Chemical fingerprints of hydrological compartments and flow paths at La Cuenca, western Amazonia

被引：56

作者：

Elsenbeer, H ^{[1
]}

Lack, A ^{[1
]}

Cassel, K ^{[1
]}

机构：

[1] N CAROLINA STATE UNIV, DEPT SOIL SCI, RALEIGH, NC 27695 USA

来源：

WATER RESOURCES RESEARCH | 1995年 / 31卷 / 12期

关键词：

D O I：

10.1029/95WR02537

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A forested first-order catchment in western Amazonia was monitored for 2 years to determine the chemical fingerprints of precipitation, throughfall, overland flow, pipe flow, soil water, groundwater, and streamflow. We used five tracers (hydrogen, calcium, magnesium, potassium, and silica) to distinguish ''fast'' flow paths mainly influenced by the biological subsystem from ''slow'' flow paths in the geochemical subsystem. The former comprise throughfall, overland flow, and pipe flow and are characterized by a high potassium/silica ratio; the latter are represented by soil water and groundwater, which have a low potassium/silica ratio. Soil water and groundwater differ with respect to calcium and magnesium. The groundwater-controlled streamflow chemistry is strongly modified by contributions from fast flow paths during precipitation events. The high potassium/silica ratio of these flow paths suggests that the storm flow response at La Cuenca is dominated by event water.

引用

页码：3051 / 3058

页数：8

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