Factors regarding the spatial variability of soil organic carbon in a Mexican small watershed

Revista de la Facultad de Agronomía, Universidad del Zulia Pub Date : 2023-12-15 DOI:10.47280/revfacagron(luz).v41.n1.01

Olimpya Aguirre-Salado, Joel Pérez-Nieto, C. Aguirre-Salado, A. Monterroso-Rivas

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Abstract

Understanding the stocks of Soil Organic Carbon (SOC) and elucidating the variables influencing its spatial distribution within a small watershed are imperative for advancing targeted climate change mitigation strategies, specifically directed toward soil and water conservation. The selection of this watershed is predicated upon its three-decade-long implementation of diverse soil and water conservation practices. Therefore, the objective of this study was to analyze land use, vegetation cover, slope and soil and water conservation practices (SCWP) as factors that influence the variability and spatial distribution of soil organic carbon in a small basin in the Mixteca Alta region of the state of Oaxaca. Mexico. Soil samples (77) were collected to determine SOC storage. These samples were interpolated using the QGIS Smart-Map plugin to obtain a spatial COS predictive model. Thematic maps were generated for each factor. Areal statistics, Pearson’s correlation and principal component analysis (PCA) were performed to explain COS variability. The results in the variability of SOC with respect to vegetation cover and land use, showed adult pine plantations with the highest value of SOC with 36.8 t.ha-1, followed by seasonal agriculture with 28.8 t.ha-1. The most effective management practice for storing COS was the stone terrace with 35.0 t.ha-1. Our results indicate that vegetation cover and land use complemented by soil and water conservation practices are the main drivers of SOC storage in small watersheds.

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墨西哥小流域土壤有机碳空间变化的相关因素

了解土壤有机碳（SOC）的存量并阐明影响其在小流域内空间分布的变量，对于推进有针对性的气候变化减缓战略（特别是针对水土保持的战略）至关重要。之所以选择该流域，是因为该流域在长达三十年的时间里实施了多种水土保持措施。因此，本研究的目的是分析土地利用、植被覆盖、坡度和水土保持措施（SCWP）对瓦哈卡州 Mixteca Alta 地区一个小流域土壤有机碳的变化和空间分布的影响因素。墨西哥。收集了土壤样本（77 份）以确定 SOC 的储存量。使用 QGIS 智能地图插件对这些样本进行插值，以获得空间 COS 预测模型。为每个因子生成了专题地图。进行了区域统计、皮尔逊相关性和主成分分析（PCA），以解释 COS 变异性。SOC 随植被覆盖和土地利用而变化的结果显示，成松种植园的 SOC 值最高，为 36.8 吨/公顷，其次是季节性农业，为 28.8 吨/公顷。储存 COS 的最有效管理方法是石梯田，为 35.0 吨/公顷。我们的研究结果表明，植被覆盖和土地利用以及水土保持措施是小流域储存 SOC 的主要驱动力。

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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Revista de la Facultad de Agronomía, Universidad del Zulia

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