Back to AI Flashcard MakerBiology /LGS A-Level OCR Biology - Unit 6 - Ecosystems Part 4
Denitrification
Conversion of soil nitrates to atmospheric nitrogen. Carried out by denitrifying bacteria in anaerobic conditions (e.g. waterlogged soil) who use the nitrates as the final e- acceptor in respiration instead of O2
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Key Terms
Term
Definition
Denitrification
Conversion of soil nitrates to atmospheric nitrogen. Carried out by denitrifying bacteria in anaerobic conditions (e.g. waterlogged soil) who use the ...
Human activities affecting the nitrogen cycle
Use of fertiliser - neutrification, algae use up all the oxygen
Processes removing atmospheric nitrogen
Nitrogen fixation by bacteria; Atmospheric fixation; Haber process
Processes adding to atmospheric nitrogen
Denitrification
Similarities in nitrogen and carbon cycles
Involves plants and animals; Involves anaerobic respiration (decomposers); Both cycles involve atmospheric chemicals
Differences in nitrogen and carbon cycles
Involves sea in cc; No fixation of CO2; Only uses organic processes in cc; N is fixed by bacteria vs on plants
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| Term | Definition |
|---|---|
Denitrification | Conversion of soil nitrates to atmospheric nitrogen. Carried out by denitrifying bacteria in anaerobic conditions (e.g. waterlogged soil) who use the nitrates as the final e- acceptor in respiration instead of O2 |
Human activities affecting the nitrogen cycle | Use of fertiliser - neutrification, algae use up all the oxygen |
Processes removing atmospheric nitrogen | Nitrogen fixation by bacteria; Atmospheric fixation; Haber process |
Processes adding to atmospheric nitrogen | Denitrification |
Similarities in nitrogen and carbon cycles | Involves plants and animals; Involves anaerobic respiration (decomposers); Both cycles involve atmospheric chemicals |
Differences in nitrogen and carbon cycles | Involves sea in cc; No fixation of CO2; Only uses organic processes in cc; N is fixed by bacteria vs on plants |
Use of transects | Look for changes in vegetation across a habitat |
Types of transects | Line | Belt |
Line transect | At reg. intervals | Note of which species are touching the tape |
Belt transect | At reg. intervals; Place a quadrat next to the line (interrupted belt transect) or move the quadrat along the line (continuous); Used to sample succession |
Estimating pop. size | Mean number of a species in a quadrat/ faction of the total habitat area covered by a single quadrat |
Deciding how many samples to take | In a pilot study take random samples looking at species distribution; Plot quadrat number against cumulative frequency; When curve levels off use that number of quadrats |
Units to measure primary productivity on land | gm-2 yr-1 |
Units to measure primaary productivity in water | gm-3 yr-1 |
Decomposes in the nitrogen cycle | Pass urea to next stage |