Impact of spacing and pruning on quantity, quality and economics of Douglas-fir sawn timber: scenario and sensitivity analysis

Rais, Andreas; Poschenrieder, Werner; Kuilen, J.W.G. van de; Pretzsch, Hans

doi:10.1007/s10342-020-01282-8

Cited by 10 publications

(7 citation statements)

References 21 publications

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“…Higher extraction ratio implies greater economic returns from production of wood products, which could also serve as long-term carbon storage or fuel for BECCS through methods such as oxyfuel combustion 5 . However, an in-depth economic study such as net present value analysis is necessary to fully understand the implications on stand- and landscape-level 38 , 39 . Nevertheless, our study shows that modeling biomass allocation strategy of Z .…”

Section: Discussionmentioning

confidence: 99%

Modeling biomass allocation strategy of young planted Zelkova serrata trees in Taiwan with component ratio method and seemingly unrelated regressions

Chen

Lam

2021

Sci Rep

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Trees accumulate biomass by sequestrating atmospheric carbon and allocate it to different tree components. A biomass component ratio is the ratio of biomass in a tree component to total tree biomass. Modeling the ratios for Zelkova serrata, an important native reforestation tree species in Taiwan, helps in understanding its biomass allocation strategy to design effective silvicultural treatments. In this study, we applied Component Ratio Method (CRM) to relate biomass component ratios of main stem, large branch, twig, and foliage to tree attributes of Z. serrata from a 9-year-old plantation. Nonlinear and linear CRM models were fitted with Seemingly Unrelated Regression to account for model correlations. Linear CRM models with dbh as the predictor had the best fit with model correlations as high as 80%. About 46% and 40% of total tree biomass was allocated to main stem and large branch, respectively. However, main stem biomass decreased by 1.9% with every 1-cm increase in dbh, but large branch biomass increased by 2.2% instead. Results suggest that dominant Z. serrata trees tend to branch and fork, while smaller trees invest in larger main stem. An early pruning treatment should focus on dominant trees to maintain crown ratio and ensure wood quality.

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Section: Discussionmentioning

confidence: 99%

Modeling biomass allocation strategy of young planted Zelkova serrata trees in Taiwan with component ratio method and seemingly unrelated regressions

Chen

Lam

2021

Sci Rep

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“…Recent studies also indicate that plantations with 62 500 seedlings of E. camaldulensis per ha and 81 633 plants of E. globulus per ha were reported in some areas of the region. Planting seedlings with closer spacing than the standard spacing reduces production and wood quality (Rais et al, 2020;Rocha et al, 2016). Moreover, the majority of planted seedlings do not receive any silvicultural treatment after planting (Bekele, 2011b;Tadesse et al, 2019).…”

Section: Plate 2: Expansion Of Acacia Decurrens In Awi (A) and Eucaly...mentioning

confidence: 99%

Trend and Current Status of Forest Resources in the Amhara National Regional State, Ethiopia: A Review

Alem

2023

East Afr. j. for. agrofor.

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Ethiopia is endowed with diverse forest resources. Amhara National Regional State, one of the administrative regions in Ethiopia, has diverse ecology and is endowed with diversified flora and fauna. Forest resources in the region provide various uses and services to the local community. But the forest resources of the region have faced huge devastation due to high human and livestock pressure. As a response, efforts have been made to conserve and develop the forest resources of the region. However, there is a lack of comprehensive information about the current status and trend of forest resources in the region. This review provides the current status and trend of forest resources in the region based on a literature search from different sources. The review showed that the overall forest resource of the region decreased over time, despite the expansion of plantation forests. Most of the natural forest resources of the region disappeared and remnants are found in church compounds and other forest conservation areas. Plantation forests in the region are dominated by exotic tree species, majorly Eucalyptus. Most important non-timber forest products have been neglected, and modern forest development interventions are lacking. This review paper is indispensable for decision-makers, academicians, development, and research institutions to direct their focus toward developing technologies and information for the sustainable development of the forest resources in the region. Appropriate forest management and utilization practices have to be implemented for the sustainability of the forest resources in the region. Since the forest resource in the region is under dynamic change, regularly updating and providing information on its current status is imperative for timely and proper decision-making

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“…However, there has been a long-standing controversial issue of how pruning severity affects tree growth (Clark & Matheny, 2010). Pruning can negatively affect growth through excessive intensity (Rais et al, 2020). Therefore, most pruning prescriptions are based on empirical data combining operational needs with tree growth responses (Maurin & DesRochers, 2013;Shimada, 2017) or based on previous pruning studies.…”

Section: Introductionmentioning

confidence: 99%

Change Point Analysis to Detect the Effect of Pruning Severity on Tree Growth

Iguchi

2024

OJF

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The effect of pruning severity on tree growth was analyzed by change point detection using segmented regression. The present study applied this analysis to a well-known published data set including diameter growth response, tree age, pruning severity and pretreatment crown size. First, multiple regression analysis was performed to assess the effect of tree age, pruning severity and pretreatment crown size on diameter growth response. Next, segmented regression analysis was performed to assess the effect of pruning severity on diameter growth response. The results of the multiple regression showed that diameter growth response was significantly influenced by pruning severity and pretreatment crown size. The results of the segmented regression showed that in the whole data set, an abrupt change toward a decrease in diameter growth response was detected at 25% of the live crown removed. However, in the group of fully crowned and open-grown, diameter growth response continuously decreased with increasing pruning severity with no significant abrupt change, whereas in the group of 70% -90% live crown, diameter growth response did not significantly decrease up to the break point (53% crown removed) and then abruptly decreased. This may be the first study to show the numerical evaluation of the effect of pruning severity on tree growth by change point analysis.

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Impact of spacing and pruning on quantity, quality and economics of Douglas-fir sawn timber: scenario and sensitivity analysis

Cited by 10 publications

References 21 publications

Modeling biomass allocation strategy of young planted Zelkova serrata trees in Taiwan with component ratio method and seemingly unrelated regressions

Modeling biomass allocation strategy of young planted Zelkova serrata trees in Taiwan with component ratio method and seemingly unrelated regressions

Trend and Current Status of Forest Resources in the Amhara National Regional State, Ethiopia: A Review

Change Point Analysis to Detect the Effect of Pruning Severity on Tree Growth

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