Relative pollen productivities of typical steppe species in northern China and their potential in past vegetation reconstruction  

作　　者：XU QingHai CAO XianYong TIAN Fang ZHANG ShengRui LI YueCong LI ManYue LI Jie LIU YaoLiang LIANG Jian 

机构地区：[1]Institute of Nihewan Archaeology, Hebei Normal University [2]College of Resources and Environment Science, Hebei Normal University, Hebei Key Laboratory of Environmental Change andEcological Construction [3]Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam [4]Potsdam 14473,Germany [5]Institute of Earth and Environmental Sciences, University of Potsdam

出　　处：《Science China Earth Sciences》2014年第6期1254-1266,共13页中国科学（地球科学英文版）

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA05120202);the National Natural Science Foundation of China(Grant Nos.41071132,41371215);Science and Technology Department of Hebei Province(Grant No.13277611D);the Foundation of Key Discipline of Hebei Province and Hebei Key Laboratory of Environmental Change and Ecological Construction

摘　　要：The Relative Pollen Productivities(RPPs)of common steppe species are estimated using Extended R-value(ERV)model based on pollen analysis and vegetation survey of 30 surface soil samples from typical steppe area of northern China.Artemisia,Chenopodiaceae,Poaceae,Cyperaceae,and Asteraceae are the dominant pollen types in pollen assemblages,reflecting the typical steppe communities well.The five dominant pollen types and six common types(Thalictrum,Iridaceae,Potentilla,Ephedra,Brassicaceae,and Ulmus)have strong wind transport abilities;the estimated Relevant Source Area of Pollen(RSAP)is ca.1000 m when the sediment basin radius is set at 0.5 m.Ulmus,Artemisia,Brassicaceae,Chenopodiaceae,and Thalictrum have relative high RPPs;Poaceae,Cyperaceae,Potentilla,and Ephedra pollen have moderate RPPs;Asteraceae and Iridaceae have low RPPs.The reliability test of RPPs revealed that most of the RPPs are reliable in past vegetation reconstruction.However,the RPPs of Asteraceae and Iridaceae are obviously underestimated,and those of Poaceae,Chenopodiaceae,and Ephedra are either slightly underestimated or slightly overestimated,suggesting that those RPPs should be considered with caution.These RPPs were applied to estimating plant abundances for two fossil pollen spectra(from the Lake Bayanchagan and Lake Haoluku)covering the Holocene in typical steppe area,using the"Regional Estimates of Vegetation Abundance from Large Sites"(REVEALS)model.The RPPs-based vegetation reconstruction revealed that meadow-steppe dominated by Poaceae,Cyperaceae,and Artemisia plants flourished in this area before 6500–5600 cal yr BP,and then was replaced by present typical steppe.The Relative Pollen Productivities（RPPs） of common steppe species are estimated using Extended R-value（ERV） model based on pollen analysis and vegetation survey of 30 surface soil samples from typical steppe area of northern China. Artemisia, Chenopodiaceae, Poaceae, Cyperaceae, and Asteraceae are the dominant pollen types in pollen assemblages, reflecting the typical steppe communities well. The five dominant pollen types and six common types（Thalictrum, Iridaceae, Potentilla, Ephedra, Brassicaceae, and Ulmus） have strong wind transport abilities; the estimated Relevant Source Area of Pollen（RSAP） is ca. 1000 m when the sediment basin radius is set at 0.5 m. Ulmus, Artemisia, Brassicaceae, Chenopodiaceae, and Thalictrum have relative high RPPs; Poaceae, Cyperaceae, Potentilla, and Ephedra pollen have moderate RPPs; Asteraceae and Iridaceae have low RPPs. The reliability test of RPPs revealed that most of the RPPs are reliable in past vegetation reconstruction. However, the RPPs of Asteraceae and Iridaceae are obviously underestimated, and those of Poaceae, Chenopodiaceae, and Ephedra are either slightly underestimated or slightly overestimated, suggesting that those RPPs should be considered with caution. These RPPs were applied to estimating plant abundances for two fossil pollen spectra（from the Lake Bayanchagan and Lake Haoluku） covering the Holocene in typical steppe area, using the ＂Regional Estimates of Vegetation Abundance from Large Sites＂（REVEALS） model. The RPPs-based vegetation reconstruction revealed that meadow-steppe dominated by Poaceae, Cyperaceae, and Artemisia plants flourished in this area before 6500–5600 cal yr BP, and then was replaced by present typical steppe.

关 键 词：typical steppe modern surface pollen relative pollen productivity relevant pollen source area PALEOVEGETATION 

分 类 号：S812[农业科学—草业科学]