Humus Index as an indicator of forest stand and soil properties |
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| Institution: | 1. Muséum National d’Histoire Naturelle, CNRS UMR 5176, 4 avenue du Petit-Château, 91800 Brunoy, France;2. Cemagref, Unité de Recherche “?cosystemes Forestiers”, Domaine des Barres, 45290 Nogent-sur-Vernisson, France;1. Teagasc, Johnstown Castle Research Centre, Ireland;2. Netherlands Institute of Ecology, The Netherlands;3. Wageningen University and Research Centre, The Netherlands;4. Leeds University, UK;5. National Institute for Public Health and the Environment, The Netherlands;6. ECT Oekotoxikologie GmbH, Germany;7. University of Amsterdam, The Netherlands;8. Aarhus University, Denmark;9. University College Dublin, Ireland;10. INRA, UMR 1347 Agroécologie, Dijon, France;11. INRA, Laboratory of Excellence Advanced Research on the Biology of Tree and Forest Ecosystems (ARBRE), UMR 1136, Champenoux, France University of Lorraine, UMR 1136, Champenoux, France;12. Centre for Functional Ecology, University of Coimbra, Portugal;13. CEMUC and Department of Life Sciences, University of Coimbra, Portugal;14. Crop and Soils Systems Research Group, SRUC, UK;15. Centre for Ecology and Hydrology, UK;p. Université de Bourgogne, UMR1347 Agroécologie, Dijon, France;1. UN Environment World Conservation Monitoring Centre (UNEP-WCMC), 219 Huntingdon Road, Cambridge CB3 0DL, UK;2. Institute of Zoology, Zoological Society of London, Regent’s Park, London NW1 4RY, UK;3. School of Anthropology and Conservation, University of Kent, Canterbury CT2 7NR, UK;4. Nick Davidson Environmental, Queens House, Ford Street, Wigmore HR6 9UN, UK;5. Institute for Land, Water and Society, Charles Sturt University, Elizabeth Mitchell Drive, PO Box 789, Albury, NSW 2640, Australia;6. Stetson University College of Law, 1401 61st Street South, Gulfport, FL 33707, USA;7. Fauna and Flora International (FFI), The David Attenborough Building, Pembroke St, Cambridge CB2 3QZ, UK;8. Department of Anthropology, University College London, 14 Taviton St, London WC1H 0BW, UK;1. Carbon Management and Sequestration Center, School of Environment and Natural Resources, The Ohio State University, 2021Coffey Road, 414A Kottman Hall, Columbus, OH 43210-1085, USA;2. Department of Geography and Planning, State University of New York, Albany, NY, USA |
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| Abstract: | The Humus Index, based on the visual assessment of topsoil horizons and a classification of humus forms, is a numerical score which can be used as a correlate of stand and soil properties. In oak stands from the Montargis forest (Loiret, France) we observed a good linear relationship of the Humus Index with most parameters describing stand development (age, basal area (BA), height and diameter at breast height of dominants) and soil type (depth of clay horizon). The relationship with parameters describing nutrient availability (exchangeable bases, base saturation) was similarly good but nonlinear. In the studied forest the Humus Index was affected first by stand age and second by soil type. When corrected for age and soil type, data (96 pooled estimates) indicated a slight decrease in the Humus Index (shift towards more active humus forms) in stands converted from old coppices-with-standards when compared with even-aged high forest. |
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