Question

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?

a) temperate deciduous forest

b)desert

c) rain forest

d) coniferous (boreal) forest

e) arctic tundra

Which of the following is a result found by Dr. Schuur in this study?

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Which of the following is a result found by Dr. Schuur in this study?

a. Low soil oxygen levels leads to an increase in the rates of decomposition and mineralization.

b. Litter quality has no effect on decomposition.

c. Lower soil nitrogen leads to higher nitrogen concentration in leaves.

d. High precipitation leads to low soil oxygen levels.

e. Increased nitrogen availability is responsible for the decline in net primary productivity across the rainfall gradient within his study area.

Why does soil oxygen concentration have a direct relationship to decomposition rates?

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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