail remained low in DP and IP (3.6–10.9 mg kg−1) but increased in SPS (34 mg kg−1) to 0.30–0.60 m, consistent with localized enrichment in tree–grass mosaics. SOC stocks to 0–0.60 m were high but highly variable (DP: 115.9 ± 37.8; IP: 135.4 ± 25.8; SPS: 148.5 ± 58.9 Mg C ha⁻1; mean ± SD), and depth-stratified tests detected no significant differences among systems. Correlation patterns highlighted SOC as a central driver of physical condition and nutrient availability. This depth-resolved assessment provides a baseline for the Colombian Llanos to supports management decisions aimed at improving soil fertility functioning and climate-regulation services in tropical grazing landscapes.