Effect of Early Thinning Treatments on Above-Ground Growth, Biomass Production, Leaf Area Index and Leaf Growth Efficiency in a Hybrid Aspen Coppice Stand.
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| Title: | Effect of Early Thinning Treatments on Above-Ground Growth, Biomass Production, Leaf Area Index and Leaf Growth Efficiency in a Hybrid Aspen Coppice Stand. |
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| Authors: | Hepner, Heiki1 (AUTHOR), Lutter, Reimo1,2 (AUTHOR) reimo.lutter@emu.ee, Tullus, Arvo3 (AUTHOR), Kanal, Arno4 (AUTHOR), Tullus, Tea1 (AUTHOR), Tullus, Hardi1 (AUTHOR) |
| Source: | BioEnergy Research. Mar2020, Vol. 13 Issue 1, p197-209. 13p. |
| Subjects: | Leaf area index, European aspen, Biomass production, Leaf growth, Forests & forestry |
| Abstract: | The bioeconomy strategies in the EU are expected to lead to increased consumption of woody biomass. The empirical knowledge of asexually regenerated hybrid aspen (Populus tremula L. × P. tremuloides Michx.) coppice stand production and responses to silvicultural treatments is still poor. In hemiboreal Estonia, four different management treatments (corridor thinning with ~67% removal, cross-corridor thinning with ~89% removal, single-tree thinning with ~97% removal and control with no management activity) were applied in a 2-year-old hybrid aspen coppice stand, and effects on tree above-ground biomass and leaf characteristics were investigated during three post-thinning years. Hybrid aspen mean annual increment of above-ground biomass peaked at 6.3 (range: 3.6–8.5) Mg ha−1 in year 4, suggesting 4–5 years as an optimal age for bioenergy harvest. The above-ground growth characteristics of dominant trees did not differ from control area. The current annual increment of the height, biomass and leaf growth efficiency (LGE) of dominant trees under single-tree thinning remained even lower compared with the other treatments. Dominant trees were more efficient in resource use, as their LGE values were 21–50% higher compared with the stand average value. Poor growth, high mortality and low LGE in single-tree thinning indicate that the low density of remaining trees created an imbalance between leaf area and parent root system. The hybrid aspen coppice stand showed a high biomass production during early development. We recommend modest early thinning in vegetative hybrid aspen stands to ensure a sufficient balance between leaf area and parent root system. [ABSTRACT FROM AUTHOR] |
| Copyright of BioEnergy Research is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 142908558 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Effect of Early Thinning Treatments on Above-Ground Growth, Biomass Production, Leaf Area Index and Leaf Growth Efficiency in a Hybrid Aspen Coppice Stand. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Hepner%2C+Heiki%22">Hepner, Heiki</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lutter%2C+Reimo%22">Lutter, Reimo</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> reimo.lutter@emu.ee</i><br /><searchLink fieldCode="AR" term="%22Tullus%2C+Arvo%22">Tullus, Arvo</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kanal%2C+Arno%22">Kanal, Arno</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tullus%2C+Tea%22">Tullus, Tea</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tullus%2C+Hardi%22">Tullus, Hardi</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22BioEnergy+Research%22">BioEnergy Research</searchLink>. Mar2020, Vol. 13 Issue 1, p197-209. 13p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Leaf+area+index%22">Leaf area index</searchLink><br /><searchLink fieldCode="DE" term="%22European+aspen%22">European aspen</searchLink><br /><searchLink fieldCode="DE" term="%22Biomass+production%22">Biomass production</searchLink><br /><searchLink fieldCode="DE" term="%22Leaf+growth%22">Leaf growth</searchLink><br /><searchLink fieldCode="DE" term="%22Forests+%26+forestry%22">Forests & forestry</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The bioeconomy strategies in the EU are expected to lead to increased consumption of woody biomass. The empirical knowledge of asexually regenerated hybrid aspen (Populus tremula L. × P. tremuloides Michx.) coppice stand production and responses to silvicultural treatments is still poor. In hemiboreal Estonia, four different management treatments (corridor thinning with ~67% removal, cross-corridor thinning with ~89% removal, single-tree thinning with ~97% removal and control with no management activity) were applied in a 2-year-old hybrid aspen coppice stand, and effects on tree above-ground biomass and leaf characteristics were investigated during three post-thinning years. Hybrid aspen mean annual increment of above-ground biomass peaked at 6.3 (range: 3.6–8.5) Mg ha−1 in year 4, suggesting 4–5 years as an optimal age for bioenergy harvest. The above-ground growth characteristics of dominant trees did not differ from control area. The current annual increment of the height, biomass and leaf growth efficiency (LGE) of dominant trees under single-tree thinning remained even lower compared with the other treatments. Dominant trees were more efficient in resource use, as their LGE values were 21–50% higher compared with the stand average value. Poor growth, high mortality and low LGE in single-tree thinning indicate that the low density of remaining trees created an imbalance between leaf area and parent root system. The hybrid aspen coppice stand showed a high biomass production during early development. We recommend modest early thinning in vegetative hybrid aspen stands to ensure a sufficient balance between leaf area and parent root system. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of BioEnergy Research is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s12155-020-10111-0 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 197 Subjects: – SubjectFull: Leaf area index Type: general – SubjectFull: European aspen Type: general – SubjectFull: Biomass production Type: general – SubjectFull: Leaf growth Type: general – SubjectFull: Forests & forestry Type: general Titles: – TitleFull: Effect of Early Thinning Treatments on Above-Ground Growth, Biomass Production, Leaf Area Index and Leaf Growth Efficiency in a Hybrid Aspen Coppice Stand. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Hepner, Heiki – PersonEntity: Name: NameFull: Lutter, Reimo – PersonEntity: Name: NameFull: Tullus, Arvo – PersonEntity: Name: NameFull: Kanal, Arno – PersonEntity: Name: NameFull: Tullus, Tea – PersonEntity: Name: NameFull: Tullus, Hardi IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 03 Text: Mar2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 19391234 Numbering: – Type: volume Value: 13 – Type: issue Value: 1 Titles: – TitleFull: BioEnergy Research Type: main |
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