马雪云^1,2,3,,
魏志福^1,2,,,
王永莉⁴,
汪亘^1,2,
巩俊成^1,2,
张婷^1,2,3,
何薇^1,2,3,
玉晓丽^1,2,3
1. 中国科学院西北生态环境资源研究院, 甘肃 兰州 730000
2. 甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室, 甘肃 兰州 730000
3. 中国科学院大学, 北京 100049
4. 中国科学院地质与地球物理研究所, 中国科学院新生代地质与环境重点实验室, 北京 100029

基金项目: 国家重点研究发展计划项目（批准号：2017YFA0604803）、国家自然科学基金项目（批准号：41572350和41503049）、西部之光一般项目以及甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室开放课题（批准号：1309RTSA041）共同资助


详细信息

作者简介: 马雪云, 男, 26岁, 硕士研究生, 有机地球化学专业, E-mail:maxueyun17@mails.ucas.ac.cn

通讯作者: 魏志福, E-mail:weizf@lzb.ac.cn

中图分类号: P941.78;P593;P534.63⁺2;P532

收稿日期:2018-05-07
修回日期:2018-07-19
刊出日期:2018-09-30

C₃/C₄ vegetation evolution recorded by lake sediments in the Huola basin, Northeast China since the Last Glacial Maximun

Ma Xueyun^1,2,3,,
Wei Zhifu^1,2,,,
Wang Yongli⁴,
Wang Gen^1,2,
Gong Juncheng^1,2,
Zhang Ting^1,2,3,
He Wei^1,2,3,
Yu Xiaoli^1,2,3
1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu
2. Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Chinese Academy of Sciences, Lanzhou 730000, Gansu
3. University of Chinese Academy of Sciences, Beijing 100049
4. Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029


More Information

Corresponding author: Wei Zhifu,E-mail:weizf@lzb.ac.cn

MSC: P941.78;P593;P534.63⁺2;P532

--> Received Date: 07 May 2018
Revised Date: 19 July 2018
Publish Date: 30 September 2018


摘要
摘要:利用气相色谱-质谱（GC-MS）联用技术对我国大兴安岭北部霍拉盆地湖泊沉积物进行了有机分子地球化学分析，检测出了丰富的正构烷烃。本研究主要讨论了正构烷烃的分布特征及其长链正构烷烃的单体碳同位素组成，结合AMS ¹⁴C年代数据，重建中国东北大兴安岭地区末次冰盛期以来的古植被及古气候变化。正构烷烃分布特征表明，末次冰盛期以来，霍拉盆地湖沼沉积物长链正构烷烃呈现明显的奇碳优势，主峰碳主要为nC₃₁，指示有机质主要来源于陆生高等植物，且草本植物输入占优势，木本植物输入丰富。陆生高等植物来源的长链正构烷烃单体稳定碳同位素的记录显示，末次冰盛期晚期以来古莲剖面沉积物长链正构烷烃（nC₂₇、nC₂₉和nC₃₁）稳定碳同位素整体偏负；此外，利用二元模式估算了C₃/C₄植物相对生物量，结果表明，自末次冰盛期以来我国东北大兴安岭地区C₃植物占绝对优势，然而在全新世大暖期C₄植物生物量呈现明显扩张趋势，这表明气候变暖对C₄植物量的增加有重要影响。
关键词: 湖泊沉积物/
正构烷烃/
长链烷烃单体碳同位/
古植被/
大兴安岭地区

Abstract:The Huola River basin(52°57'N~53°03'N, 121°52'E~122°04'E), located in Heilongjiang Province, belongs to the northern part of the Daxing'anling permafrost region. The Gulian profile(53°00'38.88"N, 121°57'48.24"E) is developed in the Huola valley basin around the mountain at an elevation of 535 m. The thickness of this section is 300 cm with a gravel bottom. The lower part(300~70 cm) is typical lake sediments and the upper part (70~0 cm) is peat. A total of 150 samples were collected with an interval of 2 cm. Five charcoal samples were sent to the Australian Nuclear Science and Technology Center Ansto Accelerator Laboratory for AMS ¹⁴C dating. The characteristics of biomarkers extracted from the limnological sediments taken from Gulian Section of Huola basin in Northern Daxing'anling were systematically analyzed by gas chromatography-mass spectrometry (GC/MS) for the first time. Besides, Compound-specific carbon isotopic composition was tested by mass spectrometer (Trace GC, MAT 253). Combined with ¹⁴C dating, the paleovegetation and paleoclimatic changes since the Last Glacial Maximum period in the Daxing'anling region of Northeast China were reconstructed. The distribution of (nC₂₇, nC₂₉ and nC₂₉) n-alkanes indicated that the long-chain n-alkanes of the lake sediments in the Gulian section of Huola Basin had obvious odd carbon advantages and the main peak carbon is mainly nC₃₁ since the Late Glacial period, indicating that the organic matters were mainly derived from terrestrial plants. The n-alkanes index(nC₂₇/nC₃₁) had a distribution range of 0.43~1.01, suggesting that the input of herbs was dominated, and the input of woody plants was abundant. The stable carbon isotope records(-35.7 ‰ < δ¹³nC₂₇ < -32.0 ‰, -36.7 ‰ < δ¹³nC₂₉ < -32.4 ‰) of long-chain normal n-alkanes derived from terrestrial plants showed that the stable carbon isotope of the long-chain n-alkanes (nC₂₇, nC₂₉ and nC₃₁) in the Gulian section was negative since the last glacial period. The binary model was used to estimate the relative biomass of C₃/C₄ plants. The results showed that C₃ plants in the Daxing'anling region of Northeast China had an absolute advantage since the last glacial period. However, the proportion of C₄ plants in the Holocene warm period relatively increased, and C₄ plants showed an expansion trend, indicating that warm climate had an important contribution to the increase of C₄ plants.
Key words:lacustrine sediments/
n-alkanes/
δ¹³C of long-chain n-alkanes/
paleovegetation/
Daxing'anling region



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