DOI: 10.1016/j.foreco.2013.07.058
Scopus记录号: 2-s2.0-84883021963
论文题名: Management and productivity of cedar-hemlock-salal scrub forests on the north coast of british columbia
作者: Kranabetter J.M. ; LePage P. ; Banner A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2013
卷: 308 起始页码: 161
结束页码: 168
语种: 英语
英文关键词: Folisol
; Hypermaritime
; Mounding
; Paludification
; Phosphorus
; Thuja plicata
Scopus关键词: Folisol
; Hypermaritime
; Mounding
; Paludification
; Thuja plicata
; Phosphorus
; Productivity
; Soils
; Uncertainty analysis
; Water supply
; Forestry
; browsing
; coniferous forest
; evapotranspiration
; fertilizer application
; forest floor
; forest management
; harvesting
; inorganic nitrogen
; logging (timber)
; old-growth forest
; paludification
; phosphorus
; plantation forestry
; productivity
; rhizosphere
; rooting
; scrub
; subsoil
; survival
; volume
; Forestry
; Phosphorus
; Productivity
; Soil
; Thuja Plicata
; Water Supply
; British Columbia
; Canada
英文摘要: The outer north coast of British Columbia has extensive areas (approx. 235,000ha) of old-growth forests characterized by western redcedar (Thuja plicata), yellow-cedar (Chamaecyparis nootkatensis) and salal (Gaultheria shallon) on gentle to moderate slopes with imperfectly-drained soils and deep forest floor accumulations. Uncertainty surrounding the long-term sustained yield of these low productivity forests led to the establishment of an operational trial in 2001 on Porcher Island, British Columbia, to address management issues, including the risk of paludification with tree removal, the uncertainty in site potential estimates, and the possible extent of nutrient deficiency amelioration with soil raking, mounding or phosphorus fertilization. Each site treatment was randomly replicated four times in an 18ha cutblock. In the second year following logging, the aerobic depth of the soil (as determined by the extent of rust on steel pins) averaged 16.9cm and did not differ between unharvested and harvested plots, suggesting losses in canopy interception and evapotranspiration did not alter the site hydrological balance. Western redcedar survival was 95% with planting and browse protection, and site index estimates of the plantation by age 12 averaged 19.5m at 50years (range 7.6-25.9), in stark contrast to measurements of 3.9m obtained from old-growth stands. Cedar foliar N concentrations increased significantly (range 0.9-1.3%) with the mineral content of soil mounds, demonstrating the benefit of mixing subsoils into the rooting zone, but the wide range in forest floor depths resulted in mounds being overall no more effective than light raking of the forest floor in improving productivity. Phosphorus fertilization (75kgha-1) also provided no gains in soil fertility or cedar nutrition, and initial increases in inorganic P were not detected in soils after 10years. Both site treatments stimulated the natural establishment of red alder (Alnus rubra), averaging 3950 stems per ha, which may both facilitate and compete with the cedar plantation over time. Overall we found few obstacles to sustainable yields from cedar-hemlock-salal scrub forests, albeit with the recognition of longer rotation lengths and smaller volume increments than current operational sites on the north coast of British Columbia. © 2013 . Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66358
Appears in Collections: 影响、适应和脆弱性
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作者单位: B.C. Ministry of Forests, Lands and Natural Resource Operations, Stn. Prov. Govt., PO Box 9536, Victoria B.C. V8W 9C4, Canada; B.C. Ministry of Forests, Lands and Natural Resource Operations, BAG 6000, Smithers B.C. V0J 2N0, Canada; Banner Consulting, 2365 Carr Road, Smithers B.C. V0J 2N4, Canada
Recommended Citation:
Kranabetter J.M.,LePage P.,Banner A.. Management and productivity of cedar-hemlock-salal scrub forests on the north coast of british columbia[J]. Forest Ecology and Management,2013-01-01,308