植物与土壤中醇类化合物对高寒草甸退化指示作用初探

醇类化合物是一类重要的生物标记物,被广泛用于土壤及沉积物中有机物质的溯源。为探究醇类化合物对高寒草甸退化指示作用规律,采用野外调查与气相色谱质谱联用(GC-MS)分析方法,对高寒草甸植物与土壤中醇类进行测定和分析。结果表明,高寒草甸植物中醇种类数为2~21,碳数为4~37,不饱和醇种类数高于饱和醇。退化土壤中检出9-甲基-10-顺式十五烯-1-醇、2-亚甲基-5α-胆甾烷-3β-醇、1-三十七烷醇,而在未退化土壤中未检出。高寒草甸中植物和土壤醇的种类大小关系为退化植物退化土壤未退化植物未退化土壤,植物和土壤中相同的醇有很强的相关性(R2=0.871)。植物和土壤醇类的分布特征及相关性分析表明,醇类化合物可以用作标记物来指示高寒草甸退化。

Alcohols in plants and soil as indicators of alpine meadow degradation

Alcohols are an important class of biomarker and are widely used to trace the source of organic matter in soil and sediments.The present study was conducted to investigate the alcohol compositions of typical alpine meadows.The samples of alpine meadow plants and soil were collected,and gas chromatography-mass spec-trometry(GC-MS)analyses were carried out.The results showed that the range of alcohol types in the alpine meadow was from 2 to 21,the carbon number was from 4 to 37,and the number of unsaturated alcohols was higher than that of saturated alcohols.9-Methyl-Z-10-pentadecen-1-ol,(3,5)-2-methylene-Cholestan-3-ol,and 1-Heptatriacotanol were not detected in the non-degraded soil,but were found in the degraded soil.The species of plant and soil alcohols in alpine meadow were as follows:degraded plants > degraded soil > non-degraded plants > non-degraded soil.There was a strong correlation between the alcohols in the plants and those found in the soil(R2=0.871).The distribution characteristics and correlation analysis of plants and soil alcohols showed that alcohols could be used as markers to indicate the degradation of alpine meadow.