DOI: 10.1016/j.foreco.2016.07.014
Scopus记录号: 2-s2.0-84982850679
论文题名: Pruning high-value Douglas-fir can reduce dwarf mistletoe severity and increase longevity in Central Oregon
作者: Maffei H.M. ; Filip G.M. ; Grulke N.E. ; Oblinger B.W. ; Margolis E.Q. ; Chadwick K.L.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 379 起始页码: 11
结束页码: 19
语种: 英语
英文关键词: Arceuthobium douglasii
; Normalized Difference Vegetation Index (NDVI)
; Oregon
; Pruning
; Pseudotsuga menziesii var. menziesii
; Tree rings
Scopus关键词: Fading (radio)
; Spectroscopy
; Value engineering
; Vegetation
; Arceuthobium douglasii
; Normalized difference vegetation index
; Oregon
; Pruning
; Pseudotsuga menziesii
; Tree rings
; Forestry
; biomechanics
; comparative study
; coniferous tree
; disease severity
; growth
; longevity
; multispectral image
; NDVI
; parasitic disease
; parasitic plant
; pruning
; tree ring
; Oregon
; United States
; Arceuthobium douglasii
; Arceuthobium pusillum
; Pseudotsuga
; Pseudotsuga menziesii
; Pseudotsuga menziesii var. menziesii
英文摘要: Mid- to very large-sized Douglas-fir (Pseudotsuga menzieseii var. menziesii) that were lightly- to moderately-infected by dwarf mistletoe (Arceuthobium douglasii) were analyzed over a 14-year period to evaluate whether mechanical pruning could eradicate mistletoe (or at least delay the onset of severe infection) without significantly affecting tree vitality and by inference, longevity. Immediate and long-term pruning effects on mistletoe infection severity were assessed by comparing pruned trees (n = 173) to unpruned trees (n = 55) with respect to: (1) percentage of trees with no visible infections 14 years post-pruning, (2) Broom Volume Rating (BVR), and (3) rate of BVR increase 14 years post-pruning. Vitality/longevity (compared with unpruned trees) was assessed using six indicators: (1) tree survival, (2) the development of severe infections, (3) the development of dead tops, (4) tree-ring width indices, (5) Normalized Difference Vegetation Index (NDVI) from high-resolution multi-spectral imagery, and (6) live-crown ratio (LCR) and increment. Twenty-four percent of the pruned trees remained free of mistletoe 14 years post-pruning. Pruning is most likely to successfully eradicate mistletoe in lightly infected trees (BVR 1 or 2) without infected neighbors. Pruning significantly decreased mean BVR in the pruned versus the unpruned trees. However, the subsequent average rate of intensification (1.3–1.5 BVR per decade) was not affected, implying that a single pruning provides ∼14 years respite in the progression of infection levels. Post-pruning infection intensification was slower on dominant and co-dominants than on intermediate or suppressed trees. The success of mistletoe eradication via pruning and need for follow-up pruning should be evaluated no sooner than 14 years after pruning to allow for the development of detectable brooms. Based on six indicators, foliage from witches brooms contribute little to long-term tree vitality since removal appears to have little effect on resources available for tree growth and maintenance. In the severely pruned trees, tree-ring width was reduced for several years post-pruning, but then compensated with larger ring width in later years. Both NDVI and LCR increment were significantly higher for the pruned trees than the control trees, while the development of severe infections and/or dead tops was significantly (5× and 3×) higher for the controls. If possible, multiple indicators of tree vitality should be evaluated. Pruning can be worthwhile even if all the mistletoe is not removed, because mistletoe intensification is delayed. The impact of removing the brooms seems to be minimal, and post-pruning crowns had greater NDVI values. © 2016 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64727
Appears in Collections: 影响、适应和脆弱性
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作者单位: USDA Forest Service, 63095 Deschutes Market Rd, Bend, OR, United States; USDA Forest Service, Pacific Northwest Regional Office, 1220 SW Third Ave, Portland, OR, United States; USDA Forest Service, Western Wildland Environmental Threat Assessment Center, 3160 NE 3rd Street, Prineville, OR, United States; U.S. Geological Survey, Fort Collins Science Center, Jemez Mountains Field Station, 301 Dinosaur Trail, Santa Fe, New Mexico, United States; USDA Forest Service, 16400 Champion Way, Sandy, OR, United States
Recommended Citation:
Maffei H.M.,Filip G.M.,Grulke N.E.,et al. Pruning high-value Douglas-fir can reduce dwarf mistletoe severity and increase longevity in Central Oregon[J]. Forest Ecology and Management,2016-01-01,379