干旱区生态环境知识资源中心(Arid): A high-resolution climate history of geochemical and biological proxies from a tropical freshwater wetland located in the Kenyan Rift Valley

Arid

DOI	10.1016/j.jafrearsci.2019.103703
	A high-resolution climate history of geochemical and biological proxies from a tropical freshwater wetland located in the Kenyan Rift Valley
	Goman, M. F.1; Ashley, G. M.2; Owen, R. B.3; Driese, S. G.4; Muasya, A. M.5; Hover, V. C.6
通讯作者	Goman, M. F.
来源期刊	JOURNAL OF AFRICAN EARTH SCIENCES
ISSN	1464-343X
EISSN	1879-1956
出版年	2020
卷号	162
英文摘要	The sedimentary and biological material preserved in wetlands in semi-arid regions provide a rich repository of paleoclimate and paleoecological archives. These records reflect an underutilized, but typically ignored paleoenvironmental resource in semi-arid settings. The results presented here demonstrate that groundwater-fed wetlands constitute a valuable record of environmental change that not only complement reconstructions from lacustrine settings, but also contribute unique data and insights into climate and landscape change. We use data obtained from sediment cores collected from Loboi wetland, a groundwater-fed wetland located in the Equatorial East African Rift Valley of Kenya, to demonstrate the value of paleoenvironmental datasets extracted from wetland archives. This article relates surficial sedimentary geochemical data (TOC, delta C-13, delta N-15, C:N, and %C3) at Loboi to the extant macrophytic vegetation. The surficial data are used as an analog to interpret the geochemical signature of three sediment cores and a soil pit. The stratigraphic records show significant variation along a north to south transect through the wetland. The geochemistry indicates that papyrus wetland records are distinctly different from Typha dominated wetland sedimentary signatures. The interpretation of the stratigraphic material is further improved by the inclusion of sub-fossil macrophyte and testate amoebae remains. The extraction and identification of seeds of wetland plants from the sedimentary archive provide invaluable genus to species specific details of wetland ecology. Further, the inclusion of testate amoebae as an indicator of surface hydrological conditions has significantly improved interpretation of the hydrological history of Loboi wetland. The stratigraphic record from Loboi indicates that between similar to 1100 and 1470 C.E. (Medieval Climatic Anomaly) dry conditions dominated the Loboi region, except for a brief period of wetter conditions between similar to 1275 and 1345 C.E. Seasonally wetter conditions began to persist between -1470 and 1630 C.E. Wetland sediments developed after this time as reflected by the sequestration of carbon in the sedimentary record. Recent historic biological and sedimentary proxies reflect increased agrarian impacts on the landscape surrounding Loboi.
英文关键词	Equatorial East Africa Groundwater-fed wetland Last millennium Magnetic susceptibility Testate amoebae Geochemistry
类型	Article
语种	英语
国家	USA ; Peoples R China ; South Africa
收录类别	SCI-E
WOS记录号	WOS:000509618000020
WOS关键词	EAST-AFRICA ; LATE-HOLOCENE ; RAINFALL VARIABILITY ; LAKE VICTORIA ; HUMAN IMPACT ; GROUNDWATER ; SEDIMENTS ; BOGORIA ; RECORD ; LOBOI
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
EI主题词	2020-02-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312675
作者单位	1.Sonoma State Univ, Dept Geog Environm & Planning, 1801 E Cotati Ave, Rohnert Pk, CA 94928 USA; 2.Rutgers State Univ, Dept Earth & Planetary Sci, Busch Campus,610 Taylor Rd, Piscataway, NJ 08854 USA; 3.Hong Kong Baptist Univ, Dept Geog, Kowloon Tong, 12-F,Acad & Adm Bldg,15 Baptist Univ Rd, Hong Kong, Peoples R China; 4.Baylor Univ, Dept Geosci, Terr Paleoclimate Res Grp, Waco, TX 76798 USA; 5.Univ Cape Town, Dept Biol Sci, ZA-7701 Rondebosch, South Africa; 6.Washtenaw Community Coll, Dept Math Sci & Engn, 4800 E Huron River Dr, Ann Arbor, MI 48105 USA
推荐引用方式 GB/T 7714	Goman, M. F.,Ashley, G. M.,Owen, R. B.,et al. A high-resolution climate history of geochemical and biological proxies from a tropical freshwater wetland located in the Kenyan Rift Valley[J],2020,162.
APA	Goman, M. F.,Ashley, G. M.,Owen, R. B.,Driese, S. G.,Muasya, A. M.,&Hover, V. C..(2020).A high-resolution climate history of geochemical and biological proxies from a tropical freshwater wetland located in the Kenyan Rift Valley.JOURNAL OF AFRICAN EARTH SCIENCES,162.
MLA	Goman, M. F.,et al."A high-resolution climate history of geochemical and biological proxies from a tropical freshwater wetland located in the Kenyan Rift Valley".JOURNAL OF AFRICAN EARTH SCIENCES 162(2020).