Nutrient regeneration Part 1terrestrial ecosystems - PowerPoint PPT Presentation
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Nutrient regeneration Part 1terrestrial ecosystems
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mycorrhizae provide plants with mineral nutrients. high quality detritus faster regeneration ... enzymes, H to decompose detritus, and access minerals that ... – PowerPoint PPT presentation
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Title: Nutrient regeneration Part 1terrestrial ecosystems
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Nutrient regenerationPart 1terrestrial
ecosystems
- NR occurs mostly in aerobic soils
- mycorrhizae provide plants with mineral
nutrients - high quality detritus ? faster regeneration
- warm, humid climates ? faster regeneration
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- NR occurs mostly in aerobic soils
10 from weathering (new) 90 from
decomposition of detritus
Plant nutrients
New inputs to watershed
Losses from watershed
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- mycorrhizae provide plants with mineral nutrients
(esp. trees, shrubs)
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selective advantage, esp. where nutrient-poor
soils
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hyphae
because of mycorrhizae, plants get more
nutrients from soil (while these fungi get
glucose from plant)
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- fungi
- increase absorptive surface area, range
- secrete enzymes, H to decompose detritus,
- and access minerals that plants can not
- help exclude plant pathogens (antibiotics,
physical) - plants
- give fungi up to 15 of production (glucose)
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- high quality detritus ? faster regeneration
- NR processes
- Leaching of soluble nutrients (10-30 fallen
leaves) - Detritivores (30-45)
- Fungi break down cellulose, lignin
- Bacteria decompose everything else
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Leaf species affects decomposition rate
ex mulberry gt maple gt pine ( lost 1st
year)
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- warm, humid climates ? faster regeneration
Temperate soils retain nutrients 10X longer than
tropical soils
- Organic matter in soil litter
- gt 50 (temperate forests)
- lt 25 (tropical rain forests)
- --why?
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