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

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

机构地区：[1]Institute of Plant Nutrition and Resources,Beijing Academy of Agriculture and Forestry Sciences,Beijing 100097,China

出　　处：《Journal of Environmental Sciences》2025年第3期139-148,共10页环境科学学报(英文版)

基　　金：supported by the Director Fund Project provided by the Institute of Plant Nutrition,Resources and Environment,Beijing Academy of Agriculture and Forestry Sciences(No.YZS202101);the Youth Fund Project provided by Beijing Academy of Agriculture and Forestry Sciences(No.QNJJ202125);China Agriculture Research System of MOF and MARA.

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 ofDOMreleased fromthe hydrochars prepared from different feedstocks(cowmanure,corn stalk and Myriophyllum aquaticum)under three hydrothermal carbonization(HTC)temperatures(180,200 and 220°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.

关 键 词：Hydrochar Hydrothermal temperature Dissolved organic matter Excitation emission matrix Parallel factor analysis PHYTOTOXICITY 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]