Effects of Climate Change on Forest Vegetation in the Northern Rockies

Robert E. Keane, Mary Frances Mahalovich, Barry L. Bollenbacher, Mary E. Manning, Rachel A. Loehman, Terrie B. Jain, Lisa M. Holsinger, Andrew J. Larson

    Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

    Abstract

    Increasing air temperature, through its influence on soil moisture, is expected to cause gradual changes in the abundance and distribution of tree, shrub, and grass species throughout the Northern Rockies, with drought tolerant species becoming more competitive. The earliest changes will be at ecotones between lifeforms (e.g., upper and lower treelines). Ecological disturbance, including wildfire and insect outbreaks, will be the primary facilitator of vegetation change, and future forest landscapes may be dominated by younger age classes and smaller trees. High-elevation forests will be especially vulnerable if disturbance frequency increases significantly. Increased abundance and distribution of non-native plant species, as well as the legacy of past land uses, create additional stress for regeneration of native forest species. Most strategies for conserving native tree, shrub, and grassland systems focus on increasing resilience to chronic low soil moisture, and to more frequent and extensive ecological disturbance. These strategies generally include managing landscapes to reduce the severity and patch size of disturbances, encouraging fire to play a more natural role, and protecting refugia where fire-sensitive species can persist. Increasing species, genetic, and landscape diversity (spatial pattern, structure) is an important “hedge your bets” strategy that will reduce the risk of major forest loss. Adaptation tactics include using silvicultural prescriptions (especially stand density management) and fuel treatments to reduce fuel continuity, reducing populations of nonnative species, potentially using multiple genotypes in reforestation, and revising grazing policies and practices. Rare and disjunct species and communities (e.g., whitebark pine, quaking aspen) require adaptation strategies and tactics focused on encouraging regeneration, preventing damage from disturbance, and establishing refugia.

    Original languageEnglish
    Title of host publicationAdvances in Global Change Research
    PublisherSpringer International Publishing
    Pages59-95
    Number of pages37
    DOIs
    StatePublished - 2018

    Publication series

    NameAdvances in Global Change Research
    Volume63
    ISSN (Print)1574-0919
    ISSN (Electronic)2215-1621

    Keywords

    • Adaptation strategies and tactics
    • Climate change vulnerabilities
    • Conifer forests
    • Cottonwood
    • Douglas-fir
    • Forest productivity
    • Grand fir
    • Green ash
    • Limber pine
    • Lodgepole pine
    • Ponderosa pine
    • Western red cedar
    • Western white pine
    • Whitebark pine

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