Changes in wetland salinity, human activity and wetland vegetation abundances over the past 900 years

doi:10.1016/j.gloplacha.2019.103000

	Changes in wetland salinity, human activity and wetland vegetation abundances over the past 900 years
	Zhang, Yun; Kong, Zhaochen
	2019
发表期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
卷号	182
摘要	The birch wetland is an important type of oasis ecosystem in Xinjiang, China, which is extremely vulnerable to climate change and other disturbances. In this study, we aimed to understand the history of vegetation in such wetlands and find the key factors driving changes in the abundance of species inhabiting the wetlands of arid and semi-arid regions for over the past 900 years. Surface pollen samples were collected from 21 sites at altitudes between 750 m and 210 m, and 183 fossil samples were collected from the Ebinur and Caotanhu wetlands in north Xinjiang, China. Three different ground and surface water samples were collected from birch wetlands and the saline Ebinur Lake. The pollen and hydrochemical data were compared to examine the current interactions, and the knowledge thus gained was used to interpret historical changes in vegetation abundance in different regions (Ebinur and Caotanhu). The modem wetland landscape, surface pollen assemblage, and fossil pollen data from these areas together with hydrochemistry data concerning ground and surface water indicated that a local wetland ecosystem dominated by freshwater plants has been prevalent since 900 cal. a BP. The records show that Betula microphylla dominated the vegetation in the Caotanhu wetland from 900 to 700 cal. a BP; it subsequently declined and has now disappeared. In the Ebinur wetland, the vegetation cover of B. microphylla was at its highest between 270 and 220 cal. a BP; it is currently facing extirpation in the region. Our results, together with data concerning salinity and population statistics, indicate that both salinity and human activity have influenced wetland vegetation over the past 900 years. The two wetland ecosystems were dominated by freshwater plants during this period. At present, high salinity in the wetlands might be a key factor in driving the susceptible B. microphylla to extirpation. Increased human activity is an additional factor influencing changes in wetland vegetation. Overall, the results of our study on the interactions between wetland water and vegetation in different time periods (past and modern) and regions (Ebinur and Caotanhu) should be helpful for devising conservation strategies and conservation measures for B. microphylla in the semi-arid and arid areas of China.
关键词	Betula Pollen data Wetland salinity Human activity Vegetation abundance North Xinjiang
学科领域	Geography, Physical ; Geosciences, Multidisciplinary
DOI	10.1016/j.gloplacha.2019.103000
收录类别	SCI
语种	英语
WOS关键词	SURFACE POLLEN ASSEMBLAGES ; CLIMATE-CHANGE ; LAND-USE ; XINJIANG ; RECONSTRUCTION ; PRECIPITATION ; PLATEAU ; RECORDS ; ISLAND ; TIBET
WOS研究方向	Physical Geography ; Geology
WOS记录号	WOS:000490045000002
出版者	ELSEVIER
文献子类	Article
出版地	AMSTERDAM
EISSN	1872-6364
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41572331] ; Fundamental Research Funds of the Chinese Academy of Geological Sciences [YYWF201627] ; Strategic Priority Research Program of the Chinese Academy of SciencesChinese Academy of Sciences [XDA19050103]
作者邮箱	zhangygl@ibcas.ac.cn
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/19440
专题	植被与环境变化国家重点实验室
作者单位	Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Xiangshan Nanxincun 20, Beijing 100093, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yun,Kong, Zhaochen. Changes in wetland salinity, human activity and wetland vegetation abundances over the past 900 years[J]. GLOBAL AND PLANETARY CHANGE,2019,182.
APA	Zhang, Yun,&Kong, Zhaochen.(2019).Changes in wetland salinity, human activity and wetland vegetation abundances over the past 900 years.GLOBAL AND PLANETARY CHANGE,182.
MLA	Zhang, Yun,et al."Changes in wetland salinity, human activity and wetland vegetation abundances over the past 900 years".GLOBAL AND PLANETARY CHANGE 182(2019).

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