摘要
重金属累积效应是目前重金属污染土壤的主要形式,研究重金属多次污染对土壤微生物活性的影响是急需解决的科学问题。研究了外源镉的累积效应对土壤FDA水解酶活性和微生物能量代谢活性的影响。结果表明,在镉总量相同时,随着镉加入次数的增多,低浓度(2.0mg·kg-1)镉对FDA水解酶活性的促进作用变大,高浓度(20.0mg·kg-1、40.0mg·kg-1)镉的抑制作用变小,微生物生长速率常数k变大;镉以少量多次的方式加入土壤,微生物受到反复刺激后生长速率变快,FDA水解酶活性升高。
Nowadays, the cumulative effect of heavy metals on soil is the main form of heavy metal pollu- tion. The impact of repeated heavy metal pollution on soil microbial activity is a scientific problem needed to be solved urgently. The influences of Cd cumulative effect on soil FDA hydrolase activity and microbial energy me- tabolism activity were studied. Results showed that with the increase of adding times, the low concentration （2.0 mg·kg^-1） of Cd activation on FDA hydrolase increased and the high concentration（20.0 mg ·kg^-1 and 40.0 mg ·kg^-1 ） of Cd inhibition decreased and the microbial growth rate constant （k） increased. The microbial growth rate accelerated and the FDA hydrolase activity increased under repeated stimulation when Cd was added into the soil more than once.
出处
《化学与生物工程》
CAS
2016年第7期23-27,共5页
Chemistry & Bioengineering
基金
国家自然科学基金重点项目(4143000452)
环保部环保公益项目(201409042)
关键词
镉
累积效应
土壤微生物
FDA水解酶
能量代谢
Cd
cumulative effect
soil microbacterium
FDA hydrolase
energy metabolism
