BSC 2011 Lecture Notes - Lecture 9: Rubisco, Photosynthesis
14 Apr 2017
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Document Summary
Net production efficiencies decrease at higher trophic levels. Only 1% of npp ends up as production in the 3rd trophic level. Npp in terrestrial systems is often limited by climatic factors. Npp increases with increasing precipitation to about 2400mm, then decreases at higher levels. If its raining a lot, there is not a lot of sun, less light availability, less photosynthesis. Npp in terrestrial systems may also be limited by nutrients. Npp in aquatic systems in often limited by light and nutrients. There is continual recycling between the organisms an the physical environment. Nutrients unlike energy are retained within the ecosystem. Cycling can be driven by an organisms need for growth, or for energy. 50% of n in leaves tied up in rubisco and other photosynthesis enzymes. Hard to come by because plants can only take up a certain type. Bacteria form mutualistic symbiotic relationship with plant roots. Plants give bacteria carbohydrates and get n in return.
