Sensitive response of desert vegetation to moisture change based on a near-annual resolution pollen record from Gahai Lake in the Qaidam Basin, northwest China

被引：81

作者：

Zhao, Yan ^{[1
]}

Yu, Zicheng ^{[1
,2
]}

Chen, Fahu ^{[1
]}

Liu, Xiuju ^{[1
]}

Ito, Emi ^{[3
]}

机构：

[1] Lanzhou Univ, Coll Earth & Environm Sci, MOE Key Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China

[2] Lehigh Univ, Dept Earth & Environm Sci, Bethlehem, PA 18015 USA

[3] Univ Minnesota, Limnol Res Ctr, Dept Geol & Geophys, Minneapolis, MN 55455 USA

来源：

GLOBAL AND PLANETARY CHANGE | 2008年 / 62卷 / 1-2期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

fossil pollen; A/C ratio; effective moisture; climate data; Gahai Lake; Qaidam Basin;

D O I：

10.1016/j.gloplacha.2007.12.003

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

We present a 50-year pollen record at near-annual resolution from Gahai Lake in the Qaidam Basin on the northeastern Tibetan Plateau. Chronology of a 22-cm short core was established by Pb-210 and Cs-117 analysis. The pollen results at 0.5 cm intervals show large changes in Artemisia/Chenopodiaccae (A/C) ratios from <0.2 to 0.95 in the last 50 years. High (low) A/C ratios represent increase (decrease) in steppe pollen production, which correspond to high (low) relative humidity observed at nearby Delingha weather station. On the basis of good correspondence with instrumental records and carbonate content from Gahai Lake, we conclude that A/C ratio is sensitive to moisture change and can be a very useful index in reconstructing paleoclimate of and regions. Comparison with pollen and snow accumulation data from Dunde ice core suggests that effective moisture at low and high elevations shows the opposite relationship when mountain precipitation was extremely high, possibly due to topography-induced uplifting and subsiding air dynamics. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：107 / 114

页数：8

共 31 条

[1]

Binford M.W., 1990, J PALEOLIMNOL, V3, P253, DOI [10.1007/BF00219461, 10.1007/bf00219461]

[2]

BROCCOLI AJ, 1992, J CLIMATE, V5, P1181, DOI 10.1175/1520-0442(1992)005<1181:TEOOOM>2.0.CO

[3]

[4] A paleoclimate record for the past 250,000 years from Summer Lake, Oregon, USA: II. Sedimentology, paleontology and geochemistry [J].

Cohen, AS ;

Palacios-Fest, MR ;

Negrini, RM ;

Wigand, PE ;

Erbes, DB .

JOURNAL OF PALEOLIMNOLOGY, 2000, 24 (02) :151-182

[5] Vegetational and climatic significance of modern pollen rain in northwestern Tibet [J].

Cour, P ;

Zheng, Z ;

Duzer, D ;

Calleja, M ;

Yao, Z .

REVIEW OF PALAEOBOTANY AND PALYNOLOGY, 1999, 104 (3-4) :183-204

[6] Modern pollen precipitation from an elevational transect in central Jordan and its relationship to vegetation [J].

Davies, CP ;

Fall, PL .

JOURNAL OF BIOGEOGRAPHY, 2001, 28 (10) :1195-1210

[7] Tenth anniversary volume [J].

Davis, JA ;

Kertzer, DI .

JOURNAL OF MODERN ITALIAN STUDIES, 2005, 10 (01) :1-2

[8]

EIMOSLIMANY AP, 1990, REV PALAEOBOT PALYNO, V64, P343

[9]

GRIMM EC, 1992, COMPUT GEOSCI, V13, P13

[10]

GUNIN PD, 1999, VEGETATION DYNAMICS, P46

← 1 2 3 4 →