摘要
室内培养试验表明 ,La对红壤微生物碳氮及呼吸强度均表现为抑制作用 ,并随浓度增加 ,抑制作用增强 ,在 10 0mg·kg- 1 时达到显著水平 ;随着培养时间的延长 ,La对微生物碳氮和呼吸强度的抑制作用有减少的趋势 ,但短期内抑制作用难以消除。水稻盆栽试验表明 ,在低浓度时 ,La对土壤微生物碳氮和呼吸强度有少量刺激作用 ,但随着浓度的增加 ,则产生抑制作用并不断增强 ,在 3 0 0mg·kg- 1 时达到显著水平。
The results in soil culture experiment show that La has inhibitory effects on the microbial biomass C, N and respiration in red soil. The inhibition is strengthened with increasing concentration and the critical concentration of La is about 100 mg·kg -1 . The results in rice pot culture experiment show that La has slight stimulative effects on the microbial biomass C, N and respiration in red soil at low concentration while has inhibitory effects at high concentration. The inhibition is strengthened with increasing concentration and the critical concentration of La is about 300 mg·kg -1 . Soil microbial biomass and respiration are two important indicators on evaluating rare earths polluted soils.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2001年第2期158-161,共4页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金! (2 9890 2 82 )资助项目
