Soil carbon stock potential in pastoral and silvopastoral systems in the Peruvian Amazon

IF 2 3区农林科学 Q2 AGRONOMY

Agroforestry Systems Pub Date : 2024-03-20 DOI:10.1007/s10457-024-00969-w

Rosario Salazar, Julio Alegre, Dante Pizarro, Alison J. Duff, Carlos García, Carlos Gómez

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Abstract

Research evaluating the impact of silvopastoral systems on physical and biological properties of Amazonian soils is scarce. Thus, this study aimed to compare the soil carbon storage potential and physical and chemical soil properties of silvopastoral systems (SPS) and conventional pastoral systems (CPS) in the San Martin region of Peru. Using the Walkley and Black method, we analyzed soil organic matter at two different depths (0–15 cm and 15–30 cm). In addition, bulk density, soil moisture, total porosity, and mechanical resistance were measured in both systems. The highest (P < 0.05) carbon stocks were reported at 0–15 cm of depth with values of 31.4 Mg ha⁻¹ and 34.4 Mg ha⁻¹ for CPS and SPS, respectively. At 15–30 cm depth, the total carbon stock was higher for SPS, with 29.12 Mg ha⁻¹, than for CPS, which had 26.4 Mg ha⁻¹. Despite the absence of statistically significant differences, soil carbon stocks were higher in SPS. No significant differences in soil moisture were found between systems, although soil moisture was slightly greater in SPS than CPS (28 and 25%, respectively). The CPS had 59% of the total porosity, which was higher than the SPS. Mechanical resistance was lower in SPS (2.15 kg/cm²) than in CPS (2.33 kg/cm²) at 10 cm of depth. These results indicated that the SPS has the potential to store more carbon and improve physical and chemical traits in the soil than the CPS.

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秘鲁亚马逊地区畜牧和林牧系统的土壤碳储量潜力

评估造林放牧系统对亚马逊土壤物理和生物特性影响的研究很少。因此，本研究旨在比较秘鲁圣马丁地区林牧系统（SPS）和传统牧业系统（CPS）的土壤碳储存潜力以及土壤的物理和化学特性。我们使用 Walkley 和 Black 方法分析了两个不同深度（0-15 厘米和 15-30 厘米）的土壤有机质。此外，我们还测量了两个系统的容重、土壤湿度、总孔隙度和机械阻力。据报告，0-15 厘米深度的碳储量最高（P < 0.05），CPS 和 SPS 分别为 31.4 兆克/公顷和 34.4 兆克/公顷。在 15-30 厘米深度，SPS 的总碳储量为 29.12 兆克/公顷-1，高于 CPS 的 26.4 兆克/公顷-1。尽管没有统计学上的显著差异，但 SPS 的土壤碳储量更高。不同系统之间的土壤湿度没有明显差异，但小麦秸秆还田系统的土壤湿度略高于大麦秸秆还田系统（分别为 28% 和 25%）。CPS 的孔隙度占总孔隙度的 59%，高于 SPS。在 10 厘米深处，SPS 的机械阻力（2.15 千克/平方厘米）低于 CPS（2.33 千克/平方厘米）。这些结果表明，与 CPS 相比，SPS 有潜力储存更多的碳并改善土壤的物理和化学性质。

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来源期刊

Agroforestry Systems 农林科学-林学

CiteScore

5.30

自引率

9.10%

发文量

审稿时长

4.5 months

期刊介绍： Agroforestry Systems is an international scientific journal that publishes results of novel, high impact original research, critical reviews and short communications on any aspect of agroforestry. The journal particularly encourages contributions that demonstrate the role of agroforestry in providing commodity as well non-commodity benefits such as ecosystem services. Papers dealing with both biophysical and socioeconomic aspects are welcome. These include results of investigations of a fundamental or applied nature dealing with integrated systems involving trees and crops and/or livestock. Manuscripts that are purely descriptive in nature or confirmatory in nature of well-established findings, and with limited international scope are discouraged. To be acceptable for publication, the information presented must be relevant to a context wider than the specific location where the study was undertaken, and provide new insight or make a significant contribution to the agroforestry knowledge base