Abstract
Vegetation succession and sedimentation rates are being studied on those parts of the Kvikkjokk delta which are above normal summer low water level. Practically the whole delta is inundated during high floods (recurrence interval 3–4 years), but only 13% of the delta's land area receives sedimentation: during lower floods of annual frequency only 3%. Sedimentation is smoother and less variable during high than during low floods. It shows no correlation with suspended load transport during floods, but varies directly with the mean height of floods. It shows no simple correlations with vegetation, but close study of plant communities together with the study of stratification in the uppermost parts of the soil profile provides accurate information about actual sedimentation rates. Only a few plant communities receive sedimentation regularly, several never do, and special communities characterize, for example, the sinking areas on the delta. The mapping of delta vegetation by aerial photographs may provide clues to morphological activity in inaccessible drainage basins.
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