Changes in Transpiration and Leaf Water Potential in Douglas-Fir Trees following Douglas-Fir Beetle Attack and Mechanical Girdling

被引:1
|
作者
Mercado, Javier E. [1 ]
Walker, Robert T. [2 ]
Franklin, Scott [3 ]
Kay, Shannon L. [1 ]
Gomez, Susana Karen [3 ]
Hubbard, Robert M. [1 ]
机构
[1] USDA, FS Rocky Mt Res Stn, Ft Collins, CO 80526 USA
[2] Boulder Valley & Longmont Conservat Dist, Longmont, CO 80501 USA
[3] Univ Northern, Sch Biol Sci, Greeley, CO 80639 USA
来源
FORESTS | 2021年 / 12卷 / 12期
关键词
transpiration decline; tree physiological response; phytopathogenic fungi; irruptive bark beetles; tree defense; DENDROCTONUS-PSEUDOTSUGAE HOPKINS; MOUNTAIN PINE-BEETLE; BLUE-STAIN FUNGI; LODGEPOLE PINE; OUTBREAK; SCOLYTIDAE; COLEOPTERA; DENSITY; GROWTH; STAND;
D O I
10.3390/f12121722
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Bark beetles and their associated fungi kill trees readily, but we often ignore which organism is the leading cause of tree mortality. While phloem feeding beetles inhibit photosynthate transport, their associated fungi block the tracheids disrupting transpiration. Within the family Pinaceae, knowledge of tree physiological decline following bark beetle and associated fungi colonization is limited to the genus Pinus. Here we investigate the physiological response of Pseudotsuga (P. menziesii) to bark beetles or its fungi. We hypothesized that fungi block water transport in Douglas-fir causing faster mortality than by bark beetle activity alone. We successfully lured Douglas-fir beetle to attack a subset of trees in our experimental area using pheromones and compared Beetle-Killed trees with mechanically Girdled, and Control trees. During spring snowmelt, nine months after treatments were applied, Control, Girdled, and five trees that Survived beetle attack had higher transpiration rates and less negative pre-dawn water potential than five Beetle-Killed trees. Declines in transpiration and leaf water potential in our Beetle-Killed trees occurred much earlier than those in studies of beetle-attacked lodgepole pines, suggesting stronger defensive traits in Douglas-fir. Our data suggest that, as in pines, bark beetle-associated fungi are the leading cause of mortality in Douglas-fir beetle-attacked trees.
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页数:10
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