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目前国内外利用土壤微生物检测重金属毒性的例子不多。我们就土壤微生物的一个生理小种——固氮菌作为指标,以固氮菌开始达到抗性时的重金属浓度,表示毒性临界浓度,研究了全国六个地带性土壤和三个紫色土,共计九种典型土壤,测定了五种重金属和砷对固氮菌的毒性,提出了四十八个毒性临界浓度。期望为我国“土壤环境容量”的研究提供参数和客观依据。同时还对重金属镉和铜的作用下固氮菌的作用机制作了初
At present, there are not many examples of using soil microbes to detect the toxicity of heavy metals at home and abroad. We are a physiological races of soil microorganisms - Azotobacter as an indicator to begin Azotobacter resistant to heavy metal concentrations, indicating the critical concentration of toxicity, the study of the country’s six zonal soil and three purple soil, a total of nine species Typical soils, the toxicity of five heavy metals and arsenic to azotobacter was determined, and 48 critical toxicities were proposed. Expect to provide the parameters and objective basis for the study of “soil environmental capacity” in our country. At the same time also on the role of heavy metal cadmium and copper under the action of nitrogen-fixing bacteria made the beginning