Biology 2483A Lecture 19: Lecture notes 19 Production
Document Summary
Integrates ecology with other disciplines such as geochemistry, hydrology, and atmospheric science. Ecosystem all the components of an ecological system, biotic and abiotic, that influences the flow of. Primary production chemical energy generated by autotrophs during photosynthesis and. Energy made by autotrophs is stored as carbon compounds in plant tissues, thus carbon chemosynthesis. measures primary production. Gross primary production (gpp) the total amount of carbon fixed by autotrophs. Lead area index (lai) leaf area per unit of ground area. Photosynthetic rate is influenced by lai and climate. Lai varies among biomes (less than 0. 1 in arctic tundra ~10% of ground has leave cover and. 12 lai in boreal and tropical forests, aka 12 layers of leaves between ground/canopy) Due to shading, at some point respiratory costs of many leaf layers outweighs photosynthetic benefit. Plants use ~half of the carbon fixed in photosynthesis for cellular respiration. All plant tissues lose carbon via respiration, but not all tissues are photosynthetic (tree trunks)
