Barriers to tree seedling emergence on human ... - Wiley Online Library
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Barriers to tree seedling emergence on human ... - Wiley Online Library
A. M. T. A. Gunaratne1,2*, C. V. S. Gunatilleke2, I. A. U. N. Gunatilleke2,. H. M. S. P. Madawala Weerasinghe2 and D. F. R. P. Burslem1. 1Institute of Biological ...
Journal of Applied Ecology 2010, 47, 157–165
doi: 10.1111/j.1365-2664.2009.01763.x
Barriers to tree seedling emergence on human-induced grasslands in Sri Lanka A. M. T. A. Gunaratne1,2*, C. V. S. Gunatilleke2, I. A. U. N. Gunatilleke2, H. M. S. P. Madawala Weerasinghe2 and D. F. R. P. Burslem1 1
Institute of Biological and Environmental Sciences, University of Aberdeen, Cruickshank Building, St Machar Drive, Aberdeen AB24 3UU, UK; and 2Department of Botany, University of Peradeniya, 20400 Peradeniya, Sri Lanka
Summary 1. Colonization by woody plants is often very slow or absent on grasslands occupying degraded land in the tropics. Seed dispersal limitation is widely reported, but the constraints to forest succession imposed by barriers to seedling establishment are poorly understood. We tested the hypotheses that seedling emergence of woody plants is limited by interactions of anthropogenic fire, vertebrate herbivory and competition with the dominant grass sward in human-induced montane grasslands in Sri Lanka. 2. Seedling emergence was determined fortnightly for 18 months in response to experimental manipulation of fire regimes, access by vertebrate herbivores and competition from the dominant grass canopy at the forest ⁄ grassland edge and at 10, 20 and 40 m from the edge into four blocks of grassland. Seedling emergence was also monitored in the absence of any experimental manipulation at 10, 20 and 40 m into adjacent blocks of lower montane rainforest. 3. Emergence of seedlings of woody plants was much lower in the grassland (mean
