DOI: 10.1016/j.foreco.2017.02.029
Scopus记录号: 2-s2.0-85014751062
论文题名: Precommercial release thinning of potential Acacia koa crop trees increases stem and crown growth in dense, 8-year-old stands in Hawaii
作者: Idol T.W. ; Morales R.M. ; Friday J.B. ; Scowcroft P.G.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 392 起始页码: 105
结束页码: 114
语种: 英语
英文关键词: Acacia koa
; Crop tree release
; Herbicide
; Phosphorus fertilization
; Precommercial thinning
; Silviculture
Scopus关键词: Crops
; Ecology
; Herbicides
; Phosphorus
; Reforestation
; Satellite imagery
; Spectrum analysis
; Weed control
; Above ground biomass
; Acacia koa
; Atmospherically resistant vegetation indices
; Crop tree release
; Herbaceous weed control
; High resolution satellite imagery
; Pre-commercial thinning
; Silviculture
; Forestry
; Acacia koa
英文摘要: An 8-year-old dense monotypic stand of naturally regenerated koa (Acacia koa A. Gray) on the Island of Hawaii was selected to determine the effects of precommercial release thinning, phosphorous (P) fertilization and herbaceous weed control on growth of potential crop trees over approximately 30 months. Thinning consisted of cutting down all stems within a 4.5-m radius of the crop tree. Phosphorus was added at a rate of 300 kg ha−1 over two years. Herbaceous weeds were sprayed once with imazapyr, a broad-spectrum herbicide. Thinning alone or in combination with P fertilization significantly increased stem diameter increment and allometric estimates of the growth of leaf area and aboveground biomass. There was no significant increase in stem diameter, leaf area or biomass in the absence of thinning. Within the thinned treatment, P fertilization resulted in significant increases in tree height over time. Herbaceous weed control had no effect on tree growth. The atmospherically resistant vegetation index (ARVI), which was derived from spectral analyses of high-resolution satellite imagery (GeoEye1), was significantly higher for thinned than unthinned trees 25 months after study initiation, suggesting greater light absorbance and a possible explanation for overall greater growth of thinned trees. When considered with results from previous studies, these findings indicated that crop tree selection and precommercial release thinning in dense, even-aged koa stands should be done early in stand development to prevent loss of crown vigor and growth potential. Additional interventions like P fertilization or herbaceous weed control may not be necessary until trees are older or site conditions suggest important soil resource limitations. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64380
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Natural Resources and Environmental Management, University of Hawaii-Manoa, 1910 East West Rd, Honolulu, HI, United States; Invasive Species Coordinator, Yavapai-Apache Indian Nation, 1452 E. Stage Way, Cottonwood, AZ, United States; Institute of Pacific Islands Forestry, Pacific Southwest Research Station, United States Department of Agriculture, Forest Service, 60 Nowelo Street, Hilo, HI, United States
Recommended Citation:
Idol T.W.,Morales R.M.,Friday J.B.,et al. Precommercial release thinning of potential Acacia koa crop trees increases stem and crown growth in dense, 8-year-old stands in Hawaii[J]. Forest Ecology and Management,2017-01-01,392