气候变化领域集成服务门户(CCPortal): Liberation of future crop trees from lianas in Belize: Completeness, costs, and timber-yield benefits

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DOI	10.1016/j.foreco.2019.02.023
	Liberation of future crop trees from lianas in Belize: Completeness, costs, and timber-yield benefits
	Mills D.J.; Bohlman S.A.; Putz F.E.; Andreu M.G.
发表日期	2019
ISSN	0378-1127
起始页码	97
结束页码	104
卷号	439
英文摘要	Lianas (woody climbing plants) often abound in tropical forests after selective logging and other disturbances. Liana cutting is an often-prescribed but seldom applied silvicultural treatment designed to foster the growth of future crop trees (hereafter: FCTs). Small-scale studies indicate that this treatment is effective, but little is known about its efficiency (i.e., proportions of lianas missed) or financial cost effectiveness at operational scales. To fill these gaps, we worked in a commercial forest concession in Belize where FCTs and trees to be felled were liberated from lianas in 500–1000 ha annual timber harvest blocks. We found that field crews assigned this and inventory-related tasks spent 11.8% of their time cutting lianas from FCTs at a cost of $0.11 per tree. Workers failed to cut 31.9% of the lianas that infested the 701 FCTs they were supposed to liberate; most of the missed lianas grew into the FCT crowns from neighbors or hung down far from the bole [an additional 48 FCTs (6%) were completely missed]. In a logging block treated 9-years prior to this study, 39% of the liberated Swietenia macrophylla FCTs 29–56 cm DBH were still liana-free whereas in an untreated stand, 94% of similar-sized conspecific control FCTs were liana-infested. Based on tree ring data for the same 9-year period, the liberated FCTs grew 38–63% faster than control FCTs. If the mean growth benefit is sustained over the entire 40-year cutting cycle, each liberated FCT will yield an average of 1.51 m 3 (639 board feet) more roundwood than comparable FCTs in unliberated forest. Over this 40-year period with an annual discount rate of 4.5%, this added volume gives the $0.11 investment per tree a net present value of US $161.38 and a profitability index of 1467 for export quality timber. These results argue for the application of this inexpensive and effective treatment in managed forests where lianas abound. © 2019 Elsevier B.V.
英文关键词	Broadleaf deciduous forest; Mahogany; Reduced-impact logging; Silvicultural treatments; Sustainable forest management; Swietenia macrophylla; Time-and-motion study; Tropical forestry
语种	英语
scopus关键词	Cost effectiveness; Crops; Logging (forestry); Timber; Broadleaf deciduous forests; Mahogany; Reduced-impact logging; Silvicultural treatments; Sustainable forest management; Swietenia macrophylla; Time and motion study; broad-leaved forest; conspecific; cost analysis; deciduous forest; discount rate; disturbance; forest inventory; future prospect; growth; harvesting; investment; selective logging; silviculture; sustainable forestry; timber; tree ring; tropical forest; vine; woody plant; Control Systems; Cost Effectiveness; Cutting; Farm Crops; Processing; Sustainable Forest Management; Swietenia; Trees; Belize [Central America]; Swietenia; Swietenia macrophylla
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156092
作者单位	School of Forest Resources and Conservation, University of Florida, Gainesville, FL 32611, United States; Smithsonian Tropical Research Institute, Apartado 0843–03092, Balboa, Ancon, Panama; Department of Biology, University of Florida, Gainesville, FL 32611-8526, United States
推荐引用方式 GB/T 7714	Mills D.J.,Bohlman S.A.,Putz F.E.,et al. Liberation of future crop trees from lianas in Belize: Completeness, costs, and timber-yield benefits[J],2019,439.
APA	Mills D.J.,Bohlman S.A.,Putz F.E.,&Andreu M.G..(2019).Liberation of future crop trees from lianas in Belize: Completeness, costs, and timber-yield benefits.Forest Ecology and Management,439.
MLA	Mills D.J.,et al."Liberation of future crop trees from lianas in Belize: Completeness, costs, and timber-yield benefits".Forest Ecology and Management 439(2019).