Level IV: (80d) Pluvial Lake Basins

Level IV: (80d) Pluvial Lake Basins

 The Pluvial Lake Basins ecoregion contained vast lakes during the Pleistocene epoch that have now mostly disappeared. It is characterized by gently sloping, internally drained basins with lake terraces, playas, beach plains, stream terraces, intermittent lakes, fan skirts, and cool springs. Elevation varies from 4,200 to 6,200 feet (1,280 to 1,890 m). Some basin floor playas collect and evaporate water seasonally, but not as extensively as the High Desert Wetlands. Dry lake beds near the Cascade Mountains have a significant layer of volcanic ash.

Greasewood, inland saltgrass, and seepweed grow in alkaline soils. Better drained, less alkaline soils are dominated by Wyoming big sagebrush and basin big sagebrush, with rubber rabbitbrush, Great Basin wildrye, bottlebrush squirreltail, Indian ricegrass, Sandberg’s bluegrass, Thurber’s needlegrass, and cheatgrass.

The land is used for rangeland and sprinkler-irrigated alfalfa farming.

The region covers 2,092 square miles (5,418 km2) in Oregon and 342 square miles (886 km2) in Nevada.

Source: Wikipedia

Advertisements

One comment

  1. Pingback: Late June Road Trip to Summer Lake Area – Photo Dump | field studies from portland

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s