Variations in fluorescence properties of humic acids from calcareous soils amended with different swine manures in a long-term soil experiment

IF 2.2 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Ibrahim Mohammed, Busayo Kudaolu, Yuki Audette, James G. Longstaffe
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Abstract

Molecular properties of soil humic acid (HA) can play an important role in the mechanisms regulating plant nutrient availability. This study explores how the structure of HA is altered by long-term treatment with different forms of swine manure and how these changes may influence nutrient availability. Liquid swine manure (LSM), solid swine manure (SSM), and swine manure compost (SMC) were applied to a calcareous soil over 17 years in a long-term soil fertility study. HA was extracted from site soil samples and analyzed using fluorescence spectroscopic techniques, including a Cu2+ quenching experiment, in order to assess differences in the structure and functionality of the soil organic matter (SOM) resulting from these different treatments. Emission spectra of the SSM-HA and SMC-HA are similar, while the LSM-HA is distinct. Procedures such as parallel factor analysis (PARAFAC) decomposition of emission–excitation matrices showed that structures in the SSM-HA and SMC-HA samples have lower complexity, whereas the structures of LSM-HA are of higher complexity. Interactions with Cu2+ at different pH levels indicate that the LSM-HA shows more dynamic conformational changes as well as stronger interactions and higher quenching efficiency compared to the other treatments. Conversely, SMC-HA demonstrates relatively stable binding constant (Ka) values across different pH levels. The binding constants and quenching efficiency of SSM-HA are significantly affected by changes in pH. This study shows distinct structural characteristics of HA formed under different manure management systems and provides valuable insights into how these variations may impact nutrient dynamics in soils.

Abstract Image

在一项长期土壤实验中,用不同猪粪改良过的石灰性土壤中腐殖酸的荧光特性的变化。
土壤腐植酸(HA)的分子特性可在植物养分供应的调节机制中发挥重要作用。本研究探讨了长期使用不同形式的猪粪会如何改变土壤腐殖酸的结构,以及这些变化会如何影响养分的供应。在一项长期土壤肥力研究中,液态猪粪(LSM)、固态猪粪(SSM)和猪粪堆肥(SMC)被施用到石灰性土壤中长达 17 年。从现场土壤样本中提取 HA,并使用荧光光谱技术(包括 Cu2+ 淬火实验)进行分析,以评估这些不同处理方法导致的土壤有机质(SOM)结构和功能的差异。SSM-HA 和 SMC-HA 的发射光谱相似,而 LSM-HA 则不同。发射-激发矩阵的平行因子分析(PARAFAC)分解等程序表明,SSM-HA 和 SMC-HA 样品的结构复杂度较低,而 LSM-HA 的结构复杂度较高。在不同 pH 值下与 Cu2+ 的相互作用表明,与其他处理相比,LSM-HA 显示出更多的动态构象变化以及更强的相互作用和更高的淬灭效率。相反,SMC-HA 在不同的 pH 值下表现出相对稳定的结合常数(Ka)值。SSM-HA 的结合常数和淬灭效率受到 pH 值变化的显著影响。这项研究显示了在不同肥料管理系统下形成的 HA 的不同结构特征,并就这些变化如何影响土壤中的养分动态提供了宝贵的见解。
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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来源期刊
Journal of environmental quality
Journal of environmental quality 环境科学-环境科学
CiteScore
4.90
自引率
8.30%
发文量
123
审稿时长
3 months
期刊介绍: Articles in JEQ cover various aspects of anthropogenic impacts on the environment, including agricultural, terrestrial, atmospheric, and aquatic systems, with emphasis on the understanding of underlying processes. To be acceptable for consideration in JEQ, a manuscript must make a significant contribution to the advancement of knowledge or toward a better understanding of existing concepts. The study should define principles of broad applicability, be related to problems over a sizable geographic area, or be of potential interest to a representative number of scientists. Emphasis is given to the understanding of underlying processes rather than to monitoring. Contributions are accepted from all disciplines for consideration by the editorial board. Manuscripts may be volunteered, invited, or coordinated as a special section or symposium.
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