摘要
菱镁矿在开采和冶炼过程中释放出的大量粉尘(主要成分为MgCO3和MgO)严重污染了矿区内的土壤。通过分析辽宁海城某一矿区内距冶炼厂不同距离的废弃地土壤理化性质与微生物生物量及活性,发现距冶炼厂越近,土壤水溶性Mg2+含量、pH以及微生物代谢熵越高,而有机C、全量N、全量P、矿质N、速效P、微生物生物量C和N及N矿化速率越低。同时水溶性Mg2+含量与全量N、矿质N、速效P、水溶性Ca2+、土壤微生物生物量C和N、土壤N矿化速率呈显著负相关,表明高浓度Mg2+的存在,影响了土壤的理化性质及微生物特性,降低了土壤质量。
Soils around magnesite mine region are severely contaminated by dusts from mining and smelting activities.The dusts contained high content of magnesium carbonate and magnesium oxide.Soil pH,soil organic C,total N,total P,mineral N,available P,soluble Ca2＋,soluble Mg2＋ concentrations,soil potential mineralization rates,soil microbial biomass C and N,and soil metabolic quotient（qCO2） were compared among different sites from different distances around the smelting factory of a magnesite mine in Haicheng City,Liaoning Province.Soil pH,soluble Mg2＋ concentration and qCO2 were higher at the sites nearer the smelting factory,while soil organic C,total N,total P,available P and mineral N concentration,soil microbial biomass C and N,and soil potential N mineralization rate were lower.Soluble Mg2＋ had significantly negative correlations with total N,mineral N,available P,soluble Ca2＋,soil microbial biomass C and N,and potential N mineralization rate.The results indicated that high content of magnesium influenced soil physico-chemical properties,soil microbes and their activities,and thus decreased soil quality.
出处
《土壤通报》
CAS
CSCD
北大核心
2010年第5期1216-1221,共6页
Chinese Journal of Soil Science
基金
中国科学院知识创新工程项目(KZCX2-YW-405-01)资助
关键词
菱镁矿
粉尘
污染
废弃地
土壤性质
Magnesite
Dusts
Contamination
Abandoned land
Soil properties
