青藏公路沿线土壤微生物数量变化及其影响因素研究

doi:10.7522/j.issn.1000-0240.2013.0054

摘要/Abstract

摘要：

以青藏公路沿线土壤为研究对象, 研究了土壤可培养微生物数量的变化特征及影响因子. 结果表明: 青藏公路沿线土壤可培养微生物数量为0.77×10⁶~2.44×10⁷CFU·g^-1dw; 沿青藏公路从南(申格里贡山)到北(西大滩), 土壤可培养细菌与真菌数量表现为先迅速减少, 然后渐趋平缓; 可培养放线菌数量先减少后增加; 土壤总氮、有机碳和含水量逐渐降低, 而pH值逐渐升高. C/N比率与真菌/细菌比率变化趋势相似, 均为先增加后减少. 土壤可培养微生物数量与理化因子的相关性分析结果表明: 青藏公路沿线土壤微生物数量主要受纬度和土壤理化性质的影响, 表现为微生物数量与纬度和pH值显著负相关, 而与总氮、有机碳和含水量极显著正相关.

关键词: 青藏公路, 土壤养微生物, 微生物数量, 土壤理化性质, 环境因子

Abstract:

The changing trends in culturable microbe amount and its affect factors in the soils along the Qinghai-Tibet Highway were investigated in this paper. Along the highway, the amount of culturable microbes in the soils was in between 0.77×10⁶ cfu·g^-1dw and 2.44×10⁷ cfu·g^-1dw. Along the highway from south to north, the amount of culturable bacteria and fungi in the soils decreased first and then turned to stationary, while the amount of culturable actinomycetes decreased first and then increased. At the same time, the total nitrogen, total organic carbon and moisture content in the soils decreased, while the soil pH value increased gradually. The ratios of fungi/bacteria and C/N showed similar changing tendency, that is, increasing firstly and then decreasing. Correlation analyses between the environmental factors and the amounts of culturable microbes in the soils indicate that the microbial quantities in the soils are closely related to latitude and soil physicochemical properties. The microbial quantities have significant negative correlation with latitude and pH value of the soils, and have significant positive correlation with total nitrogen, total organic carbon and moisture content of the soils.

Key words: Qinghai-Tibet Highway, soil microbe, microbial quantity, soil physicochemical properties, environmental factors

中图分类号:

Q938

董康, 李师翁, 康文龙, 龙昊知, 刘光琇, 陈拓, 张威. 青藏公路沿线土壤微生物数量变化及其影响因素研究[J]. 冰川冻土, 2013, 35(2): 457-464.

DONG Kang, LI Shi-weng, KANG Wen-long, LONG Hao-zhi, LIU Guang-xiu, CHEN Tuo, ZHANG Wei. Study of the Changes in Microbe Amount and Its Affect Factorsin the Soils along the Qinghai-Tibet Highway[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2013, 35(2): 457-464.

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