BIOL150 Chapter 4: Biol 150 Chap 4 The Terrestrial Environment
14 Sep 2018
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Biomes: broad-leaved evergreen forests, deserts, and grasslands majoring groupings of plant and animal communities defined by a dominant vegetation type. The nature of biome is governed by (1) average annual temperature and precipitation and (2) annual variation in temperature and precipitation. Net primary productivity (npp): total amount of carbon that is fixed per year minus the amount that is oxidized during cellular respiration, represents the organic matter that is available as food for other organisms. Biomass: fixed carbon that is being consumed in cellular respiration provides energy for the organism but is not used for growth. Above-ground biomass: the total mass of living plants, excluding roots. Photosynthesis, plant growth, and npp are maximized on land when temperatures are warm and conditions are wet. Photosynthetic rates are maximized in warm temperatures when enzymes work efficiently and in humid weather when stomata can remain open and carbon dioxide is readily available.
