评估计算法是否是监测土壤无机碳储量的可靠方法

IF 2.3 Q1 AGRICULTURE, MULTIDISCIPLINARY ACS agricultural science & technology Pub Date : 2024-07-30 DOI:10.1021/acsagscitech.4c0008810.1021/acsagscitech.4c00088
Joyce M. P. Silva, Mauricio R. D. Bomio, Fabiana V. Motta and Rafael M. Santos*, 
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引用次数: 0

摘要

可靠地测量土壤中的无机碳含量及其因土地管理方法和改良措施而产生的变化,对于作为监测、报告和验证计划一部分的碳储量的精确量化至关重要。虽然有多种方法可用于评估土壤中的碳酸盐含量,但最直接的方法是煅烧法,它涉及固相碳酸盐的溶解和气相二氧化碳通过酸引发反应的演化。尽管钙钛矿法是一种成熟的方法,但它在测量土壤无机碳(SIC)微小变化方面的可靠性如何,以及潜在的干扰反应、样本大小和固液接触对其测量的影响如何,这些都是不确定因素,因此需要对这些影响进行专门的研究。本研究通过参数分析,研究了固液比、未风化硅酸盐相的存在以及大量有机物的存在等因素的影响,从而证明了钙钛矿测定法的可靠性及其局限性。研究结果表明,钙钛矿测定法在各种土壤条件下都有可靠的表现,这些土壤条件预计会在加强岩石风化和其他最佳管理实践活动中遇到,这些活动旨在提高全球土壤碳储量,以此作为减缓气候变化的策略。
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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Assessment of Calcimetry as a Reliable Method for Monitoring Soil Inorganic Carbon Stocks

The reliable measurement of the inorganic carbon content of soils and its changes resulting from land management practices and amendments is crucial for precisely quantifying carbon stocks as part of monitoring, reporting, and verification schemes. While various methods are available for evaluating the carbonate content in soils, the most direct approach is calcimetry, which involves the dissolution of solid-phase carbonates and the evolution of gas-phase CO2 through acid-initiated reactions. Despite being a well-established method, uncertainties about how reliable calcimetry is to measure small changes in soil inorganic carbon (SIC) or how its measurement may be affected by potentially interfering reactions, sample size, and solid–liquid contact call for a dedicated investigation of these effects. The present study demonstrates the reliability of the calcimetry method and its limits through a parametric analysis that investigated the effect of the solid-to-liquid ratio, the presence of unweathered silicate phases, and the presence of copious amounts of organic matter. The results point to the reliable performance of calcimetry within the range of soil conditions that can be expected to be encountered during activities involving enhanced rock weathering and other best management practices that aim to boost the global soil carbon stocks as a climate change mitigation strategy.

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