NITRATE REMOVAL BY DENITRIFICATION IN ALLUVIAL GROUND-WATER - ROLE OF A FORMER CHANNEL

被引：64

作者：

FUSTEC, E ^{[1
]}

MARIOTTI, A ^{[1
]}

GRILLO, X ^{[1
]}

SAJUS, J ^{[1
]}

机构：

[1] CNRS, CTR ECOL RESSOURCES RENOUVELABLES, F-31055 TOULOUSE, FRANCE

来源：

JOURNAL OF HYDROLOGY | 1991年 / 123卷 / 3-4期

关键词：

D O I：

10.1016/0022-1694(91)90098-3

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Chemical variations of ground water in an ancient meander of the Garonne river (southern France) were compared with that of ground water located under the intensively cultivated fields of the surrounding alluvial plain. Nitrate, Mn[II] and Fe [II] concentrations were found to be very different in the two situations. The denitrification process in the former channel was identified through the natural N-15 isotope enrichment on residual nitrate induced by isotope fractionation and by the in situ measurement of gaseous nitrogen losses using the acetylene method. A recent embankment leads to the progressive drying of the waterlogged soils thereby decreasing the capacity of this natural riparian wetland to regulate nitrate transfers from the agricultural plain to the river.

引用

页码：337 / 354

页数：18

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