摘要
利用GC-MS对西北干旱区一半干旱区兰州兴隆山森林区典型植被与现代土壤样品中可抽提的类脂物进行了系统分析，检测出包括正构烷烃和α-正构脂肪酮等一系列类脂物分子化石。在未进行族分离的情况下，检出兴隆山现代森林木本植物的正构烷烃以C27或C29为主峰，草本植物则以C31为主峰；土壤样品中均保留有很强的、几乎均势的C27，C29和C31信号；α-正构脂肪酮具有明显的奇碳优势，植物中以C23，C25或C29为主峰，土壤样品以C27或C29为主峰；其反映的信息是植被与微生物共同作用的结果。本研究为理解现代土壤和古土壤中类脂物所指示的植被信息、进一步探讨类脂物分子在植被（有机质）-微生物-土壤-湖泊沉积体系中存在与相互转换关系这一基础理论问题提供了科学资料。同时，为分子化石分析方法的改进和不同处理过程所得数据之间的对比和科学解释提供资料。
Using Gas Chromatography-Mass Spectrometry（GC-MS） to measure the organic compounds of living plants and modern soils in different bioclimatological areas is of great importance to understand the environmental influence on organic signals obtained from geological archives. A series of biomarkers,including n-alkanes and n-alkan-2-ones, were identified from typical plants, such as broadleaved-deciduous trees and conifers as well as from modern soils collected from the Xinglong Mountain, North West China. The n-alkanes of vegetations were changeable even though the trees had carbon number peakings at C27 and C29 ,whereas grasses at C31. On the other hand,the carbon numbers in the forest soil show not only the C27 and C29 peaks,but also a strong peak at C31. The CPIh value of plant had a large variation from 1.47 - 12.27. Both R1/Rh and ACL values show obvious changes but generally with a similar trend. The CPIh , R1/Rh and ACL indices from soils show very similar patterns and clearly indicates that the organic matters in the soil were originated from higher plants. However, the range of these indices in soil sections changed systematically from the top to the bottom,indicating that microbial and physicochemical processing had a significant effect on molecular signals in the organic matter, which means the microorganism and bacteria had unneglectable contribution to the property of the organic matter. Large amount of n-alkan-2-one, characterizing preferential odd carbon numbers were identified. They were dominated by high carbon numbers which peaked at C27 and C29,indicating that the n-alkan-2-one in soil samples were originated from higher plants,while the appearance of n-alkan-2-one with low carbon numbers indicating that microorganism may have played an important role in soil formation processes. The distribution patterns of n-alkan-2-one were comparable to that of n-alkanes in soils, implying that they had a close relationship to each other and the n-alkan-2-one might be resulted from the oxidization of n-
出处
《第四纪研究》
CAS
CSCD
北大核心
2009年第1期159-165,共7页
Quaternary Sciences
基金
中国科学院“百人计划”项目和国家自然科学基金项目（批准号：40871096）资助
