Farjana, Tanjim, 2024. Influence of Drought on Tree Growth in Different Thinning Treatments in Second Rotation of Poplar Plantations. Second cycle, A2E. Alnarp: SLU, Southern Swedish Forest Research Centre
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Abstract
This study examines the dynamic interplay between tree growth and drought stress in a second
rotation poplar plantation in southern Sweden. It evaluates the responses of trees, focusing on growth
metrics (volume, basal area increments) and recovery patterns after water stress, across various
thinning treatments and tree sizes by analysing tree ring width. Significant variations in growth
metrics were observed, particularly during the drought of 2018.
To analyse the resistance (ability to remain largely unchanged) of trees during the drought, deltaDiv
was calculated, where deltaDiv = (projected growth - observed growth) / observed growth. This
calculated result highlighted that smaller diameter trees (dbh 9-11 cm) showed higher resistance to
drought compared to larger diameter trees (dbh 25-35 cm).
The analysis of Volume Increment (VI) and Basal Area Increment (BAI) aimed to reveal the
resilience (capacity to recover) of trees across different tree sizes (dbh 9-11 cm, 15-18 cm, 20-22
cm, and 25-35 cm) and thinning treatments (control/unthinned, light thinning, medium thinning, and
heavy thinning). The study found that tree density influences drought resilience, with heavy thinning
treatment (550 trees/ha) demonstrating higher resilience compared to unthinned plots (6000
trees/ha) and light thinning (3000 trees/ha) treatments, which showed limited growth responses.
| Main title: | Influence of Drought on Tree Growth in Different Thinning Treatments in Second Rotation of Poplar Plantations |
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| Authors: | Farjana, Tanjim |
| Supervisor: | Böhlenius, Henrik and Drobyshev, Igor and Muraro, Luca |
| Examiner: | Holmström, Emma and Matsala, Maksym |
| Series: | UNSPECIFIED |
| Volume/Sequential designation: | UNSPECIFIED |
| Year of Publication: | 2024 |
| Level and depth descriptor: | Second cycle, A2E |
| Student's programme affiliation: | SM001 Euroforester - Master's Programme 120 HEC |
| Supervising department: | (S) > Southern Swedish Forest Research Centre |
| Keywords: | Poplar plantation, tree ring width, drought stress, resistance, resilience, mixed effect model, thinning treatments, size-dependent responses, sustainability |
| URN:NBN: | urn:nbn:se:slu:epsilon-s-20348 |
| Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-20348 |
| Language: | English |
| Deposited On: | 16 Aug 2024 08:52 |
| Metadata Last Modified: | 17 Aug 2024 01:01 |
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