Distribution of nematodes in vertisol aggregates under a permanent pasture in Martinique
| Autor: | Jean-Luc Chotte, Patrick Quénéhervé |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
ECOLOGIE DES PARASITES
Rhizosphere geography geography.geographical_feature_category Ecology biology Digitaria PEDOLOGIE Bulk soil Soil Science Vertisol NEMATODE AGREGAT Silt biology.organism_classification Soil type Agricultural and Biological Sciences (miscellaneous) Pasture NEMATOLOGIE VERTISOL Agronomy Martinique |
| Zdroj: | Applied Soil Ecology. 4:193-200 |
| ISSN: | 0929-1393 |
| DOI: | 10.1016/s0929-1393(96)00118-7 |
| Popis: | This study reports on the distribution of nematodes in different soil habitats under a permanent pasture of digitgrass (#Digitaria decumbens$ Stent. cv. "Pangola") in Martinique. The objectives were to evaluate a gentle fractionation method compatible with further soil nematode extraction and to assess the respective soil microhabitats of plant-feeding nematodes and free-living nematodes. This study indicated that the gentle soil fractionation can effectively separate soil habitats and allow the recovery of associated nematodes. Plant-feeding nematodes were equally distributed between inter-aggregate pores, habitats constituted of aggregated fine silt + clay particles and roots + rhizosphere. Most of free-living nematodes (53%) resided in the inter-aggregate pores. Irrespective of food resource, densities of nematodes (number per gram of habitat) were similar in habitats coarser than 1000 micrometres (A5000, A2000 and A1000). Habitats with the finest soil (A200) were not favourable sites because of the rarity of roots (for plant-feeding nematodes) and physical constraints. (Résumé d'auteur) |
| Databáze: | OpenAIRE |
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