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Stable carbon isotope records of black carbon on Chinese Loess Plateau since last glacial maximum: An evaluation on their usefulness for paleorainfall and paleovegetation reconstruction
Wang, Xu1; Cui, Linlin2; Yang, Shiling1; Zhai, Jixuan1; Ding, Zhongli1
2018-11-15
发表期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
卷号509页码:98-104
摘要Stable carbon isotope composition of soil organic matter (delta C-13(SOM)) has been widely used to infer past environmental or vegetation (C-3/C-4) changes. However, as a carbonaceous product of incomplete burning of biomass, the carbon isotope signature of black carbon (BC) has received little study and a limited usage on this purpose. Moreover, the environmental or vegetation indication of BC carbon isotope composition (delta C-13(BC)) in sedimentary records remains ambiguous although the delta C-13(BC) is supposed to reflect carbon isotope composition of vegetation being burnt. This deserves site-specific studies. Here we analyzed delta C-13(BC) and delta C-13(SOM) on loess-paleosol samples from Lijiayuan and Yangling sections on Chinese Loess Plateau (CLP) spanning the last glacial maximum to decipher the environmental (or vegetation) meaning of delta C-13(SOM) at each study site. Opposite changing patterns were observed on the delta C-13(BC) values for the two sections. The delta C-13(BC) at Yangling (in southern part of the CLP) varied from - 19.18 parts per thousand to - 21.93 parts per thousand (mean: - 20.62 parts per thousand) with more positive values occurred during the middle Holocene than those during the LGM, demonstrating more C-4 plants occupied in the region during the warm-humid middle Holocene. This is consistent with the changing pattern widely-documented in delta C-13(SOM) records over the CLP during the same period. By contrast, the delta C-13(BC) at Lijiayuan (in northwestern part of the CLP) changed within the range of - 21.83 parts per thousand similar to -24.64 parts per thousand (mean: - 23.34 parts per thousand) and displayed more negative values during the early-middle Holocene with respect to the LGM period. The delta C-13(BC) at Lijiayuan were about 2.5 parts per thousand lower than those at Yangling, indicating a northward decrease of C-4 plants on the CLP. The anti-phased changes of delta C-13(BC) at Lijiayuan were considered to reflect variations in paleorainfall because the vegetation is dominated by C-3 plants at the study site and carbon isotope compositions of C-3 plants decrease as rainfall increases. Compared with delta C-13(SOM) record at the same profile, delta C-13(BC) seem biased against capturing C-4 signal during mid-Holocene possibly due to dominance of C-3 plants at the study site during fire seasons and a potentially extra source of BC from forest fires occurred on surrounding mountains. By contrast, delta C-13(BC) tend to exaggerate C-4 signal during the LGM attributed to a possible shift of fire season from spring to summer. These findings suggest that we probably underestimate the abundance of C-4 plants during mid-Holocene and overestimate C-4 biomass during the LGM using BC carbon isotope composition. (C) 2017 Elsevier B.V. All rights reserved.
关键词Black carbon Soil organic matter Carbon isotope composition, C-3/C-4 plants Rainfall Chinese Loess Plateau
DOI10.1016/j.palaeo.2017.08.008
资助者Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China
关键词[WOS]EAST-ASIAN MONSOON ; INNER-MONGOLIA ; NORTHERN CHINA ; DAIHAI LAKE ; ENVIRONMENTAL-CHANGES ; PALEOSOL SEQUENCE ; ELEMENTAL CARBON ; PLANT ABUNDANCE ; ORGANIC-MATTER ; WESTERN PART
语种英语
资助项目Chinese Academy of Sciences[XDPB05] ; National Natural Science Foundation of China[41572163] ; National Natural Science Foundation of China[41603013]
资助者Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS研究方向Physical Geography ; Geology ; Paleontology
WOS类目Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号WOS:000447578200009
出版者ELSEVIER SCIENCE BV
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文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/89203
专题新生代地质与环境院重点实验室
通讯作者Wang, Xu
作者单位1.Chinese Acad Sci, Key Lab Cenozo Geol & Environm, Inst Geol & Geophys, POB 9825, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, POB 9825, Beijing 100029, Peoples R China
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Wang, Xu,Cui, Linlin,Yang, Shiling,et al. Stable carbon isotope records of black carbon on Chinese Loess Plateau since last glacial maximum: An evaluation on their usefulness for paleorainfall and paleovegetation reconstruction[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2018,509:98-104.
APA Wang, Xu,Cui, Linlin,Yang, Shiling,Zhai, Jixuan,&Ding, Zhongli.(2018).Stable carbon isotope records of black carbon on Chinese Loess Plateau since last glacial maximum: An evaluation on their usefulness for paleorainfall and paleovegetation reconstruction.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,509,98-104.
MLA Wang, Xu,et al."Stable carbon isotope records of black carbon on Chinese Loess Plateau since last glacial maximum: An evaluation on their usefulness for paleorainfall and paleovegetation reconstruction".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 509(2018):98-104.
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