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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
文章类型Article
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.
关键词Human-environmental Interactions Hydrologic Modification Late Holocene Paleoclimate Stable Isotopes Southwestern China
WOS标题词Science & Technology ; Physical Sciences
关键词[WOS]SEDIMENTARY ORGANIC-MATTER ; CLOSED-BASIN LAKES ; YUNNAN PROVINCE ; ENVIRONMENTAL-CHANGE ; HIGH-RESOLUTION ; ASIAN MONSOON ; CLIMATE ; CARBON ; HOLOCENE ; EUTROPHICATION
收录类别SCI
语种英语
WOS研究方向Physical Geography ; Geology
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号WOS:000376305700006
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
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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.
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