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प्रश्न
Justify the following statement in terms of ecosystem dynamics. “Nature tends to increase the gross primary productivity, while man tends to increase the net primary productivity”.
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उत्तर
Rate of production of organic matter in an ecosystem is called Gross Primary Productivity (GPP). When we subtract the respiratory losses (R) from GPP, we get Net Primary Productivity (NPP).
Nature provides various biotic and abiotic factors to enhance the rate of Gross Primary Productivity. Hence, it can be said that nature tends to increase the gross primary productivity.
But human beings need to make optimum utilization of the biomass produced. This is achieved in various ways; like harvesting the crop at the right time and plucking the fruits at the right time. If fruits will be left on the tree for a longer time, it will result in higher respiratory losses. A higher respiratory loss will reduce NPP. By plucking the fruits at the right time, man tries to increase the net primary productivity.
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संबंधित प्रश्न
What is primary productivity?
Write the equation that helps in deriving the net primary productivity of an ecosystem.
How are productivity, gross productivity, net primary productivity and secondary productivity interrelated ?
Distinguish between primary and secondary productivity.
What is the primary productivity of an ecosystem and how is it expressed?
Explain what does the equation given below show:
NPP = GPP – R
Secondary productivity is rote of formation of new organic matter by ______.
Which one of the following ecosystem is most productive in term of net primary production?
How much of the net primary productively of a terrestrial ecosystem is eaten and digested by herbivores?
If A = Gross primary productivity, B = Net primary productivity and C = Respiration losses, then what will be the correct relation between them?
Productivity is the rate of production of biomass expressed in terms of ______.
Why are oceans least productive?
Primary productivity varies from ecosystem to ecosystem. Explain?
Which of the following ecosystems will be more productive in terms of primary productivity? Justify your answer. A young forest, a natural old forest, a shallow polluted lake, alpine meadow.
Which of the following is the unit of productivity of an Ecosystem?
In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100x(kcal m−2) yr−1, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?
