Niveau: Supérieur, Doctorat, Bac+8
tation influence the nematode community following abandonment of a field, it is necessary to first assess the impact of environmental factors such as soil or climate on these organisms. The study Agriculture, Ecosystems and Environment 108 (2005) 302–317 * Corresponding author. Tel.: +27 31 539 32 05; fax: +27 31 539 54 06. E-mail address: (P. Cadet). 0167-8809/$ – see front matter _ 2005 Elsevier B.V. All rights reserved. doi:10.1016/j.agee.2005.01.008 and 10 fallow sites ranging from 1 to 18 years old. Soil samples were collected over 3 years on 17 occasions, along 21 m fixed transects, located in representative vegetation zones. Plant-parasitic nematodes were extracted, identified and enumerated from soil samples. The statistical analysis showed that the sites could be split in three groups according to the plant-parasitic nematode communities. One group, corresponding to young fallows, was characterised by large populations of Scutellonema cavenessi and Tylenchorhynchus gladiolatus. A second group included most of the older fallows and was characterised by a more diversified nematode community dominated by Helicotylenchus dihystera. The forest hosted a particular community partly similar to both of the other groups. Soil physical and chemical analysis split the sites into two groups, the young fallow sites plus the forest, and the older sites.
- analysis showed
- plant
- natural fallow
- abundance
- host plants
- tylenchorhynchus mashhoodi
- covariance between
- abundance relative
- affect soil