Net primary production closely equals: a. ecosystem respiration b. gross primary
ID: 40329 • Letter: N
Question
Net primary production closely equals:
a. ecosystem respiration
b. gross primary production
c. net secondary production
d. photosynthesis minus producer respiration
The tolerance model of succession differs from the facilitation and inhibition models in that:
a. early successional species have little effect on later ones
b. species have little effect on each other
c. later successional species outcompete early successional ones
d. early successional species outcompete later successional ones
1. What limits primary productivity?
2. What drives succession?
Explanation / Answer
net primary production closely equals to photosynthesis minus producer respiration. gross primary production is the amount of chemical energy as biomass in a given length of time, some fraction of the fixed energy is used by primary producers for cellular respiration . the remaining fixed energy is reffered as net primary production , is the rate at which all plants in an ecosystem produce net useful chemical energy.
c
the tolerance model of succession differs from facilitation and inhibition models in that species are relatively successful early in succession when site condition are characterized by free availabilty of resources . these species are eliminated later by because they are not as competitive as later species.
limitations of primary productivity: lack f nutrients, adverse weather conditions, intensity of sunlight , availability of water, intense grazing by herbivores.
causes of succession : the development of the community by the action of vegetation on the environment leads to establishment of new species is called succession. 1. biotic factors as well as climatic , include erosion, wind, fire biotics- various activities of organism .
2. migration, competition
3. climate of area which result in stabilisation of community.