NDLI: Modelling Spatial Interactions Among Fire, Spruce Budworm, and Logging in the Boreal Forest

Content Provider	Springer Nature Link
Author	James, Patrick M. A. Fortin, M. J. Sturtevant, B. R. Fall, A. Kneeshaw, D.
Copyright Year	2010
Abstract	In the boreal forest, fire, insects, and logging all affect spatial patterns in forest age and species composition. In turn, spatial legacies in age and composition can facilitate or constrain further disturbances and have important consequences for forest spatial structure and sustainability. However, the complex three-way interactions among fire, insects, and logging and their combined effects on forest spatial structure have seldom been investigated. We used a spatially explicit landscape simulation model to examine these interactions. Specifically, we investigated how the amount and the spatial scale of logging (cutblock size) in combination with succession, fire, and spruce budworm outbreaks affect area burned and area defoliated. Simulations included 30 replicates of 300 years for each of 19 different disturbance scenarios. More disturbances increased both the fragmentation and the proportion of coniferous species and imposed additional constraints on the extent of each disturbance. We also found that harvesting legacies affect fire and budworm differently due to differences in forest types consumed by each disturbance. Contrary to expectation, budworm defoliation did not affect area burned at the temporal scales studied and neither amount of logging nor cutblock size influenced defoliation extent. Logging increased fire size through conversion of more of the landscape to early seral, highly flammable forest types. Although logging increased the amount of budworm host species, spruce budworm caused mortality was reduced due to reductions in forest age. In general, we found that spatial legacies do not influence all disturbances equally and the duration of a spatial legacy is limited when multiple disturbances are present. Further information on post-disturbance succession is still needed to refine our understanding of long-term disturbance interactions.
Starting Page	60
Ending Page	75
Page Count	16
File Format	PDF
ISSN	14329840
Journal	Ecosystems
Volume Number	14
Issue Number	1
e-ISSN	14350629
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-11-23
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	dynamic feedbacks forest management landscape legacies forest disturbance spatial modelling landscape pattern metrics Nature Conservation Geoecology/Natural Processes Environmental Management Zoology Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry Ecology, Evolution, Behavior and Systematics

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