Effects of manganese-modified biochar on accumulation of arsenic and lead in garlic and soil enzyme activity
[Objective]Soil heavy metal pollution is a common problem encountered in agricultural production activities,and how to effectively and synchronously passivate arsenic and lead in soil has become a research hotspot.[Method]Raw biochar was prepared from rice husks,and manganese-modified biochar was obtained through potassium permanganate.Pot experiments were conducted using garlic(Allium sativum)as an indicator plant to evaluate the effects of raw biochar and manganese-modified biochar at different application rates(10 and 30 g·kg-1)on the bioavailability of arsenic and lead in soil and soil enzyme activities.[Result]The application of different proportions and types of biochar significantly increased the content and pH of soil organic matter,available potassium and available phosphorus(P＜0.05),while decreased the content of soil alkaline hydrolyzed nitrogen.The effect of manganese-modified biochar was more significant than that of original biochar.The application of 10 g·kg-1manganese-modified biochar significantly reduced the content of available arsenic in soil by 11.5％,while 30 g·kg-1 manganese-modified biochar significantly decreased the content of lead in the extractable state of diethylenetriamine pentaacetic acid(DTPA)in soil by 28.3％.Compared with the control,the application of 10 g·kg-1 manganese-modified biochar increased the activities ofβ-N-acetylglucosamine glycase by 11.6％,and the application of 30 g·kg-1 manganese-modified biochar significantly increased the activity of acid phosphatase and β-glucoglycase by 9.8％and 37.7％,respectively.Meanwhile,the contents of nitrogen,phosphorus and potassium in garlic plants treated with manganese-modified biochar significantly increased(P＜0.05),while the contents of arsenic and lead significantly decreased(P＜0.05).[Conclusion]Manganese-modified biochar has significant potential in improving soil fertility and repairing arsenic-lead contaminated soil.[Ch,8 fig.1 tab.52 ref.]
heavy metalbiocharsoil remediationbioavailabilityenzyme activity
国家科技期刊平台
NSTL
万方数据
