Western Journal of Applied Forestry最新文献_第2页

Field Note: Impact of Spring or Fall Repeated Prescribed Fire on Growth of Ponderosa Pine in Eastern Oregon, USA 野外笔记:美国俄勒冈州东部春季或秋季重复规定火对黄松生长的影响

Western Journal of Applied Forestry Pub Date : 2013-07-01 DOI: 10.5849/WJAF.11-044

W. Thies, Douglas J. Westlind, M. Loewen

{"title":"Field Note: Impact of Spring or Fall Repeated Prescribed Fire on Growth of Ponderosa Pine in Eastern Oregon, USA","authors":"W. Thies, Douglas J. Westlind, M. Loewen","doi":"10.5849/WJAF.11-044","DOIUrl":"https://doi.org/10.5849/WJAF.11-044","url":null,"abstract":"Prescribed burning is used to reduce fuel loads and to return fire to its historic disturbance role in western forests. Managers need to know the effects of prescribed fire on tree growth. Growth of residual ponderosa pine (Pinus ponderosa Dougl. ex Laws.) was measured in an existing long-term study of the effects of season-of-prescribed burn in combination with a single or a repeated burn. Each of six previously thinned mixed-age stands in the Blue Mountains near Burns, Oregon, was subdivided into three experimental units, and one of three treatments was randomly assigned to each: fall 1997 burn, spring 1998 burn, and no burn (control). Treatments were operational-sized prescribed burns. In 2002/2003 each burned unit was split, and one-half was burned again, maintaining the original season of burn. Sample trees were evaluated for growth 5 and 10 seasons after the initial prescribed fires. We conclude that after accounting for the crown scorch proportion neither a single spring or fall prescribed fire treatment nor a repeated fire treatment 5 years later affected the growth of thinned ponderosa pine 10 years after the initial 1997/1998 fires. A linear regression is included to estimate bark thickness based on dbh.","PeriodicalId":51220,"journal":{"name":"Western Journal of Applied Forestry","volume":"28 1","pages":"128-132"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5849/WJAF.11-044","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70979931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Stream temperature and streamside cover 14-17 years after clearcutting along small forested streams, western Oregon 俄勒冈州西部，沿着小的森林溪流，经过砍伐后的14-17年，河流温度和河边覆盖

Western Journal of Applied Forestry Pub Date : 2013-07-01 DOI: 10.5849/WJAF.12-022

M. Newton, Liz Cole

{"title":"Stream temperature and streamside cover 14-17 years after clearcutting along small forested streams, western Oregon","authors":"M. Newton, Liz Cole","doi":"10.5849/WJAF.12-022","DOIUrl":"https://doi.org/10.5849/WJAF.12-022","url":null,"abstract":"Stream temperatures were monitored on seven low-elevation western Oregon streams immediately after clearcut harvesting and 14 –17 years later in two studies that examined buffer designs. One study on four streams used no-tree buffers with all trees next to the stream harvested within the clearcut units. The second study on three streams examined partial buffers designed to shade the stream only from direct sun. Streams with no-tree buffers in clearcuts 90 or 180 m long mostly exhibited significantly less warming 16 –17 years after harvest than 1–5 years after harvest. Streams with partial buffers had originally shown slight response to harvest, and 14 –15 years after harvest temperature trends were not different from preharvest trends. Percent cover and estimated radiation 14 –17 years after harvesting were mostly similar in harvested and uncut areas. The exceptions were areas close to the streams that were cleared by beavers (Castor canadensis), where streams were wide resulting in canopy openings, and where gravel bars with minimal plant development occurred. Planted conifers in no-tree riparian areas provided less shade than hardwoods and were mostly suppressed by hardwoods or damaged by beavers.","PeriodicalId":51220,"journal":{"name":"Western Journal of Applied Forestry","volume":"28 1","pages":"107-115"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5849/WJAF.12-022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70979731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Residual Densities Affect Growth of Overstory Trees and Planted Douglas-Fir, Western Hemlock, and Western Redcedar: Results from the First Decade 残留密度影响上层树木和人工道格拉斯冷杉、西部铁杉和西部红杉的生长:第一个十年的结果

Western Journal of Applied Forestry Pub Date : 2013-07-01 DOI: 10.5849/WJAF.12-019

L. C. Brodie, D. Debell

{"title":"Residual Densities Affect Growth of Overstory Trees and Planted Douglas-Fir, Western Hemlock, and Western Redcedar: Results from the First Decade","authors":"L. C. Brodie, D. Debell","doi":"10.5849/WJAF.12-019","DOIUrl":"https://doi.org/10.5849/WJAF.12-019","url":null,"abstract":"•In recent years, interest has increased in silvicultural systems and harvest cuts that retain partial overstories, but there are few data available on the growth of the understory trees in such stands. We studied the response of overstory trees and underplanted seedlings, Douglas-fir (Pseudofsugo menziesii), western hemlock (Tsuga heferaphylla), and western redcedar (Thuja plicafa), to a range of residual overstory densities. Forty to 70-year-old Douglas-fir stands in western Washington were harvested, leaving retention levels of 0, 8, 16, 24, 32, and 40% of full stocking. The 9-year response of the understory seedlings was species-dependent wnh Douglas-fir the largest in diameter (mean diameter 6.4 cm and mean height 3.8 m), western hemlock the tallest (mean diameter 5.5 cm and mean height 5.4 m), and redcedar the smallest (mean diameter 1.5 cm and mean height 1.5 m), in port because it was heavily browsed. Douglas-fir and western redcedar showed the greatest growth in the lowest retention levels (0 and 8%), and western hemlock responded best at the middle retention levels (8 and 16%).","PeriodicalId":51220,"journal":{"name":"Western Journal of Applied Forestry","volume":"28 1","pages":"121-127"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5849/WJAF.12-019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70979642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Field Note: Attributes of Windthrown Trees in a Sierra Nevada Mixed-Conifer Forest 野外笔记:内华达山脉混合针叶林中被风吹树的属性

Western Journal of Applied Forestry Pub Date : 2013-04-01 DOI: 10.5849/WJAF.12-027

K. Hilimire, Jonathan C. B. Nesmith, A. Caprio, R. Milne

引用次数: 4

Carbon Credit Possibilities and Economic Implications of Fuel Reduction Treatments 碳信用的可能性和燃料减少处理的经济影响

Western Journal of Applied Forestry Pub Date : 2013-04-01 DOI: 10.5849/WJAF.12-006

T. Vegh, Ching-Hsun Huang, A. Finkral

{"title":"Carbon Credit Possibilities and Economic Implications of Fuel Reduction Treatments","authors":"T. Vegh, Ching-Hsun Huang, A. Finkral","doi":"10.5849/WJAF.12-006","DOIUrl":"https://doi.org/10.5849/WJAF.12-006","url":null,"abstract":"We determined the difference in carbon (C) stocks and C emissions between treated and untreated ponderosa pine stands over 100 years on the Apache and Sitgreaves National Forests, Arizona, USA, under assumed treatment scenarios, wildfire frequency, and annual percentage of area burned. Compared with the no-action scenario, total C stocks (live and dead biomass) were lower in the treatment scenarios because of timber removals from thinnings, whereas aboveground live C stocks were higher in the treatment scenarios. When total C stocks were used as the baseline, net present values (NPVs) of treatments were in the range of -$759.42 and -$722.58 ha-1 if timber and reduced requirement for C in a buffer pool were assumed to be creditable, and NPVs increased significantly if C in wood products was also eligible for C credit. When aboveground live C stocks were chosen as the baseline, NPVs ranged from -$759.42 to $2,700.44 ha-1 with revenues from timber stumpage value, reduced buffer pool, and/or C in wood products. C emissions from simulated wildfires were lower in the two treatment scenarios than in the no-action scenario. The heavier thinning treatment resulted in lower C emissions from wildfires than with the lighter thinning treatment.","PeriodicalId":51220,"journal":{"name":"Western Journal of Applied Forestry","volume":"28 1","pages":"57-65"},"PeriodicalIF":0.0,"publicationDate":"2013-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5849/WJAF.12-006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70979898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Visitor preferences for campfires in US national forest developed campgrounds. 在美国国家森林开发的露营地，游客对篝火的偏好。

Western Journal of Applied Forestry Pub Date : 2013-04-01 DOI: 10.5849/WJAF.12-016

J. Lillywhite, J. Simonsen, J. Fowler

引用次数: 8

Total and Merchantable Volume of White Spruce in Alaska 阿拉斯加白云杉的总贸易量

Western Journal of Applied Forestry Pub Date : 2013-04-01 DOI: 10.5849/wjaf.12-003

T. Malone, Jingjing Liang, E. C. Packee

引用次数: 1

Pricing forest biomass for power generation. 为森林生物质发电定价。

Western Journal of Applied Forestry Pub Date : 2013-04-01 DOI: 10.5849/WJAF.12-012

J. Sessions, Kevin Tuers, K. Boston, Rene Zamora, Roy Anderson

引用次数: 13

Nondestructive Aging of Postfire Seedlings for Four Conifer Species in Northwestern Montana 蒙大拿州西北部四种针叶树火后幼苗的无损老化研究

Western Journal of Applied Forestry Pub Date : 2013-01-01 DOI: 10.5849/WJAF.11-014

Alexandra K. Urza, Jason S. Sibold

引用次数: 38

The Effect of Timber Harvest on Summer Low Flows, Hinkle Creek, Oregon 木材采伐对夏季低流量的影响，欣克尔溪，俄勒冈

Western Journal of Applied Forestry Pub Date : 2013-01-01 DOI: 10.5849/WJAF.11-038

C. Surfleet, A. Skaugset

{"title":"The Effect of Timber Harvest on Summer Low Flows, Hinkle Creek, Oregon","authors":"C. Surfleet, A. Skaugset","doi":"10.5849/WJAF.11-038","DOIUrl":"https://doi.org/10.5849/WJAF.11-038","url":null,"abstract":"Changes to summer low flows from forest harvesting were measured for a gauged fourth-order stream in the Hinkle Creek Paired Watershed Study. At the gauged stream, August streamflow increased an average of 1.9 mm/year (45%) for the three summers following forest harvest of 13% of a 1,084 ha watershed. Following a second harvest of an additional 13% of the watershed the August streamflow increased by 4.5 mm (106%) the first summer and 2.0 mm (47%) the second summer. Master recession curves were fit to the gauged watersheds and the resulting recession coefficients were used to predict low flows from small watersheds nested within the gauged watersheds. The estimated low flows were used to evaluate changes in summer low flows associated with forest harvest for the small watersheds. Using recession curve analysis, the estimated range of the increase for average August streamflow for the four small watersheds in the Hinkle Creek Paired Watershed Study was 1.7 mm to 4.4 mm the first summer following forest harvest. August streamflow in the small watersheds was not distinguishable from preharvest levels within 5 years for all but one watershed, which had the highest proportion of watershed area harvested.","PeriodicalId":51220,"journal":{"name":"Western Journal of Applied Forestry","volume":"28 1","pages":"13-21"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5849/WJAF.11-038","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70979719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 23