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| DOI | 10.1016/j.foreco.2019.117825 |
| Coppicing improves the growth response of short-rotation hybrid aspen to elevated atmospheric humidity | |
| Tullus A.; Rosenvald K.; Lutter R.; Kaasik A.; Kupper P.; Sellin A. | |
| 发表日期 | 2020 |
| ISSN | 0378-1127 |
| 卷号 | 459 |
| 英文摘要 | Aspens are fast-growing clonal trees with a wide circumboreal distribution range, suitable for the production of pulp and bioenergy. The adaptability of aspen short-rotation coppice systems to climate change has rarely been investigated. For a large part of aspens’ northern range, climate models predict an increase in precipitation and, consequently, in atmospheric humidity. Our aim was to clarify the long-term effect of elevated air humidity on vegetative reproduction capacity and dynamics of above-ground growth and size structure in aspen stands. We analysed tree growth data from two consecutive 6-year rotations (a planted and a coppice generation) in experimental short-rotation hybrid aspen (Populus tremula L. × P. tremuloides Michx.) stands in the Free Air Humidity Manipulation (FAHM) experiment in Estonia. In three plots, mean relative air humidity was elevated by 7% and three plots were controls. Across two rotation periods, the humidification effect on tree height and/or stem basal area increment was year-dependent (p < 0.001): negative in 4 years, positive also in 4 years and non-significant in 3 years. Mean basal area of humidified (11.6 ± 0.8 cm2) and control trees (15.0 ± 1.0 cm2) differed significantly (p = 0.035) at the end of the first but not the second rotation period (9.3 ± 0.9 cm2 and 9.3 ± 1.2 cm2, respectively). Average growth differences levelled out already in the beginning of the second rotation, suggesting that some root-level acclimation must have taken place. The annual size-growth relationships (SGR) indicated a more size-symmetric growth in humidified (SGR = 1.00 ± 0.05) and a size-asymmetric growth (SGR = 1.12 ± 0.04) in control stands, implying a greater role of root-competition in humidified stands. In humidified stands, the growth of re-sprouting trees was more strongly determined by parent tree size, indicating a stronger carry-over of size hierarchy. The tree height diversity fluctuated more in control stands, where mortality was higher, especially after dry years. To summarise, short- and long-term responses of hybrid aspen to elevated air humidity varied, emphasizing the importance of long-term climate manipulations with trees. Generally, hybrid aspen short-rotation coppice forests showed promising acclimation capacity with future more humid climate predicted for northern latitudes. © 2019 Elsevier B.V. |
| 关键词 | Cell proliferationClimate changeClimate modelsForestryHumidity controlRotationAspen coppiceForest acclimationIntraspecific competitionPopulusStand structuresAtmospheric humidityacclimationadaptationbasal areaclimate changeclonecoppicecrop rotationdeciduous treeforest ecosystemgeographical distributiongrowthgrowth responsehumidityhybridintraspecific competitionmortalitysize structurestand structurevegetative reproductionAirForestryGrowthHumidity ControlPopulusRotationTreesEstoniaPopulusPopulus tremulaPopulus tremuloides |
| 语种 | 英语 |
| 来源机构 | Forest Ecology and Management |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/133051 |
| 推荐引用方式 GB/T 7714 | Tullus A.,Rosenvald K.,Lutter R.,et al. Coppicing improves the growth response of short-rotation hybrid aspen to elevated atmospheric humidity[J]. Forest Ecology and Management,2020,459. |
| APA | Tullus A.,Rosenvald K.,Lutter R.,Kaasik A.,Kupper P.,&Sellin A..(2020).Coppicing improves the growth response of short-rotation hybrid aspen to elevated atmospheric humidity.,459. |
| MLA | Tullus A.,et al."Coppicing improves the growth response of short-rotation hybrid aspen to elevated atmospheric humidity".459(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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