Abstract

The environment and phytosociological characteristics of the pinyon woodland zone of the White Mountains of California are described and contrasted with those of other southwestern representatives of this vegetation type. The pinyon woodland zone of the White Mts. is floristically allied to Nevada and parts of Utah. The White Mt. zone is unique in the high upper elevation limit it attains (9,500 ft) and in the low amount of average annual precipitation it receives (8 to 12 inches). Apparent fluctuations in population structure of pinyon pine through time are related to grazing history and catastrophic climatic events.

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