The isotopic response of Lake Chenghai, SW China, to hydrologic modification from human activity

ISL OpenIR > 青海盐湖研究所知识仓储

	The isotopic response of Lake Chenghai, SW China, to hydrologic modification from human activity
	Hillman, Aubrey L.1,4; Abbott, Mark B.1; Yu, JunQing2 ; Steinman, Byron A.3,4; Bain, Daniel J.1
	2016-06-01
发表期刊	HOLOCENE
卷号	26 期号:6 页码:906-916
关键词	Human-environmental Interactions Hydrologic Modification Late Holocene Paleoclimate Stable Isotopes Southwestern China
摘要	The human modification of lake hydrology is widespread in the industrial era; however, anthropogenic impacts have occurred for thousands of years in regions of the world with long histories of human occupation. Here, we use geochemical analyses of lake sediment to document the isotopic and geochemical response of Cheng Lake (Chenghai) in southwestern China to catchment modification, including the construction of a downstream dam. The Chenghai record indicates that land-use changes affected the lake/catchment by at least AD 1150 as evidenced by an increased flux of terrestrial organic matter, sediment with high concentrations of sorbed metals, and variations in stable isotopes of oxygen in precipitated aragonite. Decreases in magnetic susceptibility and metal concentrations after AD 1360 indicate a change in sediment basin dynamics. The construction of a downstream dam between AD 1573 and 1620 caused positive shifts in the isotopic composition of aragonite, indicative of increased evaporative loss and a longer water residence time. A lake-level drop by AD 1779 is accompanied by a decrease in organic carbon and a lighter nitrogen isotopic composition that suggests the oxidation of organic matter and/or reduced primary productivity. These changes closely coincide with shifts in climate variability (such as the termination of the Little Ice Age') inferred from other, regional paleoclimate records, highlighting the challenges in distinguishing between natural and anthropogenically driven environmental variations. This study demonstrates the importance of historical and cultural context in the interpretation of lake sediment records with substantial human settlement proximal to the lake system.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/6321
专题	青海盐湖研究所知识仓储盐湖地质与环境实验室
作者单位	1.Univ Pittsburgh, Dept Geol & Environm Sci, Pittsburgh, PA 15260 USA 2.Chinese Acad Sci, Qinghai Inst Salt Lakes, Beijing 100864, Peoples R China 3.Univ Minnesota Duluth, Dept Earth & Environm Sci, Duluth, MN USA 4.Univ Minnesota Duluth, Large Lakes Observ, Duluth, MN USA
推荐引用方式 GB/T 7714	Hillman, Aubrey L.,Abbott, Mark B.,Yu, JunQing,et al. The isotopic response of Lake Chenghai, SW China, to hydrologic modification from human activity[J]. HOLOCENE,2016,26(6):906-916.
APA	Hillman, Aubrey L.,Abbott, Mark B.,Yu, JunQing,Steinman, Byron A.,&Bain, Daniel J..(2016).The isotopic response of Lake Chenghai, SW China, to hydrologic modification from human activity.HOLOCENE,26(6),906-916.
MLA	Hillman, Aubrey L.,et al."The isotopic response of Lake Chenghai, SW China, to hydrologic modification from human activity".HOLOCENE 26.6(2016):906-916.