Effect of Cu contamination on microorganisms in rhizosphere of RumexK-1

Effects of Cu contamination on microorganisms in rhizosphere of RumexK-1 were studied. The results showed that the numbers of fungi, phosphate-solubilizing bacteria and potassium-solubilizing bacteria all increased at low copper concentration but decreased at high concentration. The numbers of bacteria, actinomycetes and ammonibacteria of those copper additions were all lower than that of control. Soil respiration increased under copper treatment except at 300 mg kg^-1 copper concentration, and the highest soil respiration was observed at 100 mg kg^-1 treatment, about 38.38 mg (g d)^-1. Soil microbial biomass nitrogen (N_mic) of copper treatment was lower than control except 50 mg kg^-1 treatment. The highest N_mic was observed at 50 mg kg^-1 treatment, about two times of CK, while the lowest was at 300 mg kg^-1, only 1/6 of CK.