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Work package no 8: Population
and plant biological studies
The studies aim at assessing the effects of changes in resource availability
(light, nutrients, CO2, water) and mechanical impacts (grazing,
mowing) on the form and functioning of plant species and their populations. The
methods to be applied are from the field of ecophysiology and population
biology. The following parameters will be investigated for dominant species as
well as species that are found to play a central role in the dynamics of
canopies after changes in land-use:
- Horizontal structure of populations of key-stone species with different
morphological and phenological strategies, population densities and abundance.
- Dynamics of plant architecture and leaf gas exchange in connection with
light availability in the relevant canopy layers.
- Biomass and nutrient allocation to plant organs.
- Carbon and nitrogen isotope (15N) analyses are intended to
determine nitrogen sources and nitrogen allocation of the plant species.
- Phenological observations of vegetative and generative plant development.
- Experimental Testing: The response in growth, allocation and survivorship
of keystone species to different regimes of resources (nutrients, light)
availability and disturbance will be tested experimentally. Adaptational
strategies and threshold levels of species extinction will be determined.
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