BIOL 1070 Lecture Notes - Radiant Energy, Permafrost, Photosynthesis
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Which of the following are usually density dependent factors (choose any/all that apply):
disease |
food availability |
extreme drought |
reproductive success |
volcanic eruptions |
predation |
light availability (to plants) |
physical space |
THIS IS PART A OF A QUESTION WITH ITS SUBPARTS
What approach could be used to determine if nitrogen availability in the soil directly limits the nutrient concentration of Metrosideros polymorpha leaves?
a)draining water from experimental plots where M. polymorpha is present | ||||||||||
b) adding a known quantity of nitrogen to several experimental plots where M. polymorpha is present | ||||||||||
c) removing leaf litter from a non-forested experimental plot and placing it into another where M. polymorpha is present | ||||||||||
d) removing leaf litter from several experimental plots where M. polymorpha is present | ||||||||||
e) Nutrient concentration in leaves cannot be accurately measured. Decomposition would be highest in which of the following ecosystems?
Which of the following is a result found by Dr. Schuur in this study? View Available Hint(s) Which of the following is a result found by Dr. Schuur in this study?
|
Why does soil oxygen concentration have a direct relationship to decomposition rates?
View Available Hint(s)
Why does soil oxygen concentration have a direct relationship to decomposition rates?
a. Soil oxygen reduces the presence of soil fungi (e.g., mycorrhizae). |
b. Soil oxygen influences the concentration of carbon dioxide available to leaves. |
c. Soil oxygen affects the uptake of nutrients by plant roots. |
d. Soil oxygen allows microbes to break down carbon molecules. |
e. Soil oxygen affects the uptake of water by plant roots. |
The limiting factor on net primary productivity (NPP) in species-rich, lowland ecosystems is __________.
a. carbon
b. nitrogen
c. phosphorus
d. precipitation
e. soil oxygen