干旱区生态环境知识资源中心(Arid): 柴达木盆地东部表土花粉分析

Arid

	柴达木盆地东部表土花粉分析
其他题名	A study on topllens in the east of Qaidam Basin
	陈辉 1; 吕新苗 1; 李双成 2
来源期刊	地理研究
ISSN	1000-0585
出版年	2004
卷号	23 期号:2 页码:201-210
中文摘要	柴达木盆地东部荒漠区8个样地、23个样点的表土花粉分析较好地揭示了荒漠区花粉组合的特点及其与植被、环境的关系。研究发现，荒漠区表土花粉以藜科(Chenopodiaceae)和蒿属(Artemisia)为主，并以前者占优势地位，麻黄属(Ephedra)亦较常见，禾本科(Gramineae)、菊科(Compositae)植物在群落中也占有一定的比例。花粉百分比含量DCA排序与相关分析发现，荒漠区不同植物群落下表土花粉组合特征各不相同，而且与相应的植物群落及其所代表的环境特征相一致。荒漠区表土花粉蒿／藜(Artemisia／Chenopodiaceae)比对干旱程度具有指示作用，比值越小，越干旱。
英文摘要	The features of pollen assemblages are dealt with in this paper using the methods of DCA and correlation analysis. Altogether 23 samples taken from topsoils at 8 sites in the east of Qaidam Basin are studied. In this study area, pollen taxa are mainly shrubs and herbs, whose total percentage is 92. 77%~100%. Pteridophyta pollen is found in 5 samples, but the percentage is quite low, only less than 0. 38%. This pollen assemblage clearly shows the characteristics of obvious desert and steppe desert area without trees.In the pollens of shrubs and herbs, Artemisia and Chenopodiaceae dominate in desert area, being respectively about 40% and 70% in general and 66. 38% and 74. 54% at maximum. Comparatively, Ephedra is also commonly seen, whose percentage is usually less than 5%, but in 6 samples the percentage is more than 10% and 49. 27% at maximum. Gramineae and Compositae also occupy a certain percentage, the maximum may reach 10.6% and 6.82%.Results of DCA and correlation analysis appear that the features of topsoil pollens in different vegetations are not the same. Different assemblages of pollens can be distinguished and are in accordance with corresponding vegetations and environments. According to the aridity, the vegetation communities are divided into four groups: severe drought group, moderate drought group, slight drought group and slight-drought-and-slight-wet-ness group and it is found that A/C (Artemisia/ Chenopodiaceae) in the desert can indicate the aridity. A/C value is less 0. 2 in the severe drought group, 0. 2 - 0. 5 in the moderate drought group, 1. 63 in the slight drought group and 5. 72 in the slight-drought-and-slight-wetness group with aridities being 8. 96, 3. 00, 2. 98 and 2. 82 respectively.
中文关键词	柴达木盆地东部
英文关键词	East Qaidam Basin
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:1620588
来源机构	中国科学院地理科学与资源研究所 ; 北京大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/204891
作者单位	1.中国科学院地理科学与资源研究所, 北京 100101, 中国; 2.北京大学环境学院, 北京 100871, 中国
推荐引用方式 GB/T 7714	陈辉,吕新苗,李双成. 柴达木盆地东部表土花粉分析[J]. 中国科学院地理科学与资源研究所, 北京大学,2004,23(2):201-210.
APA	陈辉,吕新苗,&李双成.(2004).柴达木盆地东部表土花粉分析.地理研究,23(2),201-210.
MLA	陈辉,et al."柴达木盆地东部表土花粉分析".地理研究 23.2(2004):201-210.