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|Título:||The soil seed bank in abandoned tropical pastures: source of regeneration or invasion?|
|Palabras clave:||Biología; Botánica; Conservación|
Cecropia; tropical rain forest; Selva Lacandona; Chiapas; pioneer regeneration; weed invasion
|Fecha de publicación:||23-Sep-2011|
|Editorial:||Instituto de Biología|
|Descripción:||We assessed the availability of both pioneer and non-native species in the soil seed bank of old-growthforest and recently abandoned pasture, to evaluate whether the soil seed bank in these pastures represents a source ofregeneration of species from adjacent old-growth forest or of invasion by non-native species. Our study was conductedat Selva Lacandona, Chiapas, Mexico. Soil samples were randomly collected from 6 sites in old-growth forest, and 6sites in abandoned pastures. Seedlings from soil samples were identified and classified into pioneer, non-native (weeds/graminoids), and other forest species. Pioneer species seeds were virtually absent in pastures, but represented ~30%of seeds in the forest. Non-native species comprised ~99% of the soil seed bank in pastures. In the forest, soil seedbank density of weeds and graminoids decreased with increasing distance (up to 4 km) from agricultural fields, andcomprised up to 25% (Mean ± 1SE= 16 ± 7) of the seed bank. Our results show a near total elimination of pioneerspecies from the soil seed bank in pastures, and considerable invasion of the borders of the Montes Azules reserve byseeds of non-native species. Thus, in the region studied, the soil seed bank in abandoned pastures represents a source ofinvasion by non-native species into old-growth forest rather than a potential source of forest regeneration.|
|Aparece en las Colecciones:||Revista Mexicana de Biodiversidad|
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