A grassland has a gross primary productivity of 2800 g of dry matter in each square metre in a year…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A grassland has a gross primary productivity of of dry matter in each square metre in a year. The grasses use of it in respiration.
- What is the net primary productivity, in g for each square metre in a year?
- What per cent of the GPP do the grasses use in respiration? Give the answer to one decimal.
Need a reminder? The key ideaShow
, where is the respiration of the plants. Productivity is a rate, in or . The NPP is the biomass available to the herbivores and the decomposers. One kilocalorie is .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. GPP , , for each square metre in a year.
Plan. Use . Then divide by the GPP.
Step 1. (a) for each square metre in a year.
Step 2. (b) .
Answer: ; .
Check. The NPP and the respiration add up to the GPP: .
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