【摘要】 在黄褐土中模拟长期使用稀土微肥产生的Ce积累以研究稀土对土壤微生物的生态效应 .不同类群微生物对Ce的敏感性依序为细菌 >放线菌 >真菌 .1 0 %吸附容量以上的Ce对细菌总数都产生抑制作用 .1 0 %吸附容量以下的Ce对放线菌总数产生刺激作用 .5～ 50 %吸附容量的Ce对真菌总数产生刺激作用 .5%吸附容量以上的Ce对好气性纤维素分解细菌和氨化细菌都产生抑制作用 .5～ 1 0 %吸附容量和 5～ 50 %吸附容量的Ce分别对分解纤维素真菌、分解蛋白质的真菌产生刺激作用 .在高积累Ce的胁迫下放线菌、真菌、分解纤维素真菌和氨化微生物的种群结构发生了不同程度的改变 .更多还原

【Abstract】 Different accumulations of Ce due to a longterm application of rare earth elements were simulated in yellow cinnamon soil to study the ecological effect of rare earth on soil microflora. The sensitivity of different groups of soil microbes to Ce is decreased in the order of bacteria>actinomycetes>fungi. The amount of bacteria is inhibited when the concentration of Ce is larger than 10% of adsorption capacity (AD), and the growth of actinomycetes was stimulated at its concentration of <10% AD. Ce concentration ranged in 5～50% AD had a strong stimulation on the amount of soil fungi, and that of >5% AD inhibited aerobic cellulolytic bacteria and ammonifying bacteria. Ce accumulations of 5～10% AD and 5～50% AD stimulated the amounts of cellulolytic and proteolytic fungi, respectively. Under the stress of high accumulation of Ce, the population structures of actinomycetes, fungi, cellulolytic fungi and ammonifying microbes were changed in different degrees.更多还原