Sources of nutrients to terrestrial systems. 1. Wet deposition. Inputs 2. Recycling Organic Inorganic Rates influenced by: Climate Quality of detritus. 1. Dry deposition. 1. N-fixation. 2*. Recycling. Soil. 1. Weathering. Parent material.
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Nutrient regeneration in terrestrial systems
Breakdown of organic material through decomposition
occurs in several different ways
Climate: Tropical vs. Temperate
What does this tell you
about which abiotic factors
are most important in terms
of controls over rates of
Soils as a compartment
Low clay content of soils in the tropics results in nutrients washing out of the soil unless there is quick uptake by plants
As a result, most nutrients are found in living biomass rather than soils: important implications of tropical deforestation
Nutrient regeneration in aquatic systems
Productivity in aquatic ecosystems
Global distribution of chlorophyll in oceans
Where is productivity highest?
Shallow seas, proximity to bottom sediments
Strong upwelling zones
Low levels of NH4+, NO3-2