College of Tropical Crops, Hainan University, Haikou 570228, China.
College of Tropical Crops, Hainan University, Haikou 570228, China.
J Environ Sci (China). 2022 Nov;121:77-89. doi: 10.1016/j.jes.2021.09.018. Epub 2022 Feb 1.
This work was to study composition characteristics and the subsequent effect on the lead (Pb) binding properties of dissolved organic matter (DOM) derived from seaweed-based (SWOF) and chicken manure organic fertilizers (CMOF) during a one-year field incubation experiment using the excitation-emission matrix-parallel factor (EEM-PARAFAC) and two-dimensional correlation spectroscopy (2DCOS) analysis. Results showed that high aromatic and hydrophobic fluorescent substances were enriched in CMOF-derived DOM and SWOF-derived DOM and enhanced over time. And phenolic groups in the fulvic-like substances for SWOF-derived DOM and carboxyl groups in the humic-like substances for CMOF-derived DOM had the fastest responses over time, respectively. Moreover, both non-fluorescent polysaccharides and fluorescent humic-like substances or fulvic-like substances with aromatic (C=C) groups first participated in the binding process of Pb to SWOF-derived DOM on day 0 and 180 during the lead binding process. In contrast, humic-like substances associated with aromatic (C=C) and phenolic groups gave a faster response to Pb binding on day 360. Regarding CMOF-derived DOM, the fulvic-like substances associated with aromatic (C=C) and carboxylic groups displayed a faster response to Pb ions on day 0. Nonetheless, polysaccharides and humic-like associated with phenolic groups had a faster response on days 180 and 360. It is noteworthy that the polysaccharides, which participated in Pb binding to CMOF-derived DOM, posed a higher risk of Pb in the environment after 360 days. Therefore, these findings gave new insights into the long-term applications of commercial organic fertilizers for the amendment of soil.
本研究通过使用激发-发射矩阵平行因子（EEM-PARAFAC）和二维相关光谱（2DCOS）分析，在为期一年的田间培养实验中，研究了海藻基（SWOF）和鸡粪有机肥（CMOF）衍生的溶解性有机质（DOM）的组成特征及其对铅（Pb）结合特性的后续影响。结果表明，CMOF 衍生 DOM 和 SWOF 衍生 DOM 中富含高芳香性和疏水性荧光物质，且随时间推移而不断富集。并且，SWOF 衍生 DOM 中富里酸类物质中的酚类基团和 CMOF 衍生 DOM 中腐殖酸类物质中的羧基基团的响应速度最快。此外，非荧光多糖以及具有芳香性（C=C）基团的荧光腐殖酸类物质或富里酸类物质首先参与了 Pb 与 SWOF 衍生 DOM 的结合过程，在 Pb 结合过程中，SWOF 衍生 DOM 在第 0 天和 180 天参与结合，而 CMOF 衍生 DOM 在第 360 天参与结合。对于 CMOF 衍生 DOM，具有芳香性（C=C）和羧基基团的富里酸类物质对 Pb 离子的结合反应更快。然而，具有芳香性（C=C）和酚类基团的富里酸类物质在第 0 天对 Pb 离子的结合反应更快。尽管如此，多糖和与酚类基团结合的腐殖酸类物质在第 180 天和第 360 天的反应更快。值得注意的是，在 360 天后，参与 CMOF 衍生 DOM 结合 Pb 的多糖，对环境中的 Pb 具有更高的风险。因此，这些发现为商业有机肥在土壤改良中的长期应用提供了新的见解。
