DOI: 10.1016/j.foreco.2014.05.020
Scopus记录号: 2-s2.0-84901922085
论文题名: Spatial variability of spruce budworm defoliation at different scales
作者: Zhao K. ; MacLean D.A. ; Hennigar C.R.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 328 起始页码: 10
结束页码: 19
语种: 英语
英文关键词: Cell size
; Cluster analysis
; Decision support system
; Defoliation pattern
; Variability
Scopus关键词: Artificial intelligence
; Cells
; Cluster analysis
; Decision support systems
; Surveys
; Cell size
; Choristoneura fumiferana
; Defoliation pattern
; Impact analysis
; Management decisions
; Salvage treatment
; Spatial variability
; Variability
; Cytology
; aerial survey
; cluster analysis
; defoliation
; pest damage
; pest outbreak
; pest species
; spatial variation
; tree
; Canada
; New Brunswick
英文摘要: Aerial survey records of defoliation by spruce budworm ( Choristoneura fumiferana (Clem.)) in New Brunswick, Canada taken annually from 1965 to 1992, were analyzed at four scales (66. ×. 66. km, 10. ×. 10. km, 2. ×. 2. km, 1. ×. 1. km) to determine patterns and spatial variability of defoliation. Spruce budworm defoliated 92% of the 7.4 million ha study area in at least one year. Cluster analysis was used to group similar defoliation patterns, and 51% of the variation in the 28-year record was described by 28 representative defoliation patterns, at 1. ×. 1. km cell size. Individual defoliation patterns were grouped into five spruce budworm outbreak classes (termed A-E), which each covered 12-27% of the area. These differed substantially in defoliation duration and severity: classes A-B had only 1-3. years of moderate-severe defoliation and 42-75% cumulative defoliation; class C had 8. years and 127% cumulative defoliation; and classes D-E had 13-16. years and 170-208% cumulative defoliation. Given the degree of 'averaging out' of high defoliation occurrences that cause the largest impacts, larger 10. ×. 10. km and 66. ×. 66. km cells were inappropriate for impact analysis. Defoliation variability was highest at 20-60% mean defoliation than at lower or higher defoliation levels. Distributions of area in each class in 1. ×. 1. km cells for 66. ×. 66. km areas throughout the province showed that with the exception of several small coastal areas, four or five of the above outbreak classes occurred in all areas. The wide variation in spruce budworm outbreak patterns is important in making management decisions that differentiate insecticide or salvage treatments based on defoliation severity, and emphasizes the importance of accurate annual aerial survey or remote sensing-based defoliation assessment. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65848
Appears in Collections: 影响、适应和脆弱性
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作者单位: University of New Brunswick, Faculty of Forestry and Environmental Management, P.O. Box 4400, Fredericton, N.B. E3B 5A3, Canada
Recommended Citation:
Zhao K.,MacLean D.A.,Hennigar C.R.. Spatial variability of spruce budworm defoliation at different scales[J]. Forest Ecology and Management,2014-01-01,328