Effects of loaded ammonium nitrogen on the cadmium passivation efficiency of biochar in soils
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.
biocharammonium nitrogencadmiumsoilmicrobial community structure
万方数据
维普
