MINERAL NUTRIENTS IN FLUVIAL SEDIMENTS FROM THE PERUVIAN AMAZON

Citation
R. Kalliola et al., MINERAL NUTRIENTS IN FLUVIAL SEDIMENTS FROM THE PERUVIAN AMAZON, Catena, 20(3), 1993, pp. 333-349
Citations number
48
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary","Water Resources
Journal title
CatenaACNP
ISSN journal
0341-8162
Volume
20
Issue
3
Year of publication
1993
Pages
333 - 349
Database
ISI
SICI code
0341-8162(1993)20:3<333:MNIFSF>2.0.ZU;2-3
Abstract
Mineral nutrient content was determined from fluvial sediments of eigh t different rivers in Peruvian Amazonia. Statistically significant dif ferences between the floodplains were detected in the mean values of s oil reaction, conductivity, concentrations of total phosphorus, calciu m and aluminium, concentrations of extract able sodium, calcium and al uminium, and in the ratios Ca/Mg and Mg/K. Principal components ordina tion based on geochemical variables exhibits a spectrum from rivers de positing sediments rich in extractable bases, to those which deposit s ediments acid in reaction and rich in extractable aluminium. The distr ibution of the sediment types corresponds to the geology of the catchm ent area. Fluvial sediments of suspension-rich rivers of Andean origin are rich in their extractable mineral nutrient content; especially ca lcium is prominent. Differences in the chemical properties of fluvial sediments contribute to the regional heterogeneity of the environment in the lowland Peruvian Amazon and are likely to affect the distributi on of plant species. Since the origin of most of the soils in this reg ion is fluvial, sediment provenance and age should be considered in so il surveys.