Thinning Intensity and Growth Response in a Quercus acuta Stand

Jung, Su Young

doi:10.14578/jkfs.2015.104.4.536

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…According to an analysis of 2021 forestry survey data, the average DBH growth was found to be significantly greater in the LT treatment plot (2.9 cm) than in the control plot (2.0 cm; p < .05), showing the effects of thinning with time. These results (i.e., DBH growth ≥ 4 mm in the HT treatment plot and ≥ 3 mm in the control group) show trends similar to those reported by Jung et al (2015), who described the thinning effects on the Quercus acuta stand. Jung et al (2015) reported that the annual DBH growth after thinning was about 5 mm in the HT treatment plot and 2 mm in the control group.…”

Section: Anamorphicsupporting

confidence: 89%

“…These results (i.e., DBH growth ≥ 4 mm in the HT treatment plot and ≥ 3 mm in the control group) show trends similar to those reported by Jung et al (2015), who described the thinning effects on the Quercus acuta stand. Jung et al (2015) reported that the annual DBH growth after thinning was about 5 mm in the HT treatment plot and 2 mm in the control group. There was no significant difference in the average tree height between treatment plots (Table 2).…”

Section: Anamorphicsupporting

confidence: 89%

“…There are few experimental studies that estimate growth functions in the thinning stage of planted forests of warm-temperate, broad-leaved evergreens in Korea. The estimation of growth functions including diameter, dominant tree height, and volume related to the thinning of planted forests can be made based on stand density management diagrams prepared for Pinus densiflora (Jung et al, 2015;Park et al, 2016) and Chamaecyparis obtusa (Park et al, 2018), for which large-scale afforestation has been carried out. In particular, it is difficult to find the results of growth model estimates for each level of treatment for the first thinning of planted QGT stands in Korea.…”

Section: Introductionmentioning

confidence: 99%

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Development of Diameter Growth Models by Thinning Intensity of Planted Quercus glauca Thunb. Stands

Jung

Lee²,

Kim

2021

J. People Plants Environ

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Background and objective: This study was conducted to develop diameter growth models for thinned Quercus glauca Thunb. (QGT) stands to inform production goals for treatment and provide the information necessary for the systematic management of this stands.Methods: This study was conducted on QGT stands, of which initial thinning was completed in 2013 to develop a treatment system. To analyze the tree growth and trait response for each thinning treatment, forestry surveys were conducted in 2014 and 2021, and a one-way analysis of variance (ANOVA) was executed. In addition, non-linear least squares regression of the PROC NLIN procedure was used to develop an optimal diameter growth model.Results: Based on growth and trait analyses, the height and height-to-diameter (H/D) ratio were not different according to treatment plot (p > .05). For the diameter of basal height (DBH), the heavy thinning (HT) treatment plot was significantly larger than the control plot (p < .05). As a result of the development of diameter growth models by treatment plot, the mean squared error (MSE) of the Gompertz polymorphic equation (control: 2.2381, light thinning: 0.8478, and heavy thinning: 0.8679) was the lowest in all treatment plots, and the Shapiro-Wilk statistic was found to follow a normal distribution (p > .95), so it was selected as an equation fit for the diameter growth model.Conclusion: The findings of this study provide basic data for the systematic management of Quercus glauca Thunb. stands. It is necessary to construct permanent sample plots (PSP) that consider stand status, location conditions, and climatic environments.

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Section: Anamorphicsupporting

confidence: 89%

Section: Anamorphicsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Development of Diameter Growth Models by Thinning Intensity of Planted Quercus glauca Thunb. Stands

Jung

Lee²,

Kim

2021

J. People Plants Environ

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“…We estimated stem biomass density by assuming stem form factor F = 0.5 (Lumbres et al, 2014) as δ=B AG,stem /(0.5GH) and the results ranged from 0.16 to 2.0 g/cm 3 . By choosing other realistic stand or stem form factor values (Cannell, 1984;Jung et al, 2015) the stem organic matter density estimates did not substantially improve. However, when suffi cient data was available for stand form factor conversion, then it was possible to compare biomass estimates from tropical forests with hemiboreal forests by their GH (Figure 5).…”

Section: Main Species Peapuuliikmentioning

confidence: 95%

Estimation of above-ground biomass in forest stands from regression on their basal area and height

et al. 2016

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A generic regression model for above-ground biomass of forest stands was constructed based on published data (R2 = 0.88, RSE = 32.8 t/ha). The model was used 1) to verify two allometric regression models of trees from Scandinavia applied to repeated measurements of 275 sample plots from database of Estonian Network of Forest Research (FGN) in Estonia, 2) to analyse impact of between-tree competition on biomass, and 3) compare biomass estimates made with different European biomass models applied on standardized forest structures. The model was verified with biomass measurements from hemiboreal and tropical forests. The analysis of two Scandinavian models showed that older allometric regression models may give biased estimates due to changed growth conditions. More biomass can be stored in forest stands where competition between trees is stronger. The tree biomass calculation methods used in different countries have also substantial influence on the estimates at stand-level. A common database of forest biomass measurements from Europe in similar to pan-tropical tree measurement data may be helpful to harmonise carbon accounting methods.

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“…In South Korea, research on Quercus acuta addresses Suitable land for afforestation, diameter and height growth, carbon storage, thinning effect, and community structure, and recently the development of tree volume tables that serve as a standard for timber production and trade (Kim et al, 2000;Lee et al, 2005;Hwang et al, 2006;Park et al, 2015;Jung et al, 2015Jung et al, , 2023. Quercus acuta is a warm temperate Evergreen broad-leaved tree species that has high utility value as a future tree species that can respond to global warming and create secondary growth forests in large-scale areas damaged by pine wilt disease and forests disturbed by typhoons.…”

mentioning

confidence: 99%

Development of the Site Index Curves for <italic>Quercus acuta</italic> Stands

Jung,

Lee,

Kim

et al. 2023

J. People Plants Environ

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Background and objective: The purpose of this study is to develop a model for estimating the site index (SI), which is the criterion for determining the site productivity of the Quercus acuta stand as known as Evergreen broad-leaved tree (EBLT) species.Methods: The materials used in the analysis were data from 63 sample plots, and the sample plots data were collected from the National Forest Inventory (NFI) and other sites. Since the site index is determined by the height and stand age of the dominant trees, the Schumacher model, the Chapman-Richards model, and the Weibull model were applied to derive the optimal equation for estimating the dominant tree height.Results: The three models derived the parameters and went through a statistical test. Among the three models, the Chapman-Richards model was found to be optimal considering the fitness index, bias, and residuals. By transforming this model, site index estimation equations with the reference age of 30 years were created, and site index curves were derived. According to the analysis of the collected data, the site index of the Quercus acuta stand in Korea was found to be in the range of 10 to 16.Conclusion: As the growth distribution of Quercus acuta is expected to move north due to climate change, the derivation of the site index representing site productivity will be helpful in making policy and management decisions for this species.

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Thinning Intensity and Growth Response in a Quercus acuta Stand

Cited by 3 publications

References 6 publications

Development of Diameter Growth Models by Thinning Intensity of Planted Quercus glauca Thunb. Stands

Development of Diameter Growth Models by Thinning Intensity of Planted Quercus glauca Thunb. Stands

Estimation of above-ground biomass in forest stands from regression on their basal area and height

Development of the Site Index Curves for <italic>Quercus acuta</italic> Stands

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Thinning Intensity and Growth Response in a Quercus acuta Stand

Cited by 3 publications

References 6 publications

Development of Diameter Growth Models by Thinning Intensity of Planted Quercus glauca Thunb. Stands

Development of Diameter Growth Models by Thinning Intensity of Planted Quercus glauca Thunb. Stands

Estimation of above-ground biomass in forest stands from regression on their basal area and height

Development of the Site Index Curves for &lt;italic&gt;Quercus acuta&lt;/italic&gt; Stands

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Development of the Site Index Curves for <italic>Quercus acuta</italic> Stands