التفاصيل البيبلوغرافية
| العنوان: |
SIMULATION OF HEATHLAND VEGETATION DYNAMICS. |
| المؤلفون: |
Prentice, I.C., van Tongeren, O., de Smidt, J.T. |
| المصدر: |
Journal of Ecology; Mar87, Vol. 75 Issue 1, p203, 17p |
| مصطلحات موضوعية: |
HEATHLAND ecology, VEGETATION dynamics |
| مستخلص: |
(1) A computer model was used to simulate changes in heathland composition after fire. The model is based on simple stochastic representations of establishment, growth mortality and competition for space. (2) Model parameters—establishment rates maximum diameters and heights and growth constants—were estimated for Calluna vulgaris, Empetrum nigrum and Erica tetralix on a heathland in the Netherlands where these three species are co-dominant. (3) The resulting simulations were compared with cover data for 19 years from a mapped 12 m × 20 m permanent quadrat. Apart from the temporary effects of a drought the cover percentages lay almost entirely within a 90% probability envelope obtained from the replicate simulations. Trends with time in transition frequencies among species were also correctly predicted. (4) Factorial sensitivity experiments simulated responses of the mature community to changes in the growth constants and establishment rates of these species. These experiments also revealed differences in the strategies of the species, compensatory and synergistic effects, and an instance of competitive mutualism—illustrating the complex community behaviour that can emerge from a relatively simple model. (5) The mature community is not at an uneven-aged equilibrium and, in the long-term, natural disturbances, climatic variation and rational management may prevent this. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
