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- Title
Colonization of grassland by sown species: dispersal versus microsite limitation in responses to management.
- Authors
Coulson, Sarah J.; Bullock, James M.; Stevenson, Mark J.; Pywell, Richard F.
- Abstract
1. Diversification of species-poor grassland often requires the introduction of desirable species by sowing seed. Little is known about the factors controlling the spread of introduced species, or how these interact with management. We determined whether management affected spread rates of two grassland species by modifying seed dispersal or seedling establishment. 2. An experiment was set up in 1995 on a species-poor grassland. It comprised five blocks, each with four treatments: (1) autumn grazed only; (2) cut July; (3) cut July and September; (4) cut July and aftermath grazed. Twenty-two plant species were separately slot-seeded into each treatment plot, providing discrete linear colonization foci. 3. The mechanisms controlling spread were studied in two species: Rhinanthus minor, an annual with large seeds adapted for wind dispersal; and Leucanthemum vulgate, a perennial with small seeds with no obvious dispersal adaptations. 4. Perpendicular spread of each species by 1998 was described well by a simple inverse power model. Rhinanthus had spread further in the hay-cut treatments (2-4) than in the grazed treatment (1). Leucanthemum spread poorly in all plots, with no treatment effects. 5. Seed dispersal from source slots was also described well by the inverse power model. Dispersal curves for Rhinanthus were much longer in the hay-cut treatment (3) than in the grazed treatment (1), because more seed dispersed during hay cutting than before, and cutting dispersed seed longer distances. There was no dispersal by grazing animals. Dispersal showed directional effects: seeds travelled further in the prevailing wind direction before the hay-cut and in the grazed treatment; dispersal by hay cutting was further in the cut direction than in the opposite direction. 6. Leucanthemum showed poor dispersal, with no treatment effects, except that more seeds were dispersed in the grazed (1) than the hay-cut (3) treatment. 7. The establishment and survival of sown seeds...
- Subjects
BIODIVERSITY; ECOLOGY; GRASSLANDS; LEUCANTHEMUM vulgare; GRASSLAND restoration; PLANT propagation
- Publication
Journal of Applied Ecology, 2001, Vol 38, Issue 1, p204
- ISSN
0021-8901
- Publication type
Article
- DOI
10.1046/j.1365-2664.2001.00585.x