DOI: 10.1016/j.foreco.2017.04.030
Scopus记录号: 2-s2.0-85018352159
论文题名: Post-thinning density and fertilization affect Pinus taeda stand and individual tree growth
作者: Albaugh T.J. ; Fox T.R. ; Rubilar R.A. ; Cook R.L. ; Amateis R.L. ; Burkhart H.E.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 396 起始页码: 207
结束页码: 216
语种: 英语
英文关键词: Increment
; Loblolly pine
; Nitrogen
; Phosphorus
Scopus关键词: Economic and social effects
; Nitrogen
; Phosphorus
; Diameter increment
; Increment
; Loblolly pine
; Nitrogen and phosphorus
; Process-based modeling
; Stand basal area
; Treatment effects
; Volume increment
; Forestry
; Pinus taeda
英文摘要: We installed a thinning and fertilization study at five sites in mid-rotation Pinus taeda L. stands in the southeastern United States to examine treatment effects on diameter growth, basal area production, and volume increment. The treatments were four levels of post-thinning stand density (247, 494, 741 and 1235 stems ha−1) and two levels of fertilization (none and 224 and 28 kg ha−1 of elemental nitrogen and phosphorus, respectively), applied in four replications at each site using either a randomized complete block (3 sites) or a split plot (2 sites) design. Six years after treatment, thinning significantly increased diameter and diameter increment as the residual density level decreased and increased stand basal area, stand basal area increment, stand volume and stand volume increment as residual density level increased at all sites. Fertilizer significantly increased diameter and stand basal area increments at two sites and stand volume increment at one site; these sites had low initial leaf area index, a metric commonly used to assess the potential for response to fertilization. Diameter increment increased as initial diameter class increased. Larger trees grew faster than smaller trees at all sites and for all treatments. Diameter growth decreased as initial stand basal area increased, and fertilization significantly increased diameter growth for a given level of initial stand basal area at sites where fertilization affected diameter growth. Stand volume increment increased as diameter increment increased for crop trees (largest 247 stems ha−1), whereas stand volume increment decreased as diameter increment increased for all trees. The stand-scale ‘cost’ for greater individual-tree diameter growth was a reduction in stand volume increment in the 247 stems ha−1 treatment; this reduction was 13 m3 ha−1 yr−1 across all sites compared with the 1235 stems ha−1 treatment, whereas the individual tree diameter growth ‘benefit’ was 0.9 cm yr−1 when comparing these same treatments. Trade-offs were quantified between individual tree size and stand growth across the thinning and fertilization levels imposed in this study, which will be useful in empirical and process-based modeling efforts for predicting thinning and fertilization responses of P. taeda. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64338
Appears in Collections: 影响、适应和脆弱性
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作者单位: Virginia Tech Department of Forest Resources and Environmental Conservation, 228 Cheatham Hall, Blacksburg, VA, United States; Cooperativa de Productividad Forestal. Facultad de Ciencias Forestales, Universidad de Concepción., Victoria 631, Casilla 160-C, Concepción, Chile; Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC, United States
Recommended Citation:
Albaugh T.J.,Fox T.R.,Rubilar R.A.,et al. Post-thinning density and fertilization affect Pinus taeda stand and individual tree growth[J]. Forest Ecology and Management,2017-01-01,396