Where does the majority of biomass in a tree come from?
a. water in the soil
b. nutrients in the soil
c. orgainic carbon in the soil
d. CO2 in the atmosphere
e. solar radiation
Where does the majority of biomass in a tree come from?
a. water in the soil
b. nutrients in the soil
c. orgainic carbon in the soil
d. CO2 in the atmosphere
e. solar radiation
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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?
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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
Please explain your answers if you can. Thank you!
What is the main reason so many species are currently under threat of extinction?
A. extinctions are cyclic, and we are in a peak now | |||||||||||||||||||||
B. habitat destruction and transformation | |||||||||||||||||||||
C. lack of appropriate ecosystem services | |||||||||||||||||||||
D. overhunting and overfishing by humans In sustainable farming practices involving crop rotation, should the land be covered at all times with plant material?
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