BIOL 2060 Lecture Notes - Lecture 26: Erosion Control, Soil Fertility, Heterotroph
19 Mar 2018
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March 19, 2018: ecosystem: a biological community plus all the abiotic factors influencing that community, absorbs, transforms, and stores energy, water and nutrients, eg. Latitudinal and seasonal npp patterns: a: total npp (solid line), land (dotted), and ocean (dashed, land highest closer to equator, b: land by season, april-jun (solid line) Jan-mar (long dashed: c: ocean by season, more on either side of equator, tropical rainforests and savannas have the highest level, desert least. North american grasslands: all sites similar temperature, but as the precipitation increased, the. Artic tundra: variation in terrestrial npp can be explained by differences in soil fertility: e. g. Boreal forests: added nutrients for a few years, biomass increases, response of individual species more varied. How does npp vary in aquatic ecosystems: usually positively related to algal biomass. Can biota influence npp: bottom-up controls: by physical and chemical factors of an ecosystem, top-down controls: by consumers, ex.
