REY‐Th‐U Solute Dynamics in the Critical Zone: Combined Influence of Chemical Weathering, Atmospheric Deposit Leaching, and Vegetation Cycling (Mule Hole Watershed, South India)
作者： Jean-Jacques Braun , Jean Riotte , Shrema Battacharya , Aurélie Violette , Jonathan Prunier
DOI: 10.1002/2017GC007158
关键词: Plagioclase 、 Weathering 、 Geology 、 Surface runoff 、 Hydrology 、 Precipitation 、 Groundwater 、 Forest floor 、 Authigenic 、 Leaching (agriculture)
摘要: The source and proportion of REY, Th U exported by groundwater the ephemeral stream along with elemental proportions passing through vegetation have been assessed in sub-humid tropical forested CZO Mule Hole, Southern India. study relies on a pluri-annual hydro-geochemical monitoring combined hydrological model. significant difference between soil input (SI) output (SO) solute fluxes (mmol/km2/yr) LREE (SI-SO = 13250-1500), HREE (1930-235), (64-12) (63-25) indicates strong uptake roots carried canopy forest floor processes. contribution atmospheric dust leaching can reach about 60% 80% HREE. At watershed scale, flux (180 mmol/km2/yr) mainly originates from breakdown primary U-bearing accessory minerals dominates factor 25 flux. precipitation authigenic bearing phases adsorption onto Fe-oxides oxyhydroxides plays role for limiting mobility. In groundwater, plagioclase chemical weathering is efficiently traced positive Eu-anomaly. very low (REY) to nil (Th) contents are explained phases. flow, dominated overland flow (87% yearly flow), exports (in REY (1080 160 HREE) (14) dominate those groundwater. Their mobility enhanced chelation organic ligands produced
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