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تعداد نتایج: 351

Live-tree Carbon in the Pacific Northwest

Estimates and Uncertainties

جزئیات و درخواست

By Susanna L. Melson
2004
Pages: 436
Language: en
OTHER:OCLC:60696633
Subject: Carbon cycle (Biogeochemistry)

Forest Inventory-based Estimation of Carbon Stocks and Flux in California Forests in 1990

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جزئیات و درخواست

By Jeremy Steven Fried, Xiaoping Zhou
2008
Pages: 32
Language: en
OTHER:MINN:31951D029812265
Subject: Carbon sequestration

Estimating Aboveground Tree Biomass on Forest Land in the Pacific Northwest: A Comparison of Approaches

جزئیات و درخواست

Publisher: DIANE Publishing,
Pages: 25
Language: en
ISBN_13:9781437983470
ISBN_10:1437983472

Carbon Storage in a Pacific Northwest Conifer Forest Ecosystem

A Chronosequence Approach

$As concern over global warming intensifies, sequestration and storage of atmospheric CO2 has become an important scientific and policy issue. Confusion persists, however, over interpretation of forest carbon (C) source-sink dynamics, in part because conclusions drawn depend on temporal and spatial scales of analysis (e.g. day-week scale vs. successional-scale), type of disturbance, and methodology (e.g. massbased vs. flux-based). There is a need to resolve this confusion given that strategies for mitigating anthropogenic CO2 emissions are based on estimates of forest C fluxes during various stages of succession, over which C fluxes and stores may change. Empirical study of changes in forest C stores can help to resolve this confusion by clarifying the C sources-sink dynamics of forests in space and time. To better understand the impacts of disturbance on C source-sink dynamics, changes in C stores of an evergreen-dominated forest on the Wind River Ranger District in Southwestern Washington, U.S.A., were investigated along a 500-year chronosequence of 36 stands. Principle objectives were to evaluate 1) decomposition rates (k) of logs, stumps, and below-ground coarse roots, 2) net primary productivity (NPP) of dominant tree species' boles at the stand level, and 3) successional changes in net ecosystem productivity (NEP) for live trees and coarse woody debris (CWD), here called NEPW. In the case of decomposition, log and stump k values did not differ significantly within the two principle species studied, indicating substitution of log k values for stump k values in models of forest C budgets may be valid when stump decomposition data is lacking. Decomposition rates between species differed, with Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) decomposing more slowly (k = 0.013 yr-1) relative to western hemlock (Tsuga heterophylla (Rafi) Sarg. (k = 0.036 yr-1). This difference in k between species was observed for both above-ground stumps and logs as well as below-ground coarse roots. Given our mean k estimates and adjusting for regenerating stand age, these stands are losing C at a rate of 0.16-0.83 Mg C ha-1 yr-1 (assuming all CWD is P. menziesii) to 0.13-1.68 Mg C ha-1 yr-1 (assuming all CWD is T. heterophylla) from stumps, logs, and snags. Including coarse roots increases these losses to 0.28-1.25 Mg C ha-1 yr-1 and 0.30-2.53 Mg C ha-1 yr-1, respectively. Based on these findings, if fragmentation of these decomposing C pools is ignored, and fragmented fractions have oxidized to CO2, stands thought to be net C sinks could in reality be net C sources to the atmosphere. Net primary production in tree boles (NPPb) of regenerating stands (so called second-growth) ranged between 0.15-5.28 Mg C ha-1 yr-1. NPPb of 500-year old stands ranged between 1.3-3.9 Mg C ha-1 yr-1, similar to NPPb of boles in 20-25 year old secondgrowth. Mean radial increment widths from old-growth stands indicated that NPPb of these stands (neglecting mortality) can increase, decrease, or remain relatively constant. Based on 5-year increments for the previous fifteen years, the majority of old-growth stands sampled showed small increases in radial growth over time. Timing of the transition from negative to positive of NEPW ranged between 0 and 57 years after disturbance and depended strongly on live-tree growth rates as well as the fate of CWD and harvested wood. Estimated maximum and minimum NEPW were 3.9 Mg C ha-1 yr-1 and 14.1 Mg C ha-1 yr-1, respectively. Maximum mean C stores of 393 Mg C ha-1 were reached approximately 200 years after disturbance. At a rotation age of 80 years, regenerating stands stored approximately 50% as much C in woody biomass as a 500-year old primary forest, indicating conversion of older forests to plantations released C to the atmosphere. Given the high biomass of mature and old-growth stands relative to younger regenerating stands in the forest studied, landscape C stores in live wood would appear to be maximized in stands of older age classes.$

جزئیات و درخواست

By Jack E. Janisch
2001
Pages: 340
Language: en
OTHER:OCLC:53715290
Subject: Carbon cycle (Biogeochemistry)

Methods for Calculating Forest Ecosystem and Harvested Carbon with Standard Estimates for Forest Types of the United States

Free Epub

جزئیات و درخواست

2006
Pages: 224
Language: en
OTHER:MINN:31951D02881922S
Subject: Carbon sequestration

Timber Volume and Aboveground Live Tree Biomass Estimations for Landscapes Analyses for the Pacific Northwest

جزئیات و درخواست

By Zhou
Publisher: CreateSpace, 2015-01-03
Pages: 36
Language: en
ISBN_10:1505913713
ISBN_13:9781505913712

Storage and Flux of Carbon in Live Trees, Snags, and Logs in the Chugach and Tongass National Forests

جزئیات و درخواست

By Tara M. Barrett
2014
Pages: 44
Language: en
OTHER:LCCN:2013481541
Subject: Carbon cycle (Biogeochemistry)

Timber Volume and Aboveground Live Tree Biomass Estimations for Landscape Analyses in the Pacific Northwest

جزئیات و درخواست

By Xiaoping Zhou
2010
Pages: 31
Language: en
OTHER:LCCN:2011505855
Subject: Forest biomass

Estimating Aboveground Tree Biomass on Forest Land in the Pacific Northwest

A Comparison of Approaches

جزئیات و درخواست

By Xiaoping Zhou, Miles A. Hemstrom
2009
Pages: 18
Language: en
OTHER:OCLC:501835071
Subject: Forest biomass

A Forest of Your Own

The Pacific Northwest Handbook of Ecological Forestry

جزئیات و درخواست

By Kirk Hanson, Seth Zuckerman
Publisher: Mountaineers Books, 2024-04-01
Pages: 359
Language: en
ISBN_13:9781680516371
ISBN_10:168051637X
Subject: Nature

Carbon Storage and Accumulation in United States Forest Ecosystems

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جزئیات و درخواست

By Richard A. Birdsey
1992
Pages: 60
Language: en
OTHER:MINN:31951D02988385M
Subject: Atmospheric carbon dioxide

Old-growth Forest in the Pacific Northwest

Hearing Before the Subcommittee on Public Lands and Forests ...

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جزئیات و درخواست

By United States. Congress. Senate. Committee on Energy and Natural Resources. Subcommittee on Public Lands and Forests
2008
Pages: 80
Language: en
OTHER:PSU:000063524864
Subject: Business & Economics

Ecophysiological Parameters for Pacific Northwest Trees

Free Epub

جزئیات و درخواست

2004
Pages: 22
Language: en
OTHER:MINN:31951D02977021Z
Subject: Ecophysiology

Timber Volume and Aboveground Live Tree Biomass Estimations for Landscape Analyses in the Pacific Northwest

جزئیات و درخواست

By Xiaoping Zhou
2010
Language: en
OTHER:LCCN:2011505855
Subject: Forest biomass

Final Report on the Project Entitled "The Effects of Disturbance & Climate on Carbon Storage & the Exchanges of CO2 Water Vapor & Energy Exchange of Evergreen Coniferous Forests in the Pacific Northwest

Integration of Eddy Flux, Plant and Soil Measurements at a C...

جزئیات و درخواست

2011
Language: en
OTHER:OCLC:953405661

Colossal Carbon!

Disturbance and Biomass Dynamics in Alaska's National Forest...

جزئیات و درخواست

By John Kirkland
2016
Pages: 5
Language: en
OTHER:OCLC:1039882530
Subject: Chugach National Forest

There's Carbon in Them Thar Hills

But how Much? Could Pacific Northwest Forests Store More?

جزئیات و درخواست

By Andrew Gray
2017
Pages: 5
Language: en
OTHER:OCLC:986537085
Subject: Plants

The Effects of Disturbance and Climate on Carbon Storage and the Exchanges of CO2 Water Vapor and Energy Exchange of Evergreen Coniferous Forests in the Pacific Northwest

Integration of Eddy Flux, Plant and Soil Measurements at a C...

جزئیات و درخواست

2011
Pages: 12
Language: en
OTHER:OCLC:1065805677

Forest Landscapes and Global Change

Challenges for Research and Management

جزئیات و درخواست

By João C. Azevedo, Ajith H. Perera, M. Alice Pinto
Publisher: Springer, 2014-07-11
Pages: 271
Language: en
ISBN_13:9781493909537
ISBN_10:1493909533
Subject: Science

Research Paper PNW.

Free Epub

جزئیات و درخواست

1978
Pages: 220
Language: en
OTHER:UCBK:C106227787
Subject: Forests and forestry

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