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Carrizo Plain

Ecoregion in Coast Ranges, CA

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The Carrizo Plain ecoregion is a nearly level to very gently sloping alluvial plain with low hills on the margins. Although the ecoregion is in the Coastal Ranges, the climate is arid with long dry summers, similar to a desert basin. Average annual precipitation is only 7–9 inches per year. Runoff from the surrounding coastal mountains and hills flows in ephemeral drainage channels to Soda Lake, a terminal alkali lake. The inflow is lost to evaporation, leaving behind concentrated salts and minerals. The soil temperature regime is thermic and soil moisture regimes are aridic and xeric. Vegetation includes annual grassland, needlegrass, saltgrass, and emergent aquatics. Ecoregion 6an is one of the largest areas of native grassland remaining in the State. It is home to several endangered wildlife species, including the San Joaquin kit fox, San Joaquin antelope squirrel, and the blunt-nosed leopard lizard. Tule elk and pronghorn antelope have been reintroduced to the area. Some livestock grazing occurs, but remains a controversial issue.

— EPA

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