重金属Cu与Pb复合污染对土壤呼吸影响的研究

目的]比较重金属Cu与Pb复合污染与单一污染对土壤呼吸强度的影响。方法]采用室内碱液吸收法研究了Cu与Pb及其复合污染对土壤呼吸强度的影响及其随时间的动态变化。结果]重金属Cu和Pb单一污染及其复合污染对土壤呼吸强度的影响,随重金属浓度及培养时间而变化。复合污染与单一污染处理比较表明,Cu和Pb同时存在时,对土壤呼吸强度的影响随时间的变化先增大后减小;对土壤呼吸强度的影响依次表现为Cu与Pb复合污染>Pb>Cu,表明Cu和Pb有一定的协同作用;复合污染的初期CO2释放量高于Pb和Cu单一污染,对土壤呼吸有一定的促进作用。结论]该试验结果为研究重金属污染对土壤微生物的影响及评价土壤环境质量提供科学依据。

Study on the Influences of Combined Pollution of Heavy Metals Cu and Pb on Soil Respiration

Objective] The purpose was to compare the influences of combined pollution of heavy metals Cu and Pb and their single pollutions on soil respiration intensity.Method] In the lab,the alkali absorption was used to study the influences of Cu or Pb and their combined pollution on soil respiration intensity and the dynamic change along with time.Result] The influences of single and combined pollutions of heavy metals Cu and Pb on soil respiration intensity varied with heavy metal concentration and culture time.The comparison between combined and single pollution treatments showed that when Cu and Pb coexisted,their influences on soil respiration intensity first increased and then decreased along with time.The influence on soil respiration intensity in order was the combined pollution of Cu and Pb > Pb > Cu,which showed that Cu and Pb had some synergetic effects.The CO2 release amount of combined pollution was higher than that of single pollutions of Pb and Cu in the initial stage,which had some promoting effects on soil respiration.Conclusion] The experimental results supplied scientific basis for studying the influence of heavy metal pollution on soil microorganism and evaluating soil environmental quality.