Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.foreco.2018.10.047 |
Survival dynamics of mechanically topped Douglas-fir (Pseudotsuga menziesii) and western hemlock (Tsuga heterophylla) snags in Douglas-fir plantations, Oregon, USA | |
Hane, Matthew E.1; Kroll, Andrew J.1; Springford, Aaron2; Giovanini, Jack3; Rochelle, Mike4; Arnett, Edward B.5 | |
2019-02-15 | |
发表期刊 | FOREST ECOLOGY AND MANAGEMENT |
ISSN | 0378-1127 |
EISSN | 1872-7042 |
出版年 | 2019 |
卷号 | 433页码:105-110 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Structural enrichment in commercial tree plantations is a potential tool to increase snag numbers but relatively little information is available about how species, size, and spatial distribution of created snags are associated with longevity of these structures. We created 1197 snags in 31 harvest units from 1997 to 1999 in the Cascade and Coast Ranges, Oregon, USA, by topping live trees with harvesting equipment. We used an experimental design to distribute created snags at three densities and as either single or clumped created snags. We fit Weibull and log-logistic Accelerated Failure Time models and found that the median failure time was insensitive to the choice of distribution. We found a small positive effect of diameter at breast height (DBH) and a slight negative effect of increasing distance between created snags on survival. Assuming Weibull and log-logistic distributions at mean observed values of DBH and distance between snags, median survival times for Douglas-fir (Pseudotsuga menziesii) were 21.0 (95% confidence interval: 19.3, 22.8) years and 21.2 (19.7, 22.8) years, respectively. For western hemlock (Tsuga heterophylla), median survival times were 13.0 (11.9, 14.2) years and 12.5 (11.4, 13.7) years, respectively. Although the two failure distributions had similar median failure times, the log-logistic implies a higher survival probability over time for snags that remained standing at the end of the study period. Created snags can be a useful supplement for harvest units rotated at similar to 45 years and Douglas-fir will be available for longer as standing structures. For example, under the log-logistic model, a predicted 5% of Douglas-fir snags are retained to rotation age, so that 40 snags per hectare would be required at harvest to maintain 2 snags per hectare through stand rotation. Snags created from western hemlock will provide an early rotation pulse but are unlikely to last longer than 20 years. Our results suggest that longevity can be increased by maximizing the snag size within the safety constraints of harvesting equipment. Scattering of snags may have a slightly negative effect on snag survival but this outcome should be weighed against potential ecological benefits of variation in snag distributions. |
英文关键词 | Accelerated failure time model Coarse woody debris Created snags Douglas-fir Intensive forest management Oregon Structural enrichment Survival modeling |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000456902500011 |
WOS关键词 | MULTIVARIATE DATA-ANALYSIS ; CLEAR-CUT FORESTS ; PACIFIC-NORTHWEST ; MANAGED FORESTS ; TREE RETENTION ; NEST SURVIVAL ; LONGEVITY ; WOOD ; CONSERVATION ; MODELS |
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/23637 |
专题 | 气候变化 |
作者单位 | 1.Weyerhaeuser, 785 N 42nd St, Springfield, OR 97478 USA; 2.Weyerhaeuser, 220 Occident Ave, Seattle, WA 98104 USA; 3.Weyerhaeuser, WTC 1A5 Fed Way, Seattle, WA 98063 USA; 4.Weyerhaeuser, 34904 Brewster Rd, Lebanon, OR 97355 USA; 5.Theodore Roosevelt Conservat Partnership, 3604 Canter Lane, Loveland, CO 80537 USA |
推荐引用方式 GB/T 7714 | Hane, Matthew E.,Kroll, Andrew J.,Springford, Aaron,et al. Survival dynamics of mechanically topped Douglas-fir (Pseudotsuga menziesii) and western hemlock (Tsuga heterophylla) snags in Douglas-fir plantations, Oregon, USA[J]. FOREST ECOLOGY AND MANAGEMENT,2019,433:105-110. |
APA | Hane, Matthew E.,Kroll, Andrew J.,Springford, Aaron,Giovanini, Jack,Rochelle, Mike,&Arnett, Edward B..(2019).Survival dynamics of mechanically topped Douglas-fir (Pseudotsuga menziesii) and western hemlock (Tsuga heterophylla) snags in Douglas-fir plantations, Oregon, USA.FOREST ECOLOGY AND MANAGEMENT,433,105-110. |
MLA | Hane, Matthew E.,et al."Survival dynamics of mechanically topped Douglas-fir (Pseudotsuga menziesii) and western hemlock (Tsuga heterophylla) snags in Douglas-fir plantations, Oregon, USA".FOREST ECOLOGY AND MANAGEMENT 433(2019):105-110. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论