Pot experiment was conducted to remediate heavy metal contaminated soil with different amounts of HNO3 modified lychee biochar(0.125%,0.250%,0.500% and 1.000%,w/w),and the effects of HNO3 modified lychee biochar on the accumulation and distribution of Cu,Ca,As and Cd in soybean plants were studied.Results showed as follows:(1)Low addition amount of HNO3 modified lychee biochar inhibited the growth of soybean plants,while high addition amount of HNO3 modified lychee biochar promoted the growth of soybean plants.(2)HNO3 modified lychee biochar in...