Fluvial dynamics and succession in the lower Ucayali river basin, peruvian Amazonia
Extended areas of the valleys of Amazonian white-water rivers are flooded every year. In the fluvial meandering system of the Ucayali River valley, a succession takes place on the convex banks (point bars). On the episodically flooded ridges ("restingas"), graminacan, shrubby and arborescent pioneer stages develop. In the swales ("bajeales"), flooded every year, a graminacan stage proceeds two shrubby pioneer stages. Relations between textural features of the soil and vegetation development appear only at the beginning of the succession. From the commonest species distribution according to the flooding time, four perturbation degrees are distinguished; occasional flooding; annual short flooding; annual long flooding; and annual submersion of the vegetation by the flood. Moraceae assume a great importance as pioneer species. The sensitivity of the vegetation to the flood time is pointed out.
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| Format: | biblioteca |
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1990
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| Subjects: | HUMEDALES, DINAMICA DE LA POBLACION, SUCESION ECOLOGICA, ESTRUCTURA DEL BOSQUE, BOSQUE TROPICAL HUMEDO, PERU, AMAZONIA, |
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| Summary: | Extended areas of the valleys of Amazonian white-water rivers are flooded every year. In the fluvial meandering system of the Ucayali River valley, a succession takes place on the convex banks (point bars). On the episodically flooded ridges ("restingas"), graminacan, shrubby and arborescent pioneer stages develop. In the swales ("bajeales"), flooded every year, a graminacan stage proceeds two shrubby pioneer stages. Relations between textural features of the soil and vegetation development appear only at the beginning of the succession. From the commonest species distribution according to the flooding time, four perturbation degrees are distinguished; occasional flooding; annual short flooding; annual long flooding; and annual submersion of the vegetation by the flood. Moraceae assume a great importance as pioneer species. The sensitivity of the vegetation to the flood time is pointed out. |
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