Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.foreco.2017.01.016 |
Norway spruce cone crops in uneven-aged stands in southern Finland: A case study | |
Nygren, Markku1; Rissanen, Kaisa2; Eerikainen, Kalle3; Saksa, Timo1; Valkonen, Sauli4 | |
2017-04-15 | |
发表期刊 | FOREST ECOLOGY AND MANAGEMENT |
ISSN | 0378-1127 |
EISSN | 1872-7042 |
出版年 | 2017 |
卷号 | 390 |
文章类型 | Article |
语种 | 英语 |
国家 | Finland |
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. (C) 2017 Elsevier B.V. All rights reserved. |
英文关键词 | Picea abies (L.) Seeds Flowering Regeneration Uneven-aged management Image analysis |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000398873700007 |
WOS关键词 | SEED CROP ; DOUGLAS-FIR ; MODELS ; PINE |
WOS类目 | Forestry |
WOS研究方向 | Forestry |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24148 |
专题 | 气候变化 |
作者单位 | 1.Nat Resources Inst Finland, Suonenjoki Unit, FI-77600 Suonenjoki, Finland; 2.Univ Helsinki, Dept Forest Sci, POB 27, FI-00014 Helsinki, Finland; 3.Suomen Sijoitusmetsat Oy, Lansikatu 15, FI-80110 Joensuu, Finland; 4.Nat Resources Inst Finland, Latokartanonkaari 9, FI-00790 Helsinki, Finland |
推荐引用方式 GB/T 7714 | Nygren, Markku,Rissanen, Kaisa,Eerikainen, Kalle,et al. Norway spruce cone crops in uneven-aged stands in southern Finland: A case study[J]. FOREST ECOLOGY AND MANAGEMENT,2017,390. |
APA | Nygren, Markku,Rissanen, Kaisa,Eerikainen, Kalle,Saksa, Timo,&Valkonen, Sauli.(2017).Norway spruce cone crops in uneven-aged stands in southern Finland: A case study.FOREST ECOLOGY AND MANAGEMENT,390. |
MLA | Nygren, Markku,et al."Norway spruce cone crops in uneven-aged stands in southern Finland: A case study".FOREST ECOLOGY AND MANAGEMENT 390(2017). |
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