DOI: 10.1016/j.foreco.2017.01.016
Scopus记录号: 2-s2.0-85011660186
论文题名: Norway spruce cone crops in uneven-aged stands in southern Finland: A case study
作者: Nygren M. ; Rissanen K. ; Eerikäinen K. ; Saksa T. ; Valkonen S.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 390 起始页码: 68
结束页码: 72
语种: 英语
英文关键词: Flowering
; Image analysis
; Picea abies (L.)
; Regeneration
; Seeds
; Uneven-aged management
Scopus关键词: Crops
; Image analysis
; Plants (botany)
; Reforestation
; Seed
; Trees (mathematics)
; X ray analysis
; Flowering
; Management practices
; Norway spruce stands
; Picea abies
; Regeneration
; Single tree selection
; Uneven-aged management
; Uneven-aged stands
; Forestry
; coniferous forest
; diameter
; flowering
; forest management
; harvesting
; height determination
; image analysis
; recruitment (population dynamics)
; regeneration
; ripening
; seed
; stand dynamics
; Finland
; Hexapoda
; Megastigmus strobilobius
; Picea abies
英文摘要: Norway spruce cone crops in individual trees from two seed ripening years 2012 and 2014 were studied. Data were collected from five stands in southern Finland, managed by single-tree selection harvests since the 1980s. The upper third of living crown of each individual tree was photographed for digital cone counting with image analysis. The average number of cones per tree for trees bearing any cones was 92 in 2014 and 66 in 2012. Highest cone numbers found per individual tree were 526 in the year 2014 and 364 in the year 2012. Of all trees studied, 55.5% produced cones during both years, 9.6% produced cones once and 34.9% did not produce cones in 2012 or 2014. The number of cones per tree in 2014 was positively correlated with tree diameter at breast height and the presence of cones (at least twenty) in that particular individual two years earlier and negatively correlated with local basal area. The quality of the seed crop in 2014 as determined in two of the stands was poor. Based on X-ray analyses, 44% of seeds were empty, 29% were damaged by insects feeding on seeds (Plemeliella abietina or Megastigmus strobilobius) and only 25% were full and capable of germination. The results have implications for management practices in uneven-aged Norway spruce stands. It is suggested that at each harvest entry, some large, prolific trees should be retained in order to increase the total number of seeds produced in a stand to enhance regeneration and the recruitment of new seedlings. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64457
Appears in Collections: 影响、适应和脆弱性
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作者单位: Natural Resources Institute Finland, Suonenjoki Unit, Juntintie 154, FI-77600 Suonenjoki, Finland; Department of Forest Sciences, University of Helsinki, P.O. Box 27, Finland; Suomen Sijoitusmetsät Oy, Länsikatu 15, FI-80110 Joensuu, Finland; Natural Resources Institute Finland, Latokartanonkaari 9, FI-00790 Helsinki, Finland
Recommended Citation:
Nygren M.,Rissanen K.,Eerikäinen K.,et al. Norway spruce cone crops in uneven-aged stands in southern Finland: A case study[J]. Forest Ecology and Management,2017-01-01,390