Kategóriák: Minden - fungi - photosynthesis - nitrogen - nutrients

a deborah o'donnell 11 éve

259

sustainability web

Coastal fog plays a crucial role in the ecosystem of old-growth coast redwood forests. It helps decrease temperatures, increase humidity, and reduce solar radiation, which prevents denitrification.

sustainability web

ocean circulation patterns

cold ocean temperatures

atmospheric high pressure

dead trees/logs (auotgenic engineers) environment for nitrifixation, animals, and microbes.

birds (Pileated Woodpecker)

Sometimes causes decay on upper trunk
control insect infestations

saproxylic insects

insect infestations, herbivores
makes cavaties for birds

microlitter,CWD, litterfall

decomposition of organic material

allogenic engineers (possibly aid in regeneration of plants)

soil protozoa, invertebrates, fauna

NH3

reduce fungi favoring bacteria

saprophages (bacteria, fungi, macroinvertebrates)

immobilize, mineralize nutrients (nutrient conservation)

transfers nutrients from soil to litter through hyphae

chelators (increase solubility of nutrients)

nitrogen-fixation

Endangered species

Spotted Owl

Marbled Murrelet

animals/insects (disperse fungi and seeds)

cerambycid beetle

chickaree

canopy drip

Disturbances

logging

possible old-growth recovery over time
monoculture sites drains nutrients and soil organisms from soil
causes invasive species because of excess solar radiation
compacting soil (which negeatively effects plants because less oxygen and water. With less vegetation there is more solar radiation and denitrifiers prosper, taking the nitrogen out of the soil), damage aquatic sites,

global warming

increase in temperature, less fog, moisture, and possible drought which leads to insufficient nutrients, and less primary productivity.

fires

It can also cause loss of nutrients through heat and fly ash.
controls pests
minerals from leaching
Coast redwood has high resistance and fire thins understory allowing more nutrient availability for the old-growth trees (reduces competition and monitors invasive species).

floods

soil minerals

erosion/landslides

change aquatic sites, causes silt to alter fish habitats, loss of steep banks
colluvial and alluvial sites

soil compostion (nutrients)

pH

Diversity in plants (Keeps soil nutrient rich and promotes soil organisms)

lower nutrient

Pigmy forest-provides a range of habitats through this ecotone

plants

moisture

regeneration

nutrients, water, sunlight

wood rats strip bark off new trees

foliar uptake (80% redwood forest species)

Coastal Fog

Decrease temperature, increase humidity, reduce solar radiation (prevents denitrification)

Douglas fir

fisher

marten

voles

OLD-GROWTH COAST REDWOOD

Lichen (alga and fungus-rock weathering for soil) (endophytes inhibit plant pathogens)

tree crown (nutrients from air through epiphytes)

coastal fog reduces transpiration, which keeps stomata open, allowing for more carbon dioxide intake.
photosynthesis
Oxygen

roots/exudates

hyphae from mycorrhizal fungus
rizosphere (good in droughts): organic acids, enzymes, amino acids, proteins, simple sugars, carbon

Mycorrhizal Network (connects fungus, bacteria, and roots from plants and trees. Keystone for redwood forest.)

nitrification (nitrate) ammonia
plant hormones
nutrient transfer (especailly phosphorus)
indirectly water transfer for photosynthesis
mycorrhizal propagules
mammals

carbohydrates

carbon