DOI: 10.1016/j.foreco.2012.12.006
Scopus记录号: 2-s2.0-84871910064
论文题名: Regeneration dynamics of non-native northern red oak (Quercus rubra L.) populations as influenced by environmental factors: A case study in managed hardwood forests of southwestern Germany
作者: Major K.C. ; Nosko P. ; Kuehne C. ; Campbell D. ; Bauhus J.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2013
卷: 291 起始页码: 144
结束页码: 153
语种: 英语
英文关键词: Gap ecology
; Introduced species
; Invasive species
; Quercus rubra
; Regeneration ecology
; Seedling growth
Scopus关键词: 19th century
; Canopy closures
; Canopy gaps
; Central Europe
; Closed canopies
; Diameter-at-breast heights
; Environmental factors
; Fertile sites
; Hardwood forests
; Hardwood stands
; Introduced species
; Invasive species
; Non-native
; Nonindigenous species
; Quercus rubra
; Red oak
; Regeneration dynamics
; Relative abundance
; Seed dispersal
; Seedling growth
; Selective harvesting
; Shade tolerance
; Site conditions
; Tree species
; Trees and shrubs
; Dynamics
; Ecology
; Hardwoods
; Reforestation
; canopy gap
; deciduous forest
; deciduous tree
; eighteenth century
; environmental factor
; gap dynamics
; invasive species
; nineteenth century
; regeneration
; relative abundance
; seed dispersal
; seedling
; shade tolerance
; understory
; Ecology
; Germany
; Growth
; Hardwoods
; Quercus Rubra
; Reforestation
; Seedlings
; Species Identification
; Baden-Wurttemberg
; Freiburg Im Breisgau
; Germany
; Quercus rubra
英文摘要: Quercus rubra L. (northern red oak), a tree species having moderate shade tolerance, is failing to regenerate across its native range in North America, largely due to its inability to compete with shade-tolerant species. Throughout central Europe, where it was introduced in the 18th and 19th centuries, Q. rubra exhibits prolific regeneration even when growing with shade-tolerant trees under closed canopy conditions. A better understanding of factors that allow the proliferation of Q. rubra in its adventive range may provide insights into the conditions necessary to promote Q. rubra in North America. Our study investigated the regeneration dynamics of Q. rubra in six hardwood stands near Freiburg, Germany in relation to site conditions and the relative abundance and growth of indigenous tree species in forest understoreys. Despite high (94-98%) canopy closure at all stands, the density of Q. rubra regeneration (<2m in height) was greater than that of all other tree species combined, averaging 24stemsm-1. Density of Q. rubra seedlings reached 125stemsm-2 directly below seed trees; however, the lack of seedlings beyond 15m from a seed tree suggested limited seed dispersal. Seedlings were less abundant at relatively fertile sites with lowest densities corresponding most closely to elevated soil calcium. The abundance of Q. rubra was most highly variable in the midstorey (trees and shrubs >2.0m in height and <10cm diameter at breast height) with densities ranging from 200 to 1500stemsha-1. Periodic selective harvesting at all stands, appears to maintain a disturbed state of mid-succession that allows Q. rubra seedlings to persist and recruit into the midstorey as canopy gaps become available. Clearly, stands of this non-indigenous species are successfully regenerating and the dominance of Q. rubra appears to be sustainable. Despite its benign performance in North America, Q. rubra can be an effective competitor under suitable conditions. Our findings deemphasize the importance of canopy closure on Q. rubra regeneration and suggest that in North America, preliminary cuts performed prior to shelterwood harvests should focus on midstorey removal of competitor species especially following oak mast years. © 2012 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66772
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology and Chemistry, Nipissing University, North Bay, ON P1B 8L7, Canada; Department of Biology, Laurentian University, Sudbury, ON P3E 2C6, Canada; Institute of Silviculture, Freiburg University, D-79085 Freiburg, Germany
Recommended Citation:
Major K.C.,Nosko P.,Kuehne C.,et al. Regeneration dynamics of non-native northern red oak (Quercus rubra L.) populations as influenced by environmental factors: A case study in managed hardwood forests of southwestern Germany[J]. Forest Ecology and Management,2013-01-01,291