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  1. Article: Conifer regeneration following stand-replacing wildfire varies along an elevation gradient in a ponderosa pine forest, Oregon, USA

    Dodson, Erich Kyle / Root, Heather Taylor

    Forest ecology and management. 2013 Aug. 15, v. 302

    2013  

    Abstract: Climate change is expected to increase disturbances such as stand-replacing wildfire in many ecosystems, which have the potential to drive rapid turnover in ecological communities. Ecosystem recovery, and therefore maintenance of critical structures and ... ...

    Abstract Climate change is expected to increase disturbances such as stand-replacing wildfire in many ecosystems, which have the potential to drive rapid turnover in ecological communities. Ecosystem recovery, and therefore maintenance of critical structures and functions (resilience), is likely to vary across environmental gradients such as moisture availability, but has received little study. We examined conifer regeneration a decade following complete stand-replacing wildfire in dry coniferous forests spanning a 700m elevation gradient where low elevation sites had relatively high moisture stress due to the combination of high temperature and low precipitation. Conifer regeneration varied strongly across the elevation gradient, with little tree regeneration at warm and dry low elevation sites. Logistic regression models predicted rapid increases in regeneration across the elevation gradient for both seedlings of all conifer species and ponderosa pine seedlings individually. This pattern was especially pronounced for well-established seedlings (⩾38cm in height). Graminoids dominated lower elevation sites following wildfire, which may have added to moisture stress for seedlings due to competition for water. These results suggest moisture stress can be a critical factor limiting conifer regeneration following stand-replacing wildfire in dry coniferous forests, with predicted increases in temperature and drought in the coming century likely to increase the importance of moisture stress. Strongly moisture limited forested sites may fail to regenerate for extended periods after stand-replacing disturbance, suggesting these sites are high priorities for management intervention where maintaining forests is a priority.
    Keywords Pinus ; Poaceae ; climate change ; coniferous forests ; conifers ; drought ; dry forests ; ecosystems ; logit analysis ; seedlings ; temperature ; trees ; wildfires ; Oregon
    Language English
    Dates of publication 2013-0815
    Size p. 163-170.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 751138-3
    ISSN 0378-1127
    ISSN 0378-1127
    DOI 10.1016/j.foreco.2013.03.050
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 6026: Show issues

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  2. Article: Early responses to thinning treatments designed to accelerate late successional forest structure in young coniferous stands of western Oregon, USA

    Dodson, Erich Kyle / Adrian Ares / Klaus J. Puettmann

    Canadian journal of forest research =. 2012 Jan. 31, v. 42, no. 2

    2012  

    Abstract: The loss of critical habitat provided by late successional forests has prompted the search for management options that can accelerate the development of late successional forest structure in young stands. We examined operational-scale commercial thinning ...

    Abstract The loss of critical habitat provided by late successional forests has prompted the search for management options that can accelerate the development of late successional forest structure in young stands. We examined operational-scale commercial thinning treatments at seven sites to evaluate if thinning could accelerate development of late successional forest structures in 40–60 year old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) forests. Thinning treatments included an untreated control, high density, moderate density, and variable density retention. All thinning treatments had leave islands, and moderate density and variable density included harvest-created gaps. Thinned units, especially moderate density and variable density, had greater spatial variability in tree density, supported lower live branches, had greater tree regeneration and growth, and had slightly lower mortality relative to the control. Canopy gaps extended the range of stand densities and increased growth of trees immediately along gap edges. However, thinning had little effect on growth of the largest Douglas-fir trees and did little to provide large snags or coarse woody debris. These results suggest that thinning treatments can accelerate some aspects, e.g., spatial variability, of late successional forest structures. Other attributes, such as large trees and snags, may prove less responsive to thinning treatments, at least in the short term. Including tree retention levels lower than typical management applications and formation of canopy gaps provide the wide range of conditions that appears beneficial for developing late successional forest structure.
    Keywords Pseudotsuga menziesii ; branches ; canopy gaps ; coarse woody debris ; forests ; habitats ; mortality ; snags ; trees ; Oregon
    Language English
    Dates of publication 2012-0131
    Size p. 345-355.
    Publishing place NRC Research Press
    Document type Article
    ZDB-ID 1473096-0
    ISSN 1208-6037 ; 0045-5067
    ISSN (online) 1208-6037
    ISSN 0045-5067
    DOI 10.1139/x11-188
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Understory vegetation response to thinning and burning restoration treatments in dry conifer forests of the eastern Cascades, USA

    Dodson, Erich Kyle / Peterson, David W / Harrod, Richy J

    Forest ecology and management. 2008 May 15, v. 255, no. 8-9

    2008  

    Abstract: Restoration/fuel reduction treatments are being widely used in fire-prone forests to modify stand structure, reduce risks of severe wildfire, and increase ecosystem resilience to natural disturbances. These treatments are designed to manipulate stand ... ...

    Abstract Restoration/fuel reduction treatments are being widely used in fire-prone forests to modify stand structure, reduce risks of severe wildfire, and increase ecosystem resilience to natural disturbances. These treatments are designed to manipulate stand structure and fuels, but may also affect understory vegetation and biodiversity. In this study, we describe prescribed fire and thinning treatment effects on understory vegetation species richness, cover, and species composition in dry coniferous forests of central Washington State, U.S.A. We applied thinning and prescribed fire treatments in factorial design to 12 large (10ha) management units, and surveyed understory vegetation before treatment and during the second growing season after treatment completion. Many understory vegetation traits changed significantly during the treatment period, regardless of treatment applied, and changes were often proportional to pre-treatment condition. In general, cover declined and species richness increased during the treatment period. Thinning followed by prescribed fire increased species richness, particularly in areas where species richness was low initially. Thinning alone had a similar, but lesser effect. Forb richness was increased by thinning, and shrub richness was increased by the combined thin/burn treatment, but graminoid richness was unaffected. Exotic cover and richness also increased in the combined thin/burn treatment, although they constituted only a very small portion of the total understory. Understory plant cover was not affected by treatments, but did decline from pre- to post-treatment sampling, with cover losses highest in areas where cover was high prior to treatment. Forb cover increased with thinning followed by burning where forb cover was low initially. Burning reduced graminoid cover with or without thinning. Species composition varied within and among treatment units, but was not strongly or consistently affected by treatments. Our study shows that thinning and burning treatments had mostly neutral to beneficial effects on understory vegetation, with only minor increases in exotic species. However, the pre-treatment condition had strong effects on understory dynamics, and also modified some responses to treatments. The maximum benefit of restoration treatments appears to be where understory richness is low prior to treatment, suggesting restoration efforts might be focused on these areas.
    Keywords coniferous forests ; ecological restoration ; forest thinning ; prescribed burning ; fire hazard reduction ; understory ; species diversity ; dry environmental conditions ; vegetation cover ; Pinus ponderosa ; forest trees ; invasive species ; ecological invasion ; fuels (fire ecology) ; Washington
    Language English
    Dates of publication 2008-0515
    Size p. 3130-3140.
    Publishing place [Amsterdam]: Elsevier Science
    Document type Article
    ZDB-ID 751138-3
    ISSN 0378-1127
    ISSN 0378-1127
    DOI 10.1016/j.foreco.2008.01.026
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 6026: Show issues

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  4. Article ; Online: Reduced fire severity offers near-term buffer to climate-driven declines in conifer resilience across the western United States.

    Davis, Kimberley T / Robles, Marcos D / Kemp, Kerry B / Higuera, Philip E / Chapman, Teresa / Metlen, Kerry L / Peeler, Jamie L / Rodman, Kyle C / Woolley, Travis / Addington, Robert N / Buma, Brian J / Cansler, C Alina / Case, Michael J / Collins, Brandon M / Coop, Jonathan D / Dobrowski, Solomon Z / Gill, Nathan S / Haffey, Collin / Harris, Lucas B /
    Harvey, Brian J / Haugo, Ryan D / Hurteau, Matthew D / Kulakowski, Dominik / Littlefield, Caitlin E / McCauley, Lisa A / Povak, Nicholas / Shive, Kristen L / Smith, Edward / Stevens, Jens T / Stevens-Rumann, Camille S / Taylor, Alan H / Tepley, Alan J / Young, Derek J N / Andrus, Robert A / Battaglia, Mike A / Berkey, Julia K / Busby, Sebastian U / Carlson, Amanda R / Chambers, Marin E / Dodson, Erich Kyle / Donato, Daniel C / Downing, William M / Fornwalt, Paula J / Halofsky, Joshua S / Hoffman, Ashley / Holz, Andrés / Iniguez, Jose M / Krawchuk, Meg A / Kreider, Mark R / Larson, Andrew J / Meigs, Garrett W / Roccaforte, John Paul / Rother, Monica T / Safford, Hugh / Schaedel, Michael / Sibold, Jason S / Singleton, Megan P / Turner, Monica G / Urza, Alexandra K / Clark-Wolf, Kyra D / Yocom, Larissa / Fontaine, Joseph B / Campbell, John L

    Proceedings of the National Academy of Sciences of the United States of America

    2023  Volume 120, Issue 11, Page(s) e2208120120

    Abstract: Increasing fire severity and warmer, drier postfire conditions are making forests in the western United States (West) vulnerable to ecological transformation. Yet, the relative importance of and interactions between these drivers of forest change remain ... ...

    Abstract Increasing fire severity and warmer, drier postfire conditions are making forests in the western United States (West) vulnerable to ecological transformation. Yet, the relative importance of and interactions between these drivers of forest change remain unresolved, particularly over upcoming decades. Here, we assess how the interactive impacts of changing climate and wildfire activity influenced conifer regeneration after 334 wildfires, using a dataset of postfire conifer regeneration from 10,230 field plots. Our findings highlight declining regeneration capacity across the West over the past four decades for the eight dominant conifer species studied. Postfire regeneration is sensitive to high-severity fire, which limits seed availability, and postfire climate, which influences seedling establishment. In the near-term, projected differences in recruitment probability between low- and high-severity fire scenarios were larger than projected climate change impacts for most species, suggesting that reductions in fire severity, and resultant impacts on seed availability, could partially offset expected climate-driven declines in postfire regeneration. Across 40 to 42% of the study area, we project postfire conifer regeneration to be likely following low-severity but not high-severity fire under future climate scenarios (2031 to 2050). However, increasingly warm, dry climate conditions are projected to eventually outweigh the influence of fire severity and seed availability. The percent of the study area considered unlikely to experience conifer regeneration, regardless of fire severity, increased from 5% in 1981 to 2000 to 26 to 31% by mid-century, highlighting a limited time window over which management actions that reduce fire severity may effectively support postfire conifer regeneration.
    MeSH term(s) Fires ; Wildfires ; Climate ; Climate Change ; Tracheophyta
    Language English
    Publishing date 2023-03-06
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2208120120
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1148: Show issues Location:
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  5. Article: Early responses to thinning treatments designed to accelerate late successional forest structure in young coniferous stands of western Oregon, USA

    Dodson, Erich Kyle / Adrian Ares / Klaus J. Puettmann

    Canadian journal of forest research =

    Volume v. 42,, Issue no. 2

    Abstract: The loss of critical habitat provided by late successional forests has prompted the search for management options that can accelerate the development of late successional forest structure in young stands. We examined operational-scale commercial thinning ...

    Abstract The loss of critical habitat provided by late successional forests has prompted the search for management options that can accelerate the development of late successional forest structure in young stands. We examined operational-scale commercial thinning treatments at seven sites to evaluate if thinning could accelerate development of late successional forest structures in 40–60 year old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) forests. Thinning treatments included an untreated control, high density, moderate density, and variable density retention. All thinning treatments had leave islands, and moderate density and variable density included harvest-created gaps. Thinned units, especially moderate density and variable density, had greater spatial variability in tree density, supported lower live branches, had greater tree regeneration and growth, and had slightly lower mortality relative to the control. Canopy gaps extended the range of stand densities and increased growth of trees immediately along gap edges. However, thinning had little effect on growth of the largest Douglas-fir trees and did little to provide large snags or coarse woody debris. These results suggest that thinning treatments can accelerate some aspects, e.g., spatial variability, of late successional forest structures. Other attributes, such as large trees and snags, may prove less responsive to thinning treatments, at least in the short term. Including tree retention levels lower than typical management applications and formation of canopy gaps provide the wide range of conditions that appears beneficial for developing late successional forest structure.
    Language English
    Document type Article
    ISSN 1208-6037
    Database AGRIS - International Information System for the Agricultural Sciences and Technology

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    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

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    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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