Estimation Procedures for the Combined 1990s Periodic Forest Inventories of California, Oregon, and Washington
Estimation Procedures for the Combined 1990s Periodic Forest Inventories of California, Oregon, and Washington

Author: Tara M. Barrett

Publisher:

Published: 2004

Total Pages: 28

ISBN-13:

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During the 1990s, forest inventories for California, Oregon, and Washington were conducted by different agencies using different methods. The Pacific Northwest Research Station Forest Inventory and Analysis program recently integrated these inventories into a single database. This document briefly describes potential statistical methods for estimating population totals, means, and associated sampling errors for these inventories. Differences in estimates using past methods for periodic inventories compared to estimates from proposed methods for a new annual inventory system were generally minor. This document is intended to be a resource for researchers using the 1990s forest inventory data for these states; examples are included to illustrate issues.

Ozone Injury in West Coast Forests
Ozone Injury in West Coast Forests

Author: Sally J. Campbell

Publisher:

Published: 2007

Total Pages: 64

ISBN-13:

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Six years of monitoring for ozone injury by the Pacific Northwest Research Station Forest Inventory and Analysis Program are reported. The methods used to evaluate injury, compute an injury index, and estimate risk are described. Extensive injury was detected on ozone biomonitoring sites for all years in California, with ponderosa and Jeffrey pines, mugwort, skunkbush, and blue elderberry showing injury. Little or no injury was detected in Oregon and Washington. The relation of observed injury to ambient ozone levels is discussed. The areas with the highest modeled risk of ozone injury are the areas east of Los Angeles, the southern Sierra Nevada, and portions of the central coast.