Estimation Procedures for the Combined 1990s Periodic Forest Inventories of California, Oregon, and Washington PDF Download
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Author: Tara M. Barrett Publisher: ISBN: Category : Forest surveys Languages : en Pages : 28
Book Description
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.
Author: Tara M. Barrett Publisher: ISBN: Category : Forest surveys Languages : en Pages : 28
Book Description
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.
Author: Publisher: ISBN: Category : Forest surveys Languages : en Pages :
Book Description
Combines data from eight different forest inventories conducted by the Forest Service and the Bureau of Land Management in California, Oregon and Washington from 1990-2000.
Author: Jeremy Steven Fried Publisher: ISBN: Category : Carbon sequestration Languages : en Pages : 32
Book Description
Estimates of forest carbon stores and flux for California circa 1990 were modeled from forest inventory data in support of California's legislatively mandated greenhouse gas inventory. Reliable estimates of live-tree carbon stores and flux on timberlands outside of national forest could be calculated from periodic inventory data collected in the 1980s and 1990s; however, estimation of circa 1990 flux on national forests and forests other than timberland was problematic owing to a combination of changing inventory protocols and definitions and the lack of remeasurement data on those land categories. We estimate annual carbon flux on the 7.97 million acres of timberlands outside of national forests (which account for 24 percent of California's forest area and 28 percent of its live tree aboveground biomass) at 2.9 terragrams per year.
Author: Publisher: ISBN: Category : Forest ecology Languages : en Pages : 198
Book Description
This report highlights key findings from the most recent (2001-2005) data collected by the Forest Inventory and Analysis Program across all forest land in California. We summarize and interpret basic resource information such as forest area, ownership, volume, biomass, and carbon stocks; structure and function topics such as biodiversity, forest age, dead wood, and hardwood forests; disturbance topics such as insects and diseases, fire, invasive plants, and air pollution; and information about the forest products industry in California, including data on tree growth and mortality, removals for timber products, and nontimber forest products. The appendixes describe inventory methods in detail and provide summary tables of data, with statistical error, about the suite of forest characteristics inventoried.
Author: Bruce A. Hiserote Publisher: ISBN: Category : Forest surveys Languages : en Pages :
Book Description
Combines data from eight different forest inventories conducted by the Forest Service and the Bureau of Land Management in California, Oregon and Washington. These inventories were organized and executed by five individual forest inventory programs from two agencies, including the Forest Inventory and Analysis (FIA) program of the Pacific Northwest Research Station (PNWFIA), the Interior West FIA program of the Rocky Mountain Research Station (RMRS), the Continuous Vegetation Survey program of the Pacific Northwest Region (R6, Region 6), the Forest Inventory program of the Pacific Southwest Region (R5, Region 5), and the Natural Resource Inventory program of the Bureau of Land Management (BLMWO, western Oregon districts only). The eight inventories include Western Oregon, Eastern Oregon, California, Western Washington, and Eastern Washington from PNWFIA, California from R5, Oregon and Washington (as one inventory) from R6, and Western Oregon from BLM. Note that PNWFIA collects data on all BLM lands except those in western Oregon; and RMRS collects data on National Forest land in Washington (Kaniksu NF, R1) and California (Toiyabe NF, R4).
Author: Publisher: ISBN: Category : Forest ecology Languages : en Pages : 202
Book Description
This report highlights key findings from the most recent (2001-2005) data collected by the Pacific Northwest Forest Inventory and Analysis (PNW-FIA) Program across all ownerships in Oregon. We present basic resource information such as forest area, land use change, ownership, volume, biomass, and carbon sequestration; structure and function topics such as biodiversity, older forests, dead wood, and riparian forests; disturbance topics such as insects and diseases, fire, invasive plants, and air pollution; and information about the forest products industry in Oregon, including data on tree growth and mortality, removals for timber products, and nontimber forest products. The appendices describe inventory methods and design in detail and provide summary tables of data, with statistical error, for the suite of forest characteristics sampled.
Author: Bianca N. I. Eskelson Publisher: ISBN: Category : Forest monitoring Languages : en Pages : 280
Book Description
The Forest Inventory and Analysis (FIA) program conducts an annual inventory throughout the United States. In the western United States, 10% of all plots (one panel) are measured annually, and a moving average is used for estimating current condition and change of forest attributes while alternative methods are sought in all regions of the United States. This dissertation explored alternatives to the moving average in the Pacific Northwest using Current Vegetation Survey data collected in Oregon and Washington. Several nearest neighbor imputation methods were examined for their suitability to update plot-level forest attributes (basal area/ha, stems/ha, volume/ha, biomass/ha) to the current point in time. The results were compared to estimates obtained using a moving average and a weighted moving average. In terms of bias and accuracy, the weighted moving average performed better than the moving average. When the most recent measurements of the variables of interest were used as ancillary data, randomForest imputation outperformed both the moving average and the weighted moving average. For estimating current basal area/ha, stems/ha, volume/ha, and biomass/ha, tree-level imputation outperformed plot-level imputation. The difference in bias and accuracy between tree- and plot-level imputation was more pronounced when the variables of interest were summarized by species groups. Nearest neighbor imputation methods were also investigated for estimating mean annual change in selected forest attributes. The imputed mean annual change was used to update unmeasured panels to the current point in time. In terms of bias and accuracy, the resulting estimates of current basal area/ha, stems/ha, volume/ha, and biomass/ha outperformed the results obtained using plot-level imputation. Information on hard to estimate forest attributes such as cavity tree and snag abundance are important for wildlife management plans. Using FIA data collected in Washington, Oregon, and California, nearest neighbor imputation approaches and negative binomial regression models were examined for their suitability in estimating cavity tree and snag abundance. The negative binomial models were preferred to the nearest neighbor imputation approaches.
Author: Tara M. Barrett
Author: Tara M. Barrett
Author: Tara M. Barrett
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Author: 
Author: Jeremy Steven Fried
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Author: Bruce A. Hiserote
Author: Charles L. Bolsinger
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Author: Bianca N. I. Eskelson