Changes in the composition of humus profiles near the trunk base of an oak tree (Quercus petraea (Mattus.) Liebl.) |
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| Affiliation: | 1. UK Centre for Ecology & Hydrology, Lancaster Environment Centre, Lancaster LA1 4AP, UK;2. Lancaster Environment Centre, Pentland Centre for Sustainability in Business, Lancaster University, Lancaster LA1 4YX, UK;1. School of Mining and Metallurgical Engineering, National Technical University of Athens, 15780, Greece;2. School of Civil Engineering, National Technical University of Athens, 15780, Greece;3. Department of Civil and Environmental Engineering, University of Connecticut, Storrs CT 06269 USA;1. Department of Environmental Science and Engineering, Southwest Forestry University, Bailongshi, Kunming 650224, PR China;2. College of Biology and the Environment, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, PR China;3. Joint Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, PR China |
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| Abstract: | Humus profiles were sampled under the crown of a mature oak tree in a coppice with standards (Senart forest, 30 km south of Paris). The sampling design compared the composition of humus profiles at three distances of the trunk base (40, 140 and 240 cm) and in the four cardinal directions. An increase in the development of the OF layer (strongly decayed litter and faeces of epigeic fauna) was observed at 40 cm from the trunk base, paralleling an increase in soil titratable acidity. Since no significant change in litter composition occurred with distance to the trunk base and in the absence of stemflow reaching the ground during showers, diffusion of bark tannins from buried parts of the trunk and main lateral roots were suspected to negatively influence soil biological activity, particularly earthworm activity. |
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