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中国农学通报 ›› 2023, Vol. 39 ›› Issue (12): 61-68.doi: 10.11924/j.issn.1000-6850.casb2022-0434

• 资源·环境·生态·土壤 • 上一篇    下一篇

不同方法提取的生物质炭可溶性有机物性质研究

郑小东(), 李翔, 魏岚, 黄连喜, 陈伟盛, 黄玉芬, 黄庆, 刘忠珍()   

  1. 广东省农业科学院农业资源与环境研究所,农业农村部南方植物营养与肥料重点实验室,广东省养分资源循环利用与耕地保育重点实验室,广州 510640
  • 收稿日期:2022-05-31 修回日期:2022-08-15 出版日期:2023-04-25 发布日期:2023-04-21
  • 通讯作者: 刘忠珍,女,1977年出生,河南新乡人,研究员,博士,研究方向:土壤污染物治理。通信地址:510640 广州天河区金颖路66号 广东省农业科学院农业资源与环境研究所,Tel:020-38085151,E-mail:lzzgz2001@163.com
  • 作者简介:

    郑小东,男,1987年出生,博士,研究方向:环境化学。通信地址:510640 广州天河区金颖路66号 广东省农业科学院农业资源与环境研究所,Tel:020-85161402,E-mail:

  • 基金资助:
    广东省农业科学院低碳农业与碳中和研究中心“基于农业废弃物还田利用对土壤碳转化及固碳效应研究”(XTXM202204); 国家自然科学基金项目“生物炭调控可溶性有机物微生物转化过程及机理”(42207316); 广东省农科院新兴团队项目“土壤质量与污染控制”(202120TD); 广东省科技计划项目“广东省稻田不同耕作模式碳足迹及固碳效应野外科学观测研究站”(2021B1212050020); 2022年省级涉农统筹整合转移支付资金“2022年江门市本级推广耕地质量提升技术-菜地化肥减施增效与有机肥替代技术试验示范”(江财农[2021]126号)

Biochar-derived Dissolved Organic Matter Extracted by Different Methods: Property Study

ZHENG Xiaodong(), LI Xiang, WEI Lan, HUANG Lianxi, CHEN Weisheng, HUANG Yufen, HUANG Qing, LIU Zhongzhen()   

  1. Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture and Rural Affairs;Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation;Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640
  • Received:2022-05-31 Revised:2022-08-15 Online:2023-04-25 Published:2023-04-21

摘要:

为了揭示不同提取方法对生物质炭来源可溶性有机物(DOM)性质的影响,以生物质炭为研究对象,采用多种提取剂、提取方式提取生物质炭DOM,分析其碳含量及化学组成特征。结果表明:低温生物质炭中碱提取物DOC含量较高(15.6~40.0 g/kg),而高温生物质炭中盐提取物较高(0.27~7.04 g/kg)。酸提取物DOM化学组成较为简单,表现为SUVA254SUVA280值较低,且玉米秆生物质炭中酸提取物亲水性DOM比例(44.6%~73.6%)显著高于水和碱提取物(11.0%~53.2%、0.30%~31.4%)。碱提取物DOM化学组成较复杂,其SUVA254SUVA280值较高,同时玉米秆生物质炭中碱提取物疏水性DOM比例(68.6%~99.7%)显著高于酸和盐提取物(26.4%~55.4%、0%~46.9%)。该研究揭示了提取剂在生物质炭DOM提取方法中的重要性,而提取方式对其性质影响不显著,可为生物质炭DOM提取方法的选择提供参考。

关键词: 生物质炭, 可溶性有机物, 提取方法, 化学组成, 土壤重金属污染修复

Abstract:

This study aims at investigating the impact of different extraction methods on the properties of dissolved organic matter (DOM) derived from biochar. Biochar was used as material, DOM was extracted with various extracting agents and extraction patterns, and the carbon content and chemical composition of the extracts were analyzed. The results showed that the DOC content of alkali extract in low-temperature biochar was relatively high (15.6-40.0 g/kg), so was the DOC content of salt extract in high-temperature biochar (0.27-7.04 g/kg). The chemical composition of DOM in the acid extract remained relatively simple, showing that SUVA254 and SUVA280 were low. A higher proportion of hydrophilic DOM was found in the acid extract from cornstalk-derived biochar (44.6%-73.6%) compared with that in the water and alkali extracts (11.0%-53.2% and 0.30%-31.4%), respectively (P<0.05). Correspondingly, the chemical composition of DOM in the alkali extract was relatively complex, showing that SUVA254 and SUVA280 were high. A higher proportion of hydrophobic DOM was found in the alkali extract from cornstalk-derived biochar (68.6%-99.7%) compared with that in the acid and salt extracts (26.4%-55.4% and 0%-46.9%), respectively (P<0.05). The study indicates that extracting agents have certain significance in biochar DOM extraction, while extraction patterns exhibit a minor effect on the properties of biochar DOM. It could provide reference for selecting biochar DOM extraction method.

Key words: biochar, dissolved organic matter, extraction method, chemical composition, soil heavy metal contamination remediation