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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
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
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
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
分类号:
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)
Sources and spatial distribution character of n-alkanes in surface sediments of Nam Coon the Tibetan Plateau
LIN Xiao1,2, ZHU Liping2, WANG Junbo2, WANG Yong2,3, ZHEN Xiaolin2,3, JU Jianting4, XIE Manping2,3, PENG Ping2,3
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
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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