【摘要】 利用GC-MS(气相色谱—质谱仪),对采自湖北清江流域和尚洞洞顶的土壤样品与洞内石笋样品进行分析,发现土壤中存在的七个系列单甲基支链烷烃在所有的石笋样品中均可以找到,呈现相似的分布模式,石笋中七个系列支链烷烃有可能来自洞穴滴水携带的土壤中的支链烷烃,但是也不能排除石笋原地生长的微生物的贡献。烷基环己烷的分布在土壤与石笋中呈现了相似的分布模式,但是主峰碳数有所变化,高碳数部分与低碳数部分的相对含量也发生了变化。主要原因可能是微生物选择性降解的结果,也有可能是土壤与石笋中微生物种类分布差异所造成的。本次研究初步显示了相对封闭稳定的洞穴沉积物与上覆土壤层中生物标志化合物的异同。更多还原

【Abstract】 Using GC/MS analysis,we find the monoethylalkanes and alkylcyclohexanes in the soil and stalagmite samples.Seven series of monoethylalkanes found in the soil can also be detected in the stalagmite and they exhibit the same distribution patterns.The monoethylalkanes in the stalagmite possibly derive from the soil on the top of the cave that transported by the drip water.But we can not exclude the contribution of the microorganisms living on the stalagmite.Alkylcyclohexanes exhibit the different maxima in the soil and the stalagmite. These phenomena may be caused by the selective degradation or different microorganism distribution in the stalagmite and soil.This research reveals the similarities and differences of the biomarker in the soil and stalagmite.更多还原