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Holocene vegetation cover in Qin'an area of western Chinese Loess Plateau revealed by n-alkane.
- Source :
- Chinese Science Bulletin; Jun2007, Vol. 52 Issue 12, p1692-1698, 7p, 1 Diagram, 2 Graphs, 1 Map
- Publication Year :
- 2007
-
Abstract
- Previous studies have found that wetlands prevailed in western Chinese Loess Plateau and pine pollen could reach up to 80% in Qin'an area of the plateau during middle Holocene. It was then deduced that forest vegetation covered Qin'an area in a warm and wet climate during middle Holocene. The proxies of molecule biomarkers from two Holocene sections, a swamp-alluvial loess section and a typical loess-paleosol section are used to reconstruct regional vegetation history. It is found that the heavy-molecular-weight (HMW) homobogues of the n-alkanes in all samples exhibit a pronounced odd-over-even predominance, maximizing at C<subscript>31</subscript> and the abundance of the nC<subscript>27</subscript>-alkanes is the lowest in nC<subscript>27</subscript>, nC<subscript>29</subscript>, nC<subscript>31</subscript>, i.e. C<subscript>27</subscript><C<subscript>29</subscript><C<subscript>31</subscript>, a typical grass n-alkanes model. The results are the same as those of model surface soil samples under grass cover but different from both forest cover and modern pine leaves, which yield preferentially nC<subscript>29</subscript>-alkanes peak. It could be inferred that the area was dominated by grass cover but not forest cover during whole Holocene epoch. The study shows that combining both molecule biomarkers and pollen analysis can avoid the disadvantage of pollen analysis in reconstruction of regional vegetation cover. [ABSTRACT FROM AUTHOR]
- Subjects :
- BIOMARKERS
PLATEAUS
HOLOCENE stratigraphic geology
Subjects
Details
- Language :
- English
- ISSN :
- 10016538
- Volume :
- 52
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Chinese Science Bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 26377548
- Full Text :
- https://doi.org/10.1007/s11434-007-0263-4