Soil use affects soil organic carbon (OC) stocks by regulating the quantity and quality of incorporated organic matter. Understanding how soil texture and other factors control OC concentration and accumulation would be useful for designing sustainable soil management practices in order to promote and preserve OC storage. The aim of this work was to evaluate the effects of land use and soil texture on the vertical distribution and stock of OC in soils of the Argentinean Mesopotamia. In Entre Ríos Province, Argentina, the following sites were selected: native forest in a Typic Halacuept soil (fine to medium texture), agriculture and Eucalyptus grandis plantations of different ages (2–4 and 8–10 years) in Argic Peluderts soils (fine textures) and E. grandis plantations of different ages (2–4 and 8–10 years) in Oxic Udifluvents soils (coarse textures). OC concentration and stock were quantified up to 1 m depth, analysing distribution across the depth of the soil profile. The major differences in OC stock in equivalent mass were associated with texture; the average for coarse Oxic Udifluvents soils was 57.2 Mg OC ha⁻¹ and 162.3 Mg OC ha⁻¹ for Typic Halacuept and Argic Peluderts (fine to medium textures). Forest sites with fine textures stored three times more OC in equivalent mass than coarse textures under similar land use. No significant differences were observed between OC stock in equivalent mass in agricultural versus Eucalyptus plantations of similar texture. Sites with 8–10-year-old forest plantations in coarse soils were a special case, as they presented a great proportion of OC (60%) under 40 cm depth, due to a strong textural gradient with depth.

土壤利用通过调节掺入有机物质的数量和质量来影响土壤有机碳 (OC) 库。了解土壤质地和其他因素如何控制 OC 浓度和积累将有助于设计可持续的土壤管理实践，以促进和保护 OC 储存。这项工作的目的是评估土地利用和土壤质地对阿根廷美索不达米亚土壤中有机碳垂直分布和存量的影响。在阿根廷 Entre Ríos 省，选择了以下地点：典型 Halacuept 土壤中的原始森林（细到中等质地）、农业和 Argic Peluderts 土壤中不同年龄（2-4 年和 8-10 年）的大桉树种植园（质地细腻）和E. grandisOxic Udifluvents 土壤（粗糙质地）中不同年龄（2-4 年和 8-10 年）的种植园。OC 浓度和存量被量化到 1 m 深度，分析整个土壤剖面深度的分布。等量质量的 OC 储量的主要差异与质地有关；对于典型的 Halacuept 和 Argic Peluderts（细到中等质地），粗糙的 Oxic Udifluvents 土壤的平均值为 57.2 Mg OC ha ^-1和 162.3 Mg OC ha ^-1。在相似的土地利用情况下，具有精细纹理的森林站点在同等质量下存储的 OC 是粗糙纹理的三倍。在农业和桉树中的等量质量 OC 存量之间没有观察到显着差异类似质地的种植园。在粗土中拥有 8-10 年林龄的林地是一个特例，因为它们在 40 cm 深度以下表现出很大比例的 OC (60%)，这是由于随深度的强烈纹理梯度。