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Titre du document / Document title

Climate change and impacts of boreal forest insects

Auteur(s) / Author(s)

VOLNEY W. Jan A. (1) ; FLEMING Richard A. (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Natural Resources Canada, Canadian Forest Service, Northern Forestry Centre, 5320-122 St., Edmonton, Alta., T6H 3S5, CANADA
(2) Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, Sault Sainte Marie, Ont., P6A 5M7, CANADA

Résumé / Abstract

The circum-polar boreal forest has played an important role in the wealth of northern nations since the 15th century. Its natural resources spurred strategic geopolitical developments beginning in the 16th century but intense development of the boreal forest is largely limited to the 20th century. Insects cause considerable loss of wood that has an adverse effect on the balance of carbon sequestered by forests. Current understanding of processes that lead to stand-replacing outbreaks in three insect species is reviewed in this paper. Many of these processes depend on climate either directly, such as reduced survival with extreme weather events, or indirectly, mainly through effects on the host trees. In the boreal zone of Canada, pest-caused timber losses may be as much as 1.3-2.0 times the mean annual depletions due to fires. Pests are thus major, but consistently overlooked forest ecosystem components that have manifold consequences to the structure and functions of future forests. Global change will have demonstrable changes in the frequency and intensity of pest outbreaks, particularly at the margins of host ranges. The consequent shunting of carbon back to the atmosphere rather than to sequestration in forests as biomass is thought to have positive feedback to global warming. Whereas significant progress has been made in developing carbon budget models for the boreal forests of Canada, enormous problems remain in incorporating pest effects in these models. These problems have their origins in the nature of interactions among pests with forest productivity, and problems with scaling. The common problems of verification and validation of model results are particularly troublesome in projecting future forest productivity. The interaction of insects with fires must be accounted for if realistic carbon sequestration forecasts in a warming climate are to be made. These problems make assessments of mitigation and adaptation of pest management alternatives difficult to evaluate at present. Nevertheless, the impacts of stand-replacing insect population outbreaks is important in formulating future resource management policy.

Revue / Journal Title

Agriculture, ecosystems & environment    ISSN  0167-8809   CODEN AEENDO 

Source / Source

Congrès
GCTE Focus 3 Conference, Reading , ROYAUME-UNI (09/1999)
2000, vol. 82, no 1-3 (397 p.)  (2 p.1/4), [Notes: Selected papers], pp. 283-294

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Oxford, ROYAUME-UNI  (1983) (Revue)

Mots-clés anglais / English Keywords

Climate modification

;

Environment impact

;

Infestation

;

Review

;

Animal plant relation

;

Outbreak

;

Taiga

;

Vegetation dynamics

;

Forest stand

;

Choristoneura fumiferana

;

Choristoneura pinus

;

Malacosoma disstria

;

Tortricidae

;

Lepidoptera

;

Insecta

;

Arthropoda

;

Invertebrata

;

Lasiocampidae

;

Environmental factor

;

Pest

;

Mots-clés français / French Keywords

Modification climat

;

Impact environnement

;

Infestation

;

Article synthèse

;

Relation animal végétal

;

Pullulation

;

Taïga

;

Dynamique végétation

;

Peuplement forestier

;

Choristoneura fumiferana

;

Choristoneura pinus

;

Malacosoma disstria

;

Tortricidae

;

Lepidoptera

;

Insecta

;

Arthropoda

;

Invertebrata

;

Lasiocampidae

;

Facteur milieu

;

Déprédateur

;

Mots-clés espagnols / Spanish Keywords

Modificación clima

;

Impacto medio ambiente

;

Infestación

;

Artículo síntesis

;

Relación animal vegetal

;

Pululación

;

Taiga

;

Dinámica vegetación

;

Rodal forestal

;

Choristoneura fumiferana

;

Choristoneura pinus

;

Malacosoma disstria

;

Tortricidae

;

Lepidoptera

;

Insecta

;

Arthropoda

;

Invertebrata

;

Lasiocampidae

;

Factor medio

;

Plaga

;

Localisation / Location

INIST-CNRS, Cote INIST : 16535, 35400009368508.0210

Nº notice refdoc (ud4) : 854292



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