Arid
DOI10.1016/j.revpalbo.2017.08.004
A pollen rain-vegetation study along a 3600 m mountain-desert transect in the Irano-Turanian region; implications for the reliability of some pollen ratios as moisture indicators
Dehghani, Mehdi1; Djamali, Morteza2; Gandouin, Emmanuel2; Akhani, Hossein1
通讯作者Akhani, Hossein
来源期刊REVIEW OF PALAEOBOTANY AND PALYNOLOGY
ISSN0034-6667
EISSN1879-0615
出版年2017
卷号247页码:133-148
英文摘要

A set of 42 modern pollen samples has been investigated to determine the relationship between pollen percentages and vegetation composition along a 3600 m elevational mountain-desert transect in central Iran. The studied transect shows three main vegetation groups including a "high altitude zone" (embracing subnival, alpine and montane subzones), a "xerophytic desert steppe zone", and a "halophytic zone", correlated with the groups defined in Correspondence Analysis (CA) of vegetation dataset and Principal Component Analysis (PCA) of pollen dataset. The subnival subzone is characterized by high values of Asteraceae, Brassicaceae and Cyperaceae pollen, while alpine and montane subzones are characterized by the highest pollen diversity with a predominance of grass pollen along the whole transect. The halophytic zone is dominated by Chenopodiaceae pollen while xerophytic desert steppe shows a high occurrence of Artemisia pollen. The comparison of pollen percentages with the corresponding vegetation plots shows a high congruency between pollen and vegetation compositions of alpine subzone and undisturbed xerophytic desert steppe but a weak correlation between those of the subnival and montane subzones and human affected xerophytic desert steppe. In addition, pollen representation of frequently encountered or important plant taxa in the Irano-Turanian region is provided. The widely used Chenopodiaceae/Artemisia = C/A pollen ratio, as an aridity index, is shown to be unreliable in the Irano-Turanian steppes. Our results suggest that a combined graph of all four indices (C/A pollen ratio, Poaceae/Artemisia = P/A, Poaceae/Chenopodiaceae = P/C and (A + C)/P ratios) can represent the vegetation and climate relationships more accurately. In conclusion, surface pollen composition can reflect the actual vegetation zones/subzones in Irano-Turanian steppes. Together, P/A and P/C ratios are more confident to differentiate mesic from arid steppes, while C/A and (A + C)/P ratios provide a useful tool to differentiate halophytic desert vegetation developed in endorheic depressions with saline soils from xerophytic desert steppe developed in well-drained soils. (C) 2017 Elsevier B.V. All rights reserved.


英文关键词Chenopodiaceae/Artemisia pollen ratio Desert steppe Iranian flora Montane steppes Pollen assemblage Vegetation
类型Article
语种英语
国家Iran ; France
收录类别SCI-E
WOS记录号WOS:000417671300011
WOS关键词GLACIAL-INTERGLACIAL CYCLES ; CASPIAN HYRCANIAN FORESTS ; CO-INERTIA ANALYSIS ; QAIDAM BASIN ; MIDDLE-EAST ; LAKE URMIA ; RECORD ; ALBORZ ; MORPHOLOGY ; EVOLUTION
WOS类目Plant Sciences ; Paleontology
WOS研究方向Plant Sciences ; Paleontology
来源机构French National Research Institute for Sustainable Development
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/202039
作者单位1.Univ Tehran, Halophytes & Plants Res Lab C4, Dept Plant Sci, Sch Biol,Coll Sci, Tehran 141556455, Iran;
2.Avignon Univ, IMBE, Aix Marseille Univ, CNRS,IRD, Technopole Arbois Mediterranee,Bat Villemin,BP 80, F-13545 Aix En Provence 04, France
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Dehghani, Mehdi,Djamali, Morteza,Gandouin, Emmanuel,et al. A pollen rain-vegetation study along a 3600 m mountain-desert transect in the Irano-Turanian region; implications for the reliability of some pollen ratios as moisture indicators[J]. French National Research Institute for Sustainable Development,2017,247:133-148.
APA Dehghani, Mehdi,Djamali, Morteza,Gandouin, Emmanuel,&Akhani, Hossein.(2017).A pollen rain-vegetation study along a 3600 m mountain-desert transect in the Irano-Turanian region; implications for the reliability of some pollen ratios as moisture indicators.REVIEW OF PALAEOBOTANY AND PALYNOLOGY,247,133-148.
MLA Dehghani, Mehdi,et al."A pollen rain-vegetation study along a 3600 m mountain-desert transect in the Irano-Turanian region; implications for the reliability of some pollen ratios as moisture indicators".REVIEW OF PALAEOBOTANY AND PALYNOLOGY 247(2017):133-148.
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