干旱区生态环境知识资源中心(Arid): 柴达木盆地东北部地区表土花粉研究

Arid

	柴达木盆地东北部地区表土花粉研究
其他题名	Surface-soil pollen research in northeastern Qaidam Basin
	梅换 1; 程波 1; 周姗 1; 黄于峡 1; 张家武 2
来源期刊	兰州大学学报. 自然科学版
ISSN	0455-2059
出版年	2019
卷号	55 期号:6 页码:797-807
中文摘要	通过柴达木盆地东北部地区不同植被类型的32个表土样品花粉分析与植被调查,对本区现代表土花粉组合及其与植被类型之间的关系进行了研究.结果表明,柴达木盆地东北部地区不同的植被类型具有相对独特的花粉组合特征.高寒荒漠花粉组合为禾本科+菊科+藜科型,高山草甸花粉组合为莎草科+禾本科+紫菀+菊科型,草原花粉组合为菊科+蒿属+禾本科+藜科型,荒漠草原花粉组合为蒿属+藜科+禾本科+菊科型,荒漠花粉组合为藜科+白刺+蒿属型,隐域草甸花粉组合为禾本科+藜科+莎草科+蒿属型;柴达木盆地东北部地区花粉与植物之间的关系复杂,同一花粉在不同植被类型中的代表性存在差异.蒿、藜花粉基本呈超代表性,但是在藜科植物占优势的荒漠中,藜科花粉呈等代表性.禾本科花粉在高寒荒漠呈超代表性,在高山草甸、草原、荒漠草原、荒漠及隐域草甸均呈低代表性.菊科花粉在高寒荒漠呈超代表性,在高山草甸呈等代表性,在草原、荒漠草原及荒漠呈低代表性.莎草科花粉在高山草甸呈等代表性,在高寒荒漠、草原及隐域草甸呈低代表性.白刺花粉呈等代表性.蔷薇科、豆科花粉呈低代表性;主成分分析结果显示,湿度条件的变化可能是影响柴达木盆地东北部地区各个植被类型花粉组合特征的主要因素.高山草甸、草原、荒漠的样品在前两个主因子组成的坐标系中差异明显,能较好地区分开.但高寒荒漠、荒漠草原和草原的样品因花粉组合较相似而难以区分;蒿/藜可以作为反映干湿状况的良好指标,但蒿藜花粉之和应$ ge 20\% $.本研究中,蒿藜花粉之和在高山草甸中平均含量$ < 20\% $,蒿/藜偏低,不能反映高山草甸的湿润状况.高寒荒漠、草原、荒漠草原、荒漠中蒿藜花粉之和平均含量$ > 20\% $,蒿/藜从草原-荒漠草原-荒漠逐渐降低,反映出环境逐渐干燥的趋势.蒿/莎草可以将高山草甸及其他植被类型区分开.
英文摘要	Through pollen analysis of 32 surface-soil samples from different vegetation types in northeastern Qaidam Basin and corresponding vegetation investigations, the pollen assemblage and its relationship with vegetation types were comprehensively studied. The results showed that different vegetation types were characterized by a unique pollen assemblage. Alpine desert pollen assemblage was Poaceae+Astera-ceae+Chenopodiaceae, alpine meadow Cyperaceae+Poaceae+Aster+Asteraceae, and steppe Asteraceae+ Artemisia+Poaceae+Chenopodiaceae. The pollen assemblage of desert steppe was Artemisia+Chenopodi-aceae+Poaceae+Asteraceae, desert Chenopodiaceae+Nitraria+Artemisia, and azonal meadow Poaceae+ Chenopodiaceae+Cyperaceae+Artemisia. The relationship between pollen and plants in northeastern Qaidam Basin was complex, and the representation of the same pollen varied in different vegetation types. Artemisia and Chenopodiaceae had a high representation, but in the desert dominated by Chenopodiaceae, it had moderate representation. Poaceae showed a high representation in alpine desert, but low representation in alpine meadow, steppe, desert steppe, desert, and azonal meadow. Asteraceae had a high representation in alpine desert, moderate in alpine meadow and low in steppe, desert steppe, and desert. Cyperaceae had moderate representation in alpine meadow, and low in alpine desert, steppe and azonal meadow. Nitraria exhibited a moderate representation. Rosaceae and Fabaceae showed a low representation. Principal component analysis showed that changes in humidity might be the main factor affecting pollen assemblage characteristics of various vegetation types in northeastern Qaidam Basin. Surface-soil samples of alpine meadow, steppe, and desert differ significantly in the coordinate systems were composed by the first two principal factors and could be well separated. Surface-soil samples of alpine desert, desert steppe and steppe were difficult to be distinguished due to their similar pollen assemblages; Artemisia/Chenopodiaceae (A/C) ratio could be used as a good indicator to identify dry and wet conditions,but the sum of Artemisia and Chenopodiaceae abundance should not be less than 20%. In this study, the sum of Artemisia and Chenopodiaceae abundance in alpine meadow was less than 20% and the A/C ratio was extremely low, which did not reflect the wet condition of an alpine meadow. The average content of Artemisia and Chenopodiaceae in alpine desert, steppe, desert steppe, and desert was $ > 20\% $, and the A/C ratio gradually decreased from steppe, steppe desert to desert, reflecting the gradual drying condition of the environment. Alpine meadow and other vegetation types can be distinguished by using Artemisia/ Cyperaceae ratio.
中文关键词	表土花粉组合 ; 花粉代表性 ; 蒿/藜 ; 蒿/莎草 ; 柴达木盆地东北部
英文关键词	surface-soil pollen assemblage pollen representation Artemisia/Chenopodiaceae ratio Artemisia/Cyperaceae ratio northeastern Qaidam Basin
语种	中文
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6663512
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/316280
作者单位	1.华中师范大学, 地理过程分析与模拟湖北省重点实验室, 武汉, 湖北 430079, 中国; 2.兰州大学, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	梅换,程波,周姗,等. 柴达木盆地东北部地区表土花粉研究[J]. 兰州大学,2019,55(6):797-807.
APA	梅换,程波,周姗,黄于峡,&张家武.(2019).柴达木盆地东北部地区表土花粉研究.兰州大学学报. 自然科学版,55(6),797-807.
MLA	梅换,et al."柴达木盆地东北部地区表土花粉研究".兰州大学学报. 自然科学版 55.6(2019):797-807.