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Lecture 13
Southwestern Interior Forests
16
Biology
Undergraduate 1
11/01/2010

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Term
How does moisture change as you move up in elevation in the Southwestern interior forests?
Definition
Moisture level increases as you move up in elevation, from xeric to mesic.
Term
name the three community types of the Southwest interior forests:
Definition

-foothill oak woodlands

-mixed oak forests

-mixed conifer forests

Term
name the main oak species that dominates the foothill oak woodlands:
Definition
blue oak
Term
Where is the foothill oak woodlands located?
Definition
It is located around the central valley, at about 100-800 meters in elevation.
Term

name the oak species that dominates the mixed oak community:

 

Definition
canyon live oak
Term
Which community in the Southwestern interior forests is a transition zone?
Definition
Mixed oak community-transition zone between the oak foothill community and the mixed conifer community
Term
Where is the mixed conifer community type found?
Definition
-at elevations of 800 meters-2600 meters in mountain ranges
Term
Which species dominate the drier sites of the Southwestern interior forests?
Definition
Jeffrey pine and Ponderosa pine
Term
Which species dominate the mesic sites of the Southwest interior forests?
Definition
white fir, and then red fir at increasing elevations
Term
What are the two main community types of the intermountain region of the Southwest interior forests?
Definition
sagebrush steppe and pinyon-juniper
Term
name and describe the main feature of the intermountain region of the Southwest interior forests:
Definition
cold desert-high elevations and very dry-cold in the winter, but very hot in the summer
Term
What dominates the climate of the intermountain region of the Southwest interior forests?
Definition
the rainshadow effect created by the Sierra Nevada mountains to the west
Term
Which species dominates the xeric regions of the intermountain lowlands of the Southwest interior forests?
Definition
big sagebrush
Term
What is a major adaptation of big sagebrush?
Definition
Dimorphism of leaves-large leaves develop in early spring when moisture levels are high and then drop and get replaced with smaller evergreen leaves later in the summer when moisture levels are low
Term
describe the climate and soils of the pinyon-juniper community:
Definition
temperature swings are dramatic, from very hot to very cold with snow, and soils are very well-drained and dry
Term
describe how fire suppression has changed the pinyon-juniper community:
Definition
fire suppression has caused pinyon-juniper forests to expand upward into grasslands, reducing open grassland habitat
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