负载铵态氮对生物炭钝化土壤中镉性能的影响

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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

Received: 14 July 2023

PACS:

X53

Corresponding Authors: 史广宇,副教授,shigy@usts.edu.cn E-mail: shigy@usts.edu.cn

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	HU Jia-yuan
	WANG Qian
	WU Bei-bei
	SHI Wei-lin
	SHI Guang-yu

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HU Jia-yuan,WANG Qian,WU Bei-bei等. Effects of loaded ammonium nitrogen on the cadmium passivation efficiency of biochar in soils[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(3): 1418-1425.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I3/1418

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