Soil structure changes induced by the tropical earthworm Pontoscolex corethrurus and organic inputs in a Peruvian ultisol |
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| Affiliation: | 1. Unité sol et agronomie Rennes Quimper (Inra), 65, route de St-Brieuc, 35042 Rennes, France;2. Laboratoire d’écologie des sols tropicaux (IRD), 32, rue H.-Varagnat, 93143 Bondy, France;3. Facultad de Zootecnia, Universidad nacional de la Amazonia, Peruana, Mariscal Caceres # 414, Yurimaguas, Loreto, Peru;1. Department of Earth and Environmental Sciences, KU Leuven, University of Leuven, Celestijnenlaan 200E Box 2411, BE-3001 Leuven, Belgium;2. German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, D-04103 Leipzig, Germany;3. Martin Luther University Halle-Wittenberg, Institute of Biology/Geobotany and Botanical Garden, Am Kirchtor 1, D-06108 Halle (Saale), Germany;4. Department of Geosciences and Natural Resource Management, University of Copenhagen, Rolighedsvej 23, DK-1958 Frederiksberg C, Denmark;5. University Stefan cel Mare of Suceava, Forestry Faculty, 13 Universitatii Street, 720229 Suceava, Romania;6. Natural Resources Institute Finland, Box 68, FI-80101 Joensuu, Finland;7. Białowieża Geobotanical Station, Faculty of Biology, University of Warsaw, Sportowa 19, 17-230 Białowieża, Poland;8. Centre of Evolutionary and Functional Ecology (CEFE UMR 5175, CNRS – University of Montpellier – University Paul-Valéry Montpellier – EPHE), 1919 route de Mende, 34293 Montpellier Cedex 5, France;9. Department of Geobotany, Faculty of Biology, University of Freiburg, Schänzlestraße 1, 79104 Freiburg, Germany;10. Department of Special Botany and Functional Biodiversity, University of Leipzig, 04103 Leipzig, Germany;11. Department of Physics, Earth and Environmental Sciences, University of Siena, Via P. A. Mattioli 4, IT-53100 Siena, Italy;1. University of York, Department of Environment and Geography, Wentworth Way, Heslington, York YO10 5NG, UK;2. National Institute of Agricultural Research of Morocco, Avenue des FAR, B.P. 124 Inezgane - Agadir, Morocco;3. water@leeds, School of Geography, University of Leeds, Leeds LS2 9JT, UK;4. UK Centre for Ecology & Hydrology, Deiniol Road, Bangor LL57 2UW, UK;1. Department of Land Resource Management and Agricultural Technology (LARMAT), College of Agriculture and Veterinary Sciences, University of Nairobi, P. O. Box 29053-00625, Nairobi, Kenya;2. World Agroforestry Centre (ICRAF), United Nations Avenue, P.O. Box 30677-00100, Nairobi, Kenya;3. Soil and Crop Science, Cornell University, Ithaca, NY 14853, USA;4. Atkinson Center for a Sustainable Future, Cornell University, Ithaca, NY 14853, USA;1. College of Ecology and Soil & Water Conservation, Southwest Forestry University, 300 Bailongsi, Kunming 650224, PR China;2. Co-Innovation Center for Sustainable Forestry in Southern China, 159 Longpan Road, Nanjing 210037, PR China |
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| Abstract: | Inoculation of Pontoscolex corethrurus (Glossoscolecidae, Oligochaeta) in a Peruvian ultisol under several treatments (without or with organic input) has been previously shown to increase macroaggregation and bulk density and to decrease water infiltration and soil moisture. In the present study, we used image analysis of thin sections of soil to understand the impact of earthworm on the structure of the upper layer of the soil. Morphological analysis allowed to quantify the abundance of casts, soil compactness, pore morphology and connections between different pore classes. This approach was applied to experiments carried out at Yurimaguas (Peru), in four plots. Two of them had been inoculated with Pontoscolex corethrurus. In each case, one control plot was conducted without organic input, the other with crop residues and legume green manure. Morphological parameters were measured in fourteen horizontal sections within the first 3 cm. They showed compaction of soil surface due to cast coalescence in plots with earthworms but without organic input and illustrated the typical crumb structure induced by earthworms in plots with organic input. |
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