Interaction between light and drought affect performance of Asian tropical tree species that have differing topographic affinities |
| |
| Institution: | 1. School of Forestry & Environmental Studies, Yale University, 360 Prospect Street, New Haven, CT 06511-2189, USA;2. Department of Forestry & Environmental Science, University of Sri Jayewardenepura, Sri Lanka;1. Ecological Security and Protection Key Laboratory of Sichuan Province, Mianyang Normal University, Mianyang 621000, China;2. College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China;3. Department of Agricultural Sciences, Viikki Plant Science Centre, University of Helsinki, P.O. Box 27, FI-00014, Finland;4. Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, 51006 Tartu, Estonia;5. Estonian Academy of Sciences, Kohtu 6, 10130 Tallinn, Estonia;1. Joint Research Unit CTFC – AGROTECNIO, Ctra de St. Llorenç de Morunys, km 2, 25280 Solsona, Catalonia, Spain;2. Biosciences Department, UVic-UCC. C/ de la Laura, 13, 08500 Vic, Catalonia, Spain;1. Department of Botany, Institute of Biology, Siedlce University of Natural Science and Humanities, 08-110 Siedlce, Poland;2. Department of Ecology and Environmental Protection, Institute of Biology, Siedlce University of Natural Science and Humanities, 08-110 Siedlce, Poland;1. Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, Nanjing Agricultural University, Jiangsu 210095, China;2. Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, Ottawa, ON, Canada K1A 0C6;1. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;2. Jiangxi Provincial Key Laboratory for Restoration of Degraded Ecosystems & Watershed Ecohydrology, Nanchang Institute of Technology, Nanchang 330099, China;3. School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036, China;4. The New Zealand Institute for Plant and Food Research Limited, Hawke’s Bay, New Zealand;5. Collaborative Innovation Centre of Jiangxi Typical Trees Cultivation and Utilization, College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China;6. Hawkesbury Institute for the Environment, Hawkesbury Campus, Western Sydney University, Locked Bag 1797, Penrith NSW2751, Australia;1. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment, Ministry of Agriculture and Rural Affairs, Beijing 100081, China;2. College of Agriculture, Yangtze University, Jingzhou 434025, China;3. South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;4. College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China;5. Jingzhou Agro-meteorological Experimental Station, Jingzhou Meteorological Bureau, Jingzhou, 434025, China |
| |
| Abstract: | We studied two pairs of congeneric species (Dipterocarpus hispidus, Dipterocarpus zeylanicus, Mesua ferrea, and Mesua nagassarium). These species are canopy trees of rain forest in south-west Sri Lanka that exhibit differing topographic affinities. We hypothesized that topographic affinity is related to successional status and species ability to endure drought. We tested for these changes by measuring morphology of seedlings growing with each other in differing combinations of light and water. We constructed shade houses with a range of photosynthetic photon flux densities (PFD) and red:far red (R:FR) ratios. Two watering regimes within shade treatments created soil conditions that were either evermoist or periodically dry. Seedlings of the four species were inter-planted at equal spacing within large flats. They were allowed to grow amongst each other for a 2-year period. The more shade-intolerant Dipterocarpus spp. exhibited greater morphological responsiveness to increases in irradiance than the more shade-tolerant Mesua spp. We also demonstrate that all four species differ substantially from each other when morphological attributes (height, dry mass, leaf area) are compared together. Differences among these four species can be logically explained by their sequential competitive exclusion in relation to increasingly limited resources of light and soil water. In high light and evermoist soil conditions D. zeylanicus performs best. Under deep shade Mesua spp. have greater height than Dipterocarpus spp. When soil water is limiting, and the level of shade intermittent, M. nagassarium has greater height than the other three species. These results conform to species observed topographic distribution in the forest. Further studies are needed of wild populations growing across a range of forest sites to confirm whether these four species differ when grown under natural field conditions. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
