Weed potential of Mikania micrantha H.B.K., and its control in fallows after shifting agriculture (Jhum) in North-East India |
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| Institution: | 1. Division of Infectious Diseases, Department of Pediatrics and Department of Medical Microbiology, The Montreal Children''s Hospital, McGill University, E05-1954 – 1001 Decarie Blvd, Montreal (QC) H4A 3J1, Canada;2. Department of Pediatrics, Université de Sherbrooke, 3001 12e Avenue Nord, Sherbrooke (QC) J1H 5N4, Canada;3. Division des risques biologiques et de la santé au travail – Institut national de santé publique du Québec, 190 Crémazie Blvd E., Montreal (QC) H2P 1E2, Canada;4. Department of Epidemiology, Biostatistics, and Occupational Health – McGill University, 1020 Pine Avenue W, Montreal (QC) H3A 1A2, Canada;5. MUHC Vaccine Study Centre, 14770 Pierrefonds Blvd, Suite 204, Montreal (QC) H9H 4Y6, Canada;1. Centre for Crop Systems Analysis, Wageningen University, P.O. Box 430, 6700 AK Wageningen, The Netherlands;2. Knowledge, Technology and Innovation Group, Wageningen University, P.O. Box 8130, 6700 EW Wageningen, The Netherlands;3. Coordenação de Tecnologia e Inovação, Instituto Nacional de Pesquisas da Amazônia, Av. André Araújo, 2936, 69067-375, Manaus, Brazil;1. Oceanography Department, Faculty of Science University of Alexandria, Egypt;2. Department of Physics and Astronomy, Alma Mater Studiorum University of Bologna, Bologna, Italy;3. Centro EuroMediterraneo sui Cambiamenti Climatici, Bologna, Italy;4. CMRE, Centre for Maritime Research and Experimentation, La Spezia, Italy;1. Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC 27695, USA;2. Durania LLC, Boone NC 28607 USA;3. Institute for Applied Ecosystem Studies, Northern Research Station, USDA Forest Service, Rhinelander, WI 54501, USA;1. CRA-NUT National Council for Agricultural Research, Research Center for Food and Nutrition, Via Ardetina 546, 00178 Rome, Italy;2. Laboratorio di Strutture e Materiali Intelligenti – Università La Sapienza di Roma sede distaccata di Cisterna di Latina, Palazzo Caetani ala nord Via San Pasquale snc., 04012 Cisterna di Latina, LT, Italy;3. INAIL, Via Alessandria 220/e, 00198 Rome, Italy;4. Western Regional Research Center, Agricultural Research Service, United States Department of Agriculture, Albany, CA 94710, USA |
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| Abstract: | Mikania micrantha H.B.K. is an exotic, perennial weed which colonizes communities developing after slash and burn agriculture (Jhum) at lower elevations of north-east India. The population dynamics and reproductive potential of M. micrantha was studied. Reproduction through ramets arising from rosettes exceeded that from seeds. The ramet population growth was highest during the monsoon season as a consequence of high population birth and large-scale mortality. Net population increased with increasing age of the fallow for 3 years, and declined drastically in 6- and 12-year-old fallows. Biomass was allocated mainly to the ramet root system in younger fallows and to the rosette root system in older fallows. Seed reproduction potential peaked in a 3-year-old fallow and declined rapidly thereafter. The significance of the results in terms of natural elimination of the species through succession, and the increased weed potential leading to arrested succession under short jhum cycles is discussed. |
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