DOI: 10.1016/j.foreco.2013.04.005
Scopus记录号: 2-s2.0-84881477058
论文题名: Historical structure and composition of ponderosa pine and mixed-conifer forests in south-central oregon
作者: Hagmann R.K. ; Franklin J.F. ; Johnson K.N.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2013
卷: 304 起始页码: 492
结束页码: 504
语种: 英语
英文关键词: Dry forest restoration
; Historical range of variation
; Mixed conifer
; Ponderosa pine
; Reference conditions
Scopus关键词: Dry forests
; Historical range of variation
; Mixed conifer
; Ponderosa pines
; Reference condition
; Conservation
; Drought
; Ecosystems
; Structure (composition)
; Forestry
; basal area
; community composition
; community structure
; coniferous forest
; dominance
; drought resistance
; dry forest
; forest inventory
; habitat type
; mixed forest
; tolerance
; wildfire
; Conservation
; Drought
; Ecosystems
; Forestry
; Pinus Ponderosa
; Restoration
; Softwoods
; Oregon
; United States
; Coniferophyta
; Pinus ponderosa
英文摘要: We summarized structure and composition of dry forests from a 90-year-old timber inventory collected by the Bureau of Indian Affairs on the former Klamath Indian Reservation (now part of the Fremont-Winema National Forest). This analysis includes data from 4,24,626 conifers ≥15cmdbh on 3068 transects covering 6646ha. The data represent a 10-20% sample of 38,651ha of forest growing on sites that are classified as ponderosa pine (Pinus ponderosa) and mixed-conifer habitat types distributed within the 1,17,672ha of the study area. Large, drought- and fire-tolerant ponderosa pine dominated these forests. Large tree (>53cmdbh) basal area (13±7m2/ha) contributed 83±16% of total basal area; 81±20% of the large-tree basal area was ponderosa pine. Composition and structure of forests on mixed-conifer sites were very similar to those on ponderosa pine sites. Variability in composition and structure was recorded on all habitat types and was highest on moist mixed-conifer sites. Stand densities (trees per hectare, tph) have more than tripled over the past 90years from 68±28tph to a current density of 234±122tph recorded in Current Vegetation Survey data collected by the United States Forest Service. Mean basal area, however, increased by less than 20%. Basal area of large trees (>53cmdbh) has declined by 50%, and the abundance of large trees as a proportion of the total number of trees per hectare has decreased by more than a factor of five. This landscape-level record of historical forest conditions allows inferences about structure and composition across tens of thousands of hectares. A historical landscape emerges which supports current working hypotheses that frequent, low- to moderate-severity wildfires maintained a predominantly low-density forest dominated by large, fire- and drought-tolerant ponderosa pines across a significant moisture and productivity gradient from the driest ponderosa pine to the mixed-conifer habitat types. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66518
Appears in Collections: 影响、适应和脆弱性
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作者单位: School of Environmental and Forest Sciences, University of Washington, Box 352100, Seattle, WA 98195, United States; Department of Forest Ecosystems and Society, Oregon State University, 321 Richardson Hall, Corvallis, OR 97331, United States
Recommended Citation:
Hagmann R.K.,Franklin J.F.,Johnson K.N.. Historical structure and composition of ponderosa pine and mixed-conifer forests in south-central oregon[J]. Forest Ecology and Management,2013-01-01,304