DOI: 10.1016/j.foreco.2015.06.015
Scopus记录号: 2-s2.0-84945458323
论文题名: Productivity and thinning effects in hybrid aspen root sucker stands
作者: Mc Carthy R. ; Rytter L.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 354 起始页码: 215
结束页码: 223
语种: 英语
英文关键词: Biomass production
; Growth dynamic
; P. tremula×P. tremuloides
; Root sprouting
; Thinning strategies
; Vegetative regeneration
Scopus关键词: Biomass
; Carbon
; Forestry
; Harvesting
; Planning
; Reforestation
; Biomass productions
; Growth dynamics
; Root sprouting
; Thinning strategies
; Vegetative regeneration
; Ecology
; bioenergy
; biomass
; canopy architecture
; forest dynamics
; harvesting
; regeneration
; root
; shoot
; spatiotemporal analysis
; thinning
; Scandinavia
英文摘要: The Nordic countries have a vision to become carbon neutral by 2050. One way to approach this vision is to cultivate and harvest fast-growing tree species as bioenergy.In three study parts, this paper investigated how hybrid aspen performs in the second generation of root suckers. The three studies investigated; (1) initial growth, (2) growth effects following three early thinning strategies, and (3) individual tree development after the three early thinning strategies in study 2 and an intensive low thinning. In study 1, root suckers between 1- and 4-years-old were studied at four sites. Studies 2 and 3 followed growth dynamics for 12. years at one site.After 2years, the four sites in study 1 had a mean stand density of 63,500 living root sucker stems ha-1 (ranged 46,800-72,900 stems ha-1) and the mean standing biomass (including living and dead stems) was 14.5Mg dry weight ha-1 (ranged 9.1-21.7Mg dry weight ha-1). Differences between sites were observed.Even though significant amounts of biomass had been harvested after 2years in two of the treatments in study 2, the density of living stems did no longer differ between the treatments at the end of the 12-year period. The stem diameter was largest for cross-corridor thinning, while the height development was not affected by thinning strategy. During the 12-year period, the obtainable biomass (included living, dead and harvested biomass) did not differ significantly among the thinning treatments and after 12years the mean annual increment was 9.8Mg dry weight ha-1yr-1 and had started to decrease.Results following the second thinning in study 3 showed that early biomass harvest had a large influence on the development of individual stems. Unthinned strategy resulted in smaller stem diameters and green crowns, while cross-corridor thinning showed the largest stem dimensions and green crowns. Green crowns became of similar size for the various thinning strategies, but the difference in stem diameter remained and the mean annual increment continued to diverge.This paper showed that the second generation of hybrid aspen can contribute significantly to the biomass supply, and that the strength of early thinning has a large effect on the continuing growth. The importance of early thinning, when striving for large fast-growing trees, is highlighted. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65307
Appears in Collections: 影响、适应和脆弱性
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作者单位: Skogforsk, The Forestry Research Institute of Sweden, Ekebo 2250, Svalöv, Sweden; Swedish University of Agricultural Sciences, SLU, Southern Swedish Forest Research Centre, P.O. Box 49, Alnarp, Sweden
Recommended Citation:
Mc Carthy R.,Rytter L.. Productivity and thinning effects in hybrid aspen root sucker stands[J]. Forest Ecology and Management,2015-01-01,354