Characteristics and phytotoxicity of hydrochar-derived dissolved organic matter: Effects of feedstock type and hydrothermal temperature

文献类型： 外文期刊

第一作者： Lang, Qianqian

作者： Lang, Qianqian;Guo, Xuan;Wang, Chao;Li, Lingyao;Li, Yufei;Xu, Junxiang;Zhao, Xiang;Li, Jijin;Liu, Bensheng;Sun, Qinping;Zou, Guoyuan

作者机构：

关键词： Hydrochar; Hydrothermal temperature; Dissolved organic matter; Excitation emission matrix; Parallel factor analysis; Phytotoxicity

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：6.9； 五年影响因子：6.2 ）

ISSN： 1001-0742

年卷期： 2025 年 149 卷

页码：

收录情况： SCI

摘要： The dissolved organic matter (DOM) with high mobility and reactivity plays a crucial role in soil. In this study, the characteristics and phytotoxicity of DOM released from the hydrochars prepared from different feedstocks (cow manure, corn stalk and Myriophyllum aquaticum ) under three hydrothermal carbonization (HTC) temperatures (180, 200 and 220 degrees C) were evaluated. The results showed that the hydrochars had high dissolved organic carbon content (20.15 to 37.65 mg/g) and its content showed a gradual reduction as HTC temperature increased. Three fluorescent components including mixed substance of fulvic acid-like and humic acid-like substances (C1, 30.92%-58.32%), UVA humic acid-like substance (C2, 25.27%29.94%) and protein-like substance (C3, 11.74%-41.92%) were identified in hydrochar DOM by excitation emission matrix spectra coupled with parallel factor analysis. High HTC temperature increased the relative proportion of aromatic substances (C1 + C2) and humification degree of hydrochar DOM from cow manure, while it presented adverse effects on the hydrochar DOM from corn stalk and Myriophyllum . aquaticum . The principal component analysis suggested that feedstock type and HTC temperature posed significant effects on the characteristics of hydrochar DOM. Additionally, seed germination test of all hydrochar DOM demonstrated that the root length was reduced by 8.88%-26.43% in contrast with control, and the germination index values were 73.57%-91.12%. These findings provided new insights into the potential environmental effects for hydrochar application in soil. (c) 2024 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

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