新疆平原荒漠草甸盐土微生物学特性研究

Study on Microbiololgical Characteristic in Plain Desert Meadow Solonchalk of Xinjiang

本文报道广对新疆平原荒漠草甸盐土微生物学特性的研究．结果表明：新疆平原荒漠草甸盐土中分布的微生物数以细菌占绝对优势，占总菌数的９９．８％．０＝～４０ｃｍ土层是该类土壤微生物数量分布及生物学活性最大的区域．土壤微生物呈现明显的季节性变化规律．氮素生理群微生物氨化细菌最多，芽孢细菌次之，硝化细菌极少，好气固氮菌未测定到．平原荒漠草甸盐土中各类微生物的数量及分布密度均低于同地区的耕地土壤．

The paper deals with the microbiological characteristic in plain desert meadow solonchalk of Xinjiang. The results show that the number of bacterias constitutes the majority and counts for 99.8% or the total number of microbes in the soil. Soil microbes arc mainly concentrated in upper layer(0-40 cm). Their amount decreases with increasing soil depth.Thc seasonal characteristics of the soil microbes have clear vegularity.The number of various microbial physiological groups in the soil is different. The number is decreased in order of: ammoniaers> bacillus sp.>Nitrobacteria. No azotobacter can be found in the soil.