| 引用本文: | 林晓,朱立平,王君波,汪勇,甄晓林,鞠建廷,谢曼平,彭萍.西藏纳木错表层沉积物中正构烷烃的来源与空间分布特征.湖泊科学,2009,21(5):654-662. DOI:10.18307/2009.0507 |
| LIN Xiao,ZHU Liping,WANG Junbo,WANG Yong,ZHEN Xiaolin,JU Jianting,XIE Manping,PENG Ping.Sources and spatial distribution character of n-alkanes in surface sediments of Nam Coon the Tibetan Plateau. J. Lake Sci.2009,21(5):654-662. DOI:10.18307/2009.0507 |
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| 西藏纳木错表层沉积物中正构烷烃的来源与空间分布特征 |
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林晓1,2, 朱立平2, 王君波2, 汪勇2,3, 甄晓林2,3, 鞠建廷4, 谢曼平2,3, 彭萍2,3
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1.中国地质大学生物地质与环境地质教育部重点实验室, 武汉 430074;2.中国科学院青藏高原研究所, 北京 100085;3.中国科学院研究生院, 北京 100049;4.《中国科学》杂志社, 北京 100717
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| 摘要: |
| 通过测定纳木错现代植物和表层沉积物样品中的正构烷烃,结合主成分分析方法,明确了表层沉积物中烷烃的主要来源,并初步分析了它们在湖泊中的空间分布特征.研究结果显示,沉水植物所含烷烃以n-C21-C25为主,具有n-C23的峰值;陆生植物主要含n-C27-C33烷烃,具有n-C29或n-C31的峰值;但垫状点地梅(Androsace tapete)和香柏(Sabina pingii)的主峰碳却是n-C33烷烃,这在以往研究中鲜有报道.在纳木错表层沉积物中,正构烷烃具有典型的n-C31和n-C23双峰分布形式,来源于低等菌藻类、沉水植物以及陆生植物.其中碳数小于C20的短链烷烃主要来源于低等菌藻类,其空间分布均一,由低等菌藻类的浮游生活型所决定;长链烷烃主要来源于高等植物,含量从滨岸到湖中心逐渐减少,这与其在运移和沉积过程中受微生物的持续降解作用有关.此外,来源于陆生植物的n-C27-C33烷烃因河流汇水面积和流量不同而存在空间差异,这值得重视和进一步研究. |
| 关键词: 表层沉积物 正构烷烃 空间分布 纳木错 青藏高原 |
| DOI：10.18307/2009.0507 |
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| 基金项目:国家重点基础研究发展计划项目(2005CB422002);国家自然科学基金项目(40701194);中国地质大学(武汉)优秀青年教师计划(CUGQNL0927) |
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| Sources and spatial distribution character of n-alkanes in surface sediments of Nam Coon the Tibetan Plateau |
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LIN Xiao1,2, ZHU Liping2, WANG Junbo2, WANG Yong2,3, ZHEN Xiaolin2,3, JU Jianting4, XIE Manping2,3, PENG Ping2,3
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1.Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, P.R.China;2.Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, P.R.China;3.Graduate University of CAS, Beijing l00049, P.R.China;4.Science in China Press, Beijing 100717, P.R.China
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| Abstract: |
| Aquatic and land plants as well as surface sediments from Nam Co in Tibetan Plateau were collected and n-alkanes analysishad been conducted to identify the sources and spatial distribution of these molecular. The results indicated that n-alkanes rangingfrom 21 to 25 were identified to be derived from submerged plants, while n-alkanes ranging from 27 to 33 with n-C29 or n-C31peakwere derived from land plants except Androsace tapete and Sabina pingii. These two species contain n-alkanes with n-C33 peak whichwere seldom reported before. Combined with information on plant sources and principal component analyses, three distinct groups ofn-alkanes with different spatial distribution in surface sediments were defined. Short-chain n-alkanes derived from photosyntheticbacteria and algae were relatively uniform in whole lake. But concentration of long chain n-alkanes gradually reduce from lake shoreto center coincided with transport distance increasing, indicating the main controlling mechanism of spatial distributions in surfacesediments was connected with biodegradation. |
| Key words: Surface sediments n-alkane spatial distribution Nam Co Tibetan Plateau |
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