Radial growth response of Pinus densiflora and Quercus spp. to topographic and climatic factors in South Korea

Byun, Jae Gyun; Lee, Woo‐Kyun; Kim, Moonil; Kwak, Do Won; Kwak, Han Deok; Park, Taejin; Byun, Woo Hyuk; Son, Yowhan; Choi, Jung Kee; Lee, Young Jin; Saborowski, Joachim; Chung, Dong Jun; Jung, Jin Hyun

doi:10.1093/jpe/rtt001

Cited by 43 publications

(44 citation statements)

References 59 publications

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“…It is stated in various papers that GAMs are capable of describing strongly nonlinear relationships occurring in an ecosystem (Byun et al 2013) and also the behaviour of biological processes (Frescino et al 2001;Austin 2002;Lehmann et al 2003). This was only partially confirmed in our study because only the LOESS-based model was ecologically plausible and capable of modelling the nonlinear relationship of local scale height curve.…”

Section: Discussionsupporting

confidence: 64%

“…Wang et al (2005) reported that GAMs are more resistant to extreme values than other linear or nonparametric methods. The same conclusions were reached by Byun et al (2013) in their paper. Moisen et al (2006) pointed to the fact that in addition to fitting quality, GAMs are easy to interpret.…”

supporting

confidence: 83%

“…In forestry, this modelling technique can be encountered in a range of applications over the past few years, e.g. in the papers of Falk and Mellert (2011) and Kouba and Alados (2012), who dealt with the modelling of spatial dynamics of tree species, Wang et al (2005), Albert and Schmidt (2010) and Aertsen et al (2012), who discussed the site-specific production capacity, Robinson et al (2011) and Kuželka and Marušák (2014), who modelled the stem form or Byun et al (2013), who modelled the diameter growth of trees or Zhang et al (2008) and Schmidt et al (2011), who modelled exactly height curves of various tree species, but used only different spline functions without using the LOESS function. Based on previous statements, three key advantages suggest to prefer a GAM instead of a classic height curve: (i) higher flexibility of the model, (ii) robustness against outliers, (iii) no usage limitations as in the case of OLS regression (normality or independence of residuals).…”

mentioning

confidence: 99%

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Generalized additive models as an alternative approach to the modelling of the tree height-diameter relationship

Adamec¹,

Drápela²

2015

J. For. Sci.

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Generalized additive models were tested using three types of smoothing functions as an alternative for modelling the height curve. The models were produced for 23 forest stands of Norway spruce (Picea abies [L.] Karst.) in the territory of the Training Forest Enterprise Masaryk Forest Křtiny. The results show that the best evaluated and recommended for practical use at the level of forest stand was the LOESS function (locally weighted scatterplot smooting) when using a greater width of the bandwidth. Due to the frequent overfitting and the associated unrealistic behaviour of the function, smoothing by spline functions cannot be recommended for modelling the height curve at the level of forest stand. It was validated that the resulting model must be assessed not only according to the calculated quality criteria, but also depending on the graphic pattern of the model which must ensure that the height curve pattern is realistic. The quality of the resulting models (with LOESS function) was assessed to be high, mainly due to the very precise determination of model heights.

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Section: Discussionsupporting

confidence: 64%

supporting

confidence: 83%

mentioning

confidence: 99%

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Generalized additive models as an alternative approach to the modelling of the tree height-diameter relationship

Adamec¹,

Drápela²

2015

J. For. Sci.

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“…Using MC1, Choi et al [26] predicted 40% change for different forest tree species. Byun et al [56], stated that because of climate change, the growth of Pinus densiflora will decrease and that of Quercus spp. will increase.…”

Section: Discussionmentioning

confidence: 99%

Spatio-temporal change in forest cover and carbon storage considering actual and potential forest cover in South Korea

Nam

Lee

Kim

et al. 2015

Sci. China Life Sci.

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This study analyzes change in carbon storage by applying forest growth models and final cutting age to actual and potential forest cover for six major tree species in South Korea. Using National Forest Inventory data, the growth models were developed to estimate mean diameter at breast height, tree height, and number of trees for Pinus densiflora, Pinus koraiensis, Pinus rigida, Larix kaempferi, Castanea crenata and Quercus spp. stands. We assumed that actual forest cover in a forest type map will change into potential forest covers according to the Hydrological and Thermal Analogy Groups model. When actual forest cover reaches the final cutting age, forest volume and carbon storage are estimated by changed forest cover and its growth model. Forest volume between 2010 and 2110 would increase from 126.73 to 157.33 m 3 hm −2. Our results also show that forest cover, volume, and carbon storage could abruptly change by 2060. This is attributed to the fact that most forests are presumed to reach final cutting age. To avoid such dramatic change, a regeneration and yield control scheme should be prepared and implemented in a way that ensures balance in forest practice and yield. climate change, final cutting age, carbon storage, national forestry inventory, forest growth model Citation:Nam K, Lee WK, Kim M, Kwak DA, Byun WH, Yu H, Kwak H, Kwon T, Sung J, Chung DJ, Lee SH. Spatio-temporal change in forest cover and carbon storage considering actual and potential forest cover in

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“…Managing larch forests is one of the primary challenges in Korean forestry, because Japanese larch (L. kaempferi) has been widely used for national reforestation programs since 1960s , Kim et al 2015b). Meanwhile, oak stands have also received growing attentions because increases in air temperature and the abundance of pine wood nematode, both of which could result from climate change, have been predicted to accelerate the succession of coniferous stands to oak-dominated deciduous stands in Korea (Byun et al 2013, Kwak et al 2012. The management of oak stands has, therefore, become another important challenge for Korean forestry from the perspective of climate change adaptation.…”

Section: Introductionmentioning

confidence: 99%

Impact of thinning on carbon storage of dead organic matter across larch and oak stands in South Korea

Kim¹,

Han²,

Lee³

et al. 2016

iForest

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(1-4) Dead organic matter is important in carbon (C) sequestration because it accounts for a significant proportion of forest C storage. As thinning could alter the C storage of dead organic matter, this study aimed to assess the effect of thinning on the C storage of dead organic matter including the forest floor, mineral soil at a depth of 0-30 cm, and coarse woody debris in larch and oak forests in South Korea. Differing intensities of thinning were applied to four larch and four oak stands, and the C storage of dead organic matter in thinned and control plots was compared three years after thinning. The effect sizes were estimated based on Hedges' d to measure the influence of thinning. Total C storage of dead organic matter tended to be higher in the thinned plots (larch: 82. ). However, estimation of effect size found that the cumulative effect size was not significant for the C storage of the forest floor, mineral soil, coarse woody debris, and dead organic matter. Only a few of the individual treatments exhibited significant effect sizes for mineral soil C storage in two larch stands and coarse woody debris C storage in two oak stands. The results indicated that the applied thinning treatments might have no consistently significant impact on the C storage of dead organic matter in the larch and oak stands after three years, though thinning may have had an idiosyncratic influence on the C storage of dead organic matter in a few of the study stands.

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Radial growth response of Pinus densiflora and Quercus spp. to topographic and climatic factors in South Korea

Cited by 43 publications

References 59 publications

Generalized additive models as an alternative approach to the modelling of the tree height-diameter relationship

Generalized additive models as an alternative approach to the modelling of the tree height-diameter relationship

Spatio-temporal change in forest cover and carbon storage considering actual and potential forest cover in South Korea

Impact of thinning on carbon storage of dead organic matter across larch and oak stands in South Korea

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