稀土配合物农用对土壤微生物活性的影响

研究了稀土(La,Nd)与唑类二元和三元配合物及其稀土盐对耕作土壤中细菌、霉菌及土壤酶活性的影响作用;结果表明,各供试稀土盐配合物在浓度小于1.5 mg/g时对土壤生物活性影响不大。当浓度大于3mg/g时,对土壤中细菌、霉菌及脱氢酶、过氧化氢酶活性均具有一定抑制作用。在化合物浓度为15mg/g土样中:细菌生长的抑制率达47％-63％,霉菌为23％-34％,过氧化氢酶抑制率为9.5％-38.7％,脱氢酶活性明显降低。稀土化合物农用对土壤微生态环境的影响不容忽视。

Effect of Coordination Complexes of Rare Earth Applied to Agriculture on Soil-microenvironment

The effects of coordination complexes of the rare earth (La Nd) chlorides with imidazole and simple chloride salt on bacteria, mold and enzyme activity in field soil are determined in the laboratory. The result of the determination shows that the coordination complexes of rare earth used on experiment, when their concentration is less than 1. 5 mg/g, have little effect on biological activity of the field soil; When their concentration is more than 3 mg/g. they have inhibitory effect on bacteria, mold, catalase and dehydrogenase in soil. In the coordination complexes of the sample soil, whose concentration is 15mg/g, inhibitory effect on bacteria is 47%-63%, on mold is 23%-34%, and on soil-catalase is 9. 5%-38. 7%, dehydrogenase activity obviously decreases; Therefore attention should be paid to the effect of rare earth used in agriculture soil microenvironment.