BIOL-2356EL Lecture Notes - Lecture 9: Primary Production, Abiotic Component, Phototroph
4 Mar 2020
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Document Summary
Flux of energy - energy flows through ecosystems, ends up as heat (ir radiation) Primary productivity : the rate at which solar energy is stored by photosynthetic activity; unit dry mass. Gross primary productivity : total rate of photosynthesis (& chemosynthesis) Net primary productivity : gross production less respiration by the plants. Varies across globe depending on temperature & precipitation (high temp & precipitation = higher consumers. productivity) ex. Southern tip of india shows effect of precipitation on net productivity. Can be limited by diff factors in aquatic & terrestrial ecosystems. Chemotrophy - globally less important part of primary production than phototrophy, but can be locally important (ex. , acid mine drainage, deep ocean hydrothermal vents, hot volcanic springs) Ecosystem productivity has a close relationship w/ actual evapotranspiration (quantity of water removed from surface due to evaporation & transpiration) Nutrient variation not visible in this pattern due to nutrient variation scale being much smaller.
