气候变化领域集成服务门户(CCPortal): Pastoralism increased vulnerability of a subalpine catchment to flood hazard through changing soil properties

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DOI	10.1016/j.palaeo.2019.109462
	Pastoralism increased vulnerability of a subalpine catchment to flood hazard through changing soil properties
	Bajard M.; Poulenard J.; Sabatier P.; Bertrand Y.; Crouzet C.; Ficetola G.F.; Blanchet C.; Messager E.; Giguet-Covex C.; Gielly L.; Rioux D.; Chen W.; Malet E.; Develle A.-L.; Arnaud F.
发表日期	2020
ISSN	0031-0182
卷号	538
英文摘要	Soil erosion is strongly linked to both precipitation patterns and land-use. We examine the effects of erosion and its drivers (i.e. human or/and climate) on soil evolution from the study of lacustrine archives in the northern French Alps. Multi-proxy analyses of the Lake Gers sediment sequence combined with the study of soils and rocks of its catchment allowed to reconstruct its evolution over the past 4.6 kyr. This included 14C dating, short-lived radionuclides, geochemistry, loss on ignition, grain-size analyses, as well as plant and mammal DNA analyses. A total of 127 instantaneous deposits were identified among the continuous sedimentation in the lake and 93 were interpreted as flood deposits. Erosion was quantified for the whole catchment considering both the continuous sedimentation and the flood deposit thicknesses. The catchment is mainly formed by andesitic sandstones over which Andosols and Podzols can develop. However, low weathered materials from colluviation constitute the main input to the lake. Four main phases of changes in soil weathering were recorded by increases in K2O/TiO2 ratios, associated with an increase in both erosion and flood-frequency. Two phases were associated with climate cooling in the Western Alps, from 2.65 to 2.5 and from 1.45 to 1.3 cal kyr BP. The two others (1.9–1.75 and 0.9–0.4 cal kyr BP) were triggered with deforestation, with cow grazing during the Roman period, and with grazing of cows, sheep and goats during the Medieval period, amplified by the onset of the Little Ice Age. The increase in erosion and flood frequency after 950 cal yr BP indicates substantial damages to soils of the catchment including increase of their erodibility over the last millennia. © 2019 The Authors
英文关键词	Climate; Erodibility; Lake sediments; Pastoralism; Pedogenesis; Weathering
语种	英语
scopus关键词	andesite; Andosol; climate variation; cooling; flood deposit; lacustrine deposit; pastoralism; pedogenesis; Podzol; precipitation (climatology); proxy climate record; radionuclide; reconstruction; sedimentation; soil erosion; vulnerability; weathering; Alps; Western Alps; Capra hircus; Mammalia; Ovis aries
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150669
作者单位	Centre for Earth Evolution and Dynamics, University of Oslo, PO Box 1028, Blindern, Oslo, 0315, Norway; Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, EDYTEM, Chambéry, 73000, France; ISTerre, Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, Chambéry, 73000, France; LECA, CNRS UMR 5553, Université Grenoble Alpes, Grenoble, 38041, France; Department of Environmental Science and Policy, Università degli Studi di Milano, Milan, 20133, Italy
推荐引用方式 GB/T 7714	Bajard M.,Poulenard J.,Sabatier P.,et al. Pastoralism increased vulnerability of a subalpine catchment to flood hazard through changing soil properties[J],2020,538.
APA	Bajard M..,Poulenard J..,Sabatier P..,Bertrand Y..,Crouzet C..,...&Arnaud F..(2020).Pastoralism increased vulnerability of a subalpine catchment to flood hazard through changing soil properties.Palaeogeography, Palaeoclimatology, Palaeoecology,538.
MLA	Bajard M.,et al."Pastoralism increased vulnerability of a subalpine catchment to flood hazard through changing soil properties".Palaeogeography, Palaeoclimatology, Palaeoecology 538(2020).