负载铵态氮对生物炭钝化土壤中镉性能的影响

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摘要设置室内土壤试验和模拟吸附试验,以探究负载铵态氮对生物炭钝化镉能力的影响,并研究负载铵态氮影响生物炭钝化土壤中镉能力的机理.结果表明,相较于仅施加生物炭和生物炭/氯化铵混施的土壤,施加负载铵态氮的生物炭可以显著降低土壤中二乙三胺五乙酸提取态镉的含量约19.20%和23.34%(P<0.05).模拟吸附实验结果指出,负载铵态氮使生物炭对低浓度镉(0.10mg/L)的吸附能力显著提高约11.70%(P<0.05),这是由于负载铵态氮可以减弱生物炭的疏水性并显著提高其比表面积和微孔总体积约14.82%和25.00%(P<0.05).施加负载铵态氮的生物炭可以改善土壤微生物生境、驱动微生物群落结构改变并刺激Paenibacillus属和Bradyrhizobium属等功能微生物富集,这亦是负载铵态氮提高生物炭钝化土壤中镉能力的重要原因.负载铵态氮可以提高生物炭钝化土壤中镉的能力,负载铵态氮的生物炭是一种极具潜力的土壤调理剂.

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	胡嘉源
	王倩
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	施维林
	史广宇

关键词 ：生物炭, 铵态氮, 镉, 土壤, 微生物群落结构

Abstract：The laboratory experiment and simulated adsorption experiment were conducted to explore the effects of loading ammonium nitrogen on the passivation ability of biochar for cadmium, and to explore the mechanism of loading ammonium nitrogen on the ability of biochar to passivate cadmium in soils. Results indicated that compared with the soil with only biochar and biochar/ammonium chloride mixed application, the application of biochar loaded with ammonium nitrogen could significantly reduce the content of the effective state of cadmium in the soil by 19.20% and 23.34% (P<0.05). The results of the simulated adsorption experiments indicated that the loading of ammonium nitrogen significantly increased the adsorption capacity of biochar to low concentration cadmium (0.10mg/L) by 11.70% (P<0.05), because the loading of ammonium nitrogen could weaken the hydrophobicity and significantly increased its specific surface area and total volume of micropores by 14.82% and 25.00% (P<0.05). Applying biochar loaded with ammonium nitrogen can improve the soil microbial habitat, change the soil microbial community structure, and stimulate the enrichment of functional microorganisms such as Paenibacillus and Bradyrhizobium, which are also the important reasons for loading ammonium nitrogen to improve the ability of biochar to passivate cadmium in soils. Loading ammonium nitrogen can improve the ability of biochar to passivate cadmium in soil, and biochar loaded with ammonium nitrogen is a potential soil conditioner.

Key words： biochar ammonium nitrogen cadmium soil microbial community structure

收稿日期: 2023-07-14

PACS:

X53

基金资助:国家自然科学基金资助项目(41807142);苏州市科技局科技计划项目(SNG2020053);苏州市科技局科技计划项目(SNG2022072);江苏省研究生科研与实践创新计划项目(SJCX21_1415)

作者简介: 胡嘉源(1998-),男,安徽蚌埠人,苏州科技大学硕士研究生,主要从事重金属污染土壤修复的研究.2827706352@qq.com.

引用本文:

胡嘉源, 王倩, 吴贝贝, 施维林, 史广宇. 负载铵态氮对生物炭钝化土壤中镉性能的影响[J]. 中国环境科学, 2024, 44(3): 1418-1425. HU Jia-yuan, WANG Qian, WU Bei-bei, SHI Wei-lin, SHI Guang-yu. Effects of loaded ammonium nitrogen on the cadmium passivation efficiency of biochar in soils. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(3): 1418-1425.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I3/1418

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