california’s diverse vegetation part 2sagarver/geo351/veg_part2.pdf · desert scrublands •...
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California’s Diverse Vegetation Part 2
GEO 351 Dr.Garver
Map of Biomes and Climate Principal Biomes
Floristic Provinces Map
Floristic Provinces
Deserts of N. America
Desert Scrublands
• “Rainshadow Biome”
• Less than 10 in/yr rain
• T regularly above 110 deg F in summer
• Below freezing at night in winter
• Drought adapted plants
• Open space between plants
• Sagebrush, Creosote, Sage, Mesquite
• Saguaro, Agave, Fan Palms
Desert vegetation
Joshua Tree
Ocotillo
Desert vegetation
Creosote
Prickly Pear
Desert vegetation
Yucca
Barrel Cactus
Palm Springs Hike
Palm Springs Hike
Palm Springs Hike
Palm Springs Hike
Palm Springs Hike
Palm Springs Hike
Palm Springs Hike
Palm Springs Hike
Death Valley
Mojave desert
Mojave Desert – Big Horn Sheep
Mojave desert
Mojave Desert – Silver Fox
Principal Biomes
Chaparral and Coastal
Shrublands
Chaparral by County (in acres)
San Diego 1,003,441 Los Angeles 553,789 Riverside 499,160 Santa Barbara 440,645 San Luis Obispo 417,718 Monterey 369,345 Ventura 326,447 San Bernardino 276,010 San Benito 246,623 Santa Clara 188,427 Orange 111,550 Marin 37,566 San Mateo 36,152 Santa Cruz 32,328
Chaparral and Coastal Shrublands
• CA’s version of Mediterranean vegetation
• Thick, evergreen scrub
• Concentrated (though mixed) on W and SW slopes
of Coastal Mts.
• Fire climax community
• Manzanita, sumac, ceonothus, purple sage, scrub
oak
• Precip. 10 to 25 in/yr
Chaparral Mosiac
Chaparral Mosaic
Santa Barbara
Santa Barbara
Santa Barbara
Simi Valley
Simi Valley - New Houses
Simi Valley – Sed. Rocks
Simi Valley
Manzanita
Most flammable vegetation in U.S.
• Many species well-adapted to fire
• Some encourage fire
• Ceanothus, has leaves that are coated with
flammable resins, seeds require intense heat
for germination, roots are specially adapted
to grow in areas recently burned.
Fires
Fires
Fire serves to replace older plants with younger,
more productive ones.
210 Fwy
Fires
View from CRS – Santa Ana winds blowing ash from Angeles fire
Chaparral • Found where
– summers long and hot
– might not rain for half a year+
• plant community composed of small shrubs
and bushes that are adapted to fire.
• Hillsides covered by stiff bushes that grow
close together (~10 feet high).
Chaparral • As bushes get older, dead wood accumulates
• Needs fire as part of their lives, species could
die out if fire didn't occur.
– shiny and waxy covering, seals in water.
– wax causes the leaves to burn hot in a fire.
How can dying in a fire help?
• After the fire there is space to grow, water,
and sunlight for energy.
• Seeds may have been in the soil for years
– Special outer coat doesn't allow water to
cause the seed to sprout.
• Some species of chaparral sprout from stumps.
– keep a lot of energy in their roots, and after the
top of the plant burns off, they simply sprout
new leaves and branches.
– In this way, some plants may survive many
fires, and could be hundreds of years old.
Resprouting
Mixed chaparral above oak woodland - Malibu Creek State Park.
Ceanothus Chaparral - San Mateo Wilderness, Cleveland National Forest.