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A past exam from a university course in rangeland plant ecophysiology, fall 2005. It includes various questions related to plant ecophysiology, rangeland management, and ecosystem productivity. Topics covered include root mass ratio, oligotrophic habitats, allelopathy, resource competition, amensalism, ecosystem, grazing morphotype, denitrification, allocation, plant functional type, soil nutrient availability, epiphytic bromeliads, regrowth potential, grazing optimization hypothesis, compensatory photosynthesis, grazing avoidance mechanisms, plant growth in nutrient poor habitats, plant biodiversity and ecosystem productivity, net ecosystem production, rangeland management and climate, atmospheric co2 impacts on grassland ecosystems, and functional equilibrium.
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Rangeland Plant Ecophysiology Name: EXAM 3, REWM 3500, Fall 2005 1) Define the following [2 points each]: root mass ratio oligotrophic habitat allelopathy resource competition amensalism ecosystem grazing morphotype denitrification allocation plant functional type
2) List three broad environmental factors commonly correlated with soil nutrient availability. [6 points] 3) Describe two unique adaptations of epiphytic bromeliads enhancing their nutrient acquisition. [6 points] 4) It was thought for many years that the amount of reserve carbon (stored carbohydrates) in grasses was a good predictor of regrowth potential after defoliation. Provide an argument contrary to this notion. Briefly describe evidence supporting your argument. [8 points] 5) Explain the “grazing optimization hypothesis” and provide two examples from lecture used to support this hypothesis. [8 points]
10) Complete the following expression: [2 points] Net Ecosystem Production = Gross Ecosystem Production minus __________________ 11) Explain very briefly how management of rangelands could affect regional climate. [8 points] 12) Rising levels of atmospheric CO2 are likely to have direct and indirect impacts on grassland ecosystems. First, what direct effects on stomatal conductance are anticipated in grasses? Second, what indirect effects are anticipated from these stomatal conductance changes? [8 points]
13) In your opinion, what was the single most important concept (not covered on today’s exam) introduced this semester in REWM 3500? Why did you choose this concept? What is the direct application of this concept to management of rangeland, forest, or wildlife resources? [8 points] BONUS: Define “functional equilibrium.” [2 points]
