用于检测热带土壤中生物炭碳迁移的三种量化方法的比较:赞比亚4.5年的田间试验

IF 5.6 1区 农林科学 Q1 SOIL SCIENCE
Jing Lyu , Alfred Obia , Gerard Cornelissen , Jan Mulder , Andreas Botnen Smebye , Andrew R. Zimmerman
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引用次数: 0

摘要

了解生物炭在土壤中的稳定性和运动对其在土壤改良和固碳工程中的有效利用至关重要。先前的一项研究利用δ13C同位素评估了玉米生物炭碳(BC)在赞比亚壤土中4.5年后的三种大小组分的迁移,该研究在此基础上,将结果与使用化学热氧化(CTO)和苯多羧酸(BPCA)生物标志物的结果进行了比较。δ13C法在表层(0 ~ 7 cm)测得的BC最多,而在下层(7 ~ 30 cm)测得的BC较少,向下迁移3.2% ~ 7.9%,且差异较大。BPCA方法在较低的层中检测到相对较多的BC(向下迁移的9.1 - 20.2%),特别是对于细粒度的生物炭。它在对照土壤地块和实验地块外检测到最多的BC,这表明它在精细生物炭检测方面的效率很高,或者存在假阳性检测的问题。CTO方法虽然在检测细颗粒生物炭BC时灵敏度较低,但与δ13C同位素结果密切相关,因此代表了一种成本效益高且更简单的BC定量方法。这些发现强调了在生物炭C定量中考虑方法学的必要性,以确保准确评估其分布和稳定性。这是正确分配气候缓解信用额度的迫切需要。需要开展更多涉及多种生物炭类型和量化方法的实地研究,以完善我们对土壤中生物炭C动态的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparison of three quantification methods used to detect biochar carbon migration in a tropical soil: A 4.5-year field experiment in Zambia
Understanding the stability and movement of biochar in soil is pivotal for its effective use in soil improvement and carbon sequestration projects. Building on a previous study that evaluated the migration of three size fractions of maize biochar carbon (BC) after 4.5 years in a Zambian loamy sand soil using δ13C isotopes, this study compares the results with those using chemothermal oxidation (CTO) and benzene polycarboxylic acid (BPCA) biomarkers. While the δ13C method registered the most BC in the application layer (0–7 cm), it detected less BC in lower layers (7–30 cm, 3.2–7.9 % downward migration), and with a greater variance, than the other two methods. The BPCA method detected relatively more BC in the lower layers (9.1–20.2 % downward migration), particularly for fine-sized biochar. It also detected the most BC in the control soil plot and outside the experimental block, which suggests either its efficiency in fine biochar detection or an issue with false positive detection. The CTO method, though less sensitive in detecting fine biochar particle BC, was strongly correlated with δ13C isotope results, thus representing a cost-effective and simpler alternative to the other BC quantification methods. These findings underscore the necessity of methodological consideration in biochar C quantification to ensure accurate assessment of its distribution and stability. This is a pressing need for correct assignment of climate mitigation credits. More field studies should be carried out involving multiple biochar types and quantification methods to refine our understanding of biochar C dynamics in soil.
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来源期刊
Geoderma
Geoderma 农林科学-土壤科学
CiteScore
11.80
自引率
6.60%
发文量
597
审稿时长
58 days
期刊介绍: Geoderma - the global journal of soil science - welcomes authors, readers and soil research from all parts of the world, encourages worldwide soil studies, and embraces all aspects of soil science and its associated pedagogy. The journal particularly welcomes interdisciplinary work focusing on dynamic soil processes and functions across space and time.
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