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Unformatted text preview: A. Seasonality of rainfall. Dashed line in slide. If rainfall is seasonal, get more woody vegetation; otherwise get grassland. B. Soil type: rocky soils dont hold water that well this gives vegetation that would otherwise grow in areas with less precipitation. V. We can look at the productivity and biomass of biome types: Biome type Net Primary Productivity Plant Biomass (% world) g/m 2-yr (% world) Tropical rainforest 22 % 1000-3500 42% Tropical seasonal 7 14 (= deciduous) forest Tropical savanna 8 3 All terrestrial, 60% 99.8% fresh water All marine (mostly 40% 0.2% * open ocean) Open ocean 2-400 Yet marine has 70% of Earths surface *Class: remember the inverted biomass pyramid in the ocean (Topic 16), not much phytoplankton biomass....
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- Fall '08