DOI: 10.1016/j.foreco.2012.09.028
Scopus记录号: 2-s2.0-84870213019
论文题名: Changes in transpiration and foliage growth in lodgepole pine trees following mountain pine beetle attack and mechanical girdling
作者: Hubbard R.M. ; Rhoades C.C. ; Elder K. ; Negron J.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2013
卷: 289 起始页码: 312
结束页码: 317
语种: 英语
英文关键词: Blue stain fungi
; Dendroctonus ponderosae
; Phloem
; Pinus contorta
; Sap flow
Scopus关键词: Blue stain
; Dendroctonus ponderosae
; Phloem
; Pinus contorta
; Sap flow
; Cardiovascular system
; Fungi
; Transpiration
; Water supply
; Forestry
; beetle
; coniferous forest
; foliage
; forest ecosystem
; fungus
; growth rate
; mortality
; nutrient cycling
; pest outbreak
; phloem
; population decline
; sap flow
; transpiration
; vascular plant
; water uptake
; Ecosystems
; Foliar Analysis
; Fungi
; Girdling
; Insects
; Pinus Contorta
; Transpiration
; Water Supply
; Coleoptera
; Dendroctonus ponderosae
; Fungi
; Hexapoda
; Pinus contorta
; Pinus mugo
; Scolytinae
英文摘要: The recent mountain pine beetle outbreak in North American lodgepole pine forests demonstrates the importance of insect related disturbances in changing forest structure and ecosystem processes. Phloem feeding by beetles disrupts transport of photosynthate from tree canopies and fungi introduced to the tree's vascular system by the bark beetles inhibit water transport from roots to canopy; the implications of these processes for tree mortality are poorly understood. We hypothesized that the fungus must quickly disrupt tree water relations because phloem girdling, reported in other studies, requires much longer than a year to cause mortality. We tested the hypothesis in lodgepole pine (Pinus contorta) by comparing tree water use, foliar expansion and seasonal variation in predawn water potential on 8 mechanically girdled trees, 10 control trees and 17 trees attacked by mountain pine beetle (Dendroctonous ponderosae). Transpiration began to decline within ten days of beetle infestation; two months later, pre-dawn water potential had also dropped significantly as water transport to the canopy declined by 60% relative to healthy trees. There was no water transport or foliar expansion by beetle-infested trees the following year. Experimentally girdled trees continued to transpire, maintain leaf water potential and grow new foliage similar to healthy trees. Our data suggest that fungi introduced by bark beetles in this study are the primary cause of tree mortality following mountain pine beetle attack and significantly reduce transpiration soon after beetle infestation. Rapid decline and the eventual cessation of water uptake by infected trees have important implications for water and nutrient cycling in beetle impacted forests. © 2012.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66815
Appears in Collections: 影响、适应和脆弱性
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作者单位: USDA Forest Service, Rocky Mountain Research Station, 240 West Prospect Road, Fort Collins, CO 80526, United States
Recommended Citation:
Hubbard R.M.,Rhoades C.C.,Elder K.,et al. Changes in transpiration and foliage growth in lodgepole pine trees following mountain pine beetle attack and mechanical girdling[J]. Forest Ecology and Management,2013-01-01,289