LIFESCI 1 Lecture 19: LS1_19.pdf
21 Jan 2015
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Patterns in ecosystem productivity: what are the patterns of ecosystem productivity around the world, terrestrial npp patterns, npp is higher in the tropics and lower in high latitudes and deserts. Purple (high npp) band around the equator. Low npp in deserts (e. g. sahara: npp increases with temperature. Higher temperature = more photosynthesis: npp peaks at intermediate precipitation. Ecosystem productivity is strongly driven by climate + nutrients: what drives climate and nutrients, biogeochemical cycles, climate change. Accessible: in or available to living entities. Example: all of these cycles are driven by solar energy, via photosynthesis/npp and evaporation. Example: n cycle is driven by changes in chemical state which determine accessibility, while c and. Example: eutrophication and dead zones: many systems are limited by the availability of p and n. Example: consequences of land use change and erosion. Interactions among cycles: biogeochemical cycles are interconnected, npp is a major pump driving a lot of these cycles (influences c,
