Modeling the height-diameter relationship of planted Pinus kesiya in Zambia

Ng’andwe, P.; Chungu, Donald; Yambayamba, Arthur M.; Chilambwe, Alice

doi:10.1016/j.foreco.2019.05.051

Cited by 23 publications

(13 citation statements)

References 36 publications

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“…We followed established procedures during fitting, parameterization and validation [5], [9], [10]. For more information please see “Modeling the height-diameter relationship of planted Pinus kesiya in Zambia” [1].…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

“…We again used the mean relative error (MRE) and MAPE to evaluate the performance of site-specific modes. Models that passed this final step were considered for h estimation at the site and/or rotation level for P.kesiya in Zambia [1]. Equations used in the evaluation process are detailed in Table 5.…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

“…the year when trees were planted in the field to the year when the inventory was conducted. We used 7,691 trees with complete h and d pairs in model development [1]. The data composition in each group is presented in Fig.…”

Section: Datamentioning

confidence: 99%

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Data on tree height and diameter for Pinus kesiya in Zambia

et al. 2019

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Forest inventories in plantations of non-native trees are conducted every five years in Zambia. Characteristics of data collected through these inventories are presented here. The data includes diameter at breast height ( d ), total tree height ( h) and rotation categories for trees sampled. This data supported the development of robust h-d models for planted Pinus kesiya in the country. We have also presented graphical visualization of the composition and trends of the data by site and rotation. Datasets were filtered and cleaned and are ready to be used for other purposes in order to improve understanding of P. kesiya growth. For more insight please see “Modeling the height-diameter relationship of planted Pinus kesiya in Zambia” (Ng’andwe et al., 2019).

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Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

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Data on tree height and diameter for Pinus kesiya in Zambia

et al. 2019

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“…Substantial research has been conducted to explore the H-DBH relationship. Various linear and nonlinear models such as logarithmic, exponential and logistic models have been developed (Huang and Titus 1992;Larsen and Hann 1987;Amaro et al 1998;de Mendonca et al 2011;Fekedulengn et al 1999;Fast et al 2011;Phillimon et al 2019;Sharma 2009;Yuancai and Parresol 2001). In the models, when DBH is used as the only independent variable to predict tree H, the percentage error of predicted H values often varies from 10% to 20% and the prediction accuracy is acceptable.…”

Section: Introductionmentioning

confidence: 99%

Influence of slope, aspect and competition index on the height-diameter relationship of Cyclobalanopsis glauca trees for improving prediction of height in mixed forests

Long¹,

Si-qi²,

Falin³

et al. 2020

Silva Fenn.

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Diameter at breast height (DBH) and height (H) of trees are two important variables used in forest management plans. However, collecting the measurements of H is time-consuming and costly. Instead, the H-DBH relationship is modeled and used to estimate H. But, ignoring the effects of slope, aspect and tree competition on the H-DBH relationship often impedes the improvement of H predictions. In this study, to improve predictions of (Thunb.) Oerst. tree H in mixed forests, we compared eleven H-DBH models and examined the influence of slope and aspect on the H-DBH relationship using 426 trees. We then improved Hegyi competition index and explored its effect on the H predictions by including it in the selected models. Results showed 1) There were statistically significant effects of slope and aspect on the H-DBH relationship; 2) The log transformation and exponential model performed best for sunny- and shady-steep, respectively, and the Gompertzâs model was optimal for both sunny- and shady-gentle; 3) Compared with the whole dataset, the division of the data into the slope and aspect sub-datasets significantly reduced the RMSE of H predictions; 4) Compared with the selected models without competition index, adding the original Hegyi and improved Hegyi_I into the models improved the H predictions but only the models containing the improved Hegyi_I significantly increased the prediction accuracy at the significant level of 0.1. This study implied that modeling the H-DBH relationship under different slopes and aspects and including the improved Hegyi_I provided the great potential to improve the H predictions.Cyclobalanopsis glauca

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“…Liang, P. et al [31] found that forest height was important in shaping the altitudinal change in radial growth response to climate change, which indicates that forest height can reflect the status of the stand. Many scholars have attempted to model the height-diameter relationship [29,30,[32][33][34][35][36][37] and then estimate stand volume by fitting a related model. Such models can aid in formulating forest management measures [36,38].…”

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confidence: 99%

Comparing the Stand Structure of a Secondary Mixed Forest with Three Broad-Leaved Forests in China’s Greater Khingan Mountains

Guan¹,

Dong²,

Tian³

et al. 2020

Pol. J. Environ. Stud.

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There is a general consensus that mixed forests offer ecological and productivity advantages over singlespecies forests in most situations, e.g., higher habitat heterogeneity, high water-holding capacity, and greater diversity of species composition [1][2][3][4]. Meanwhile, studies have explored ways to convert pure plantations into mixed forests [5]. Nevertheless, for secondary forests, including those resulting from deforestation and damage by natural hazards, few studies exist, and still fewer compare mixed stands with pure tree species stands.Historically the Greater Khingan Mountains were rich in forest resources. However, due to severe damage from wildfires, especially in 1987, and continuous deforestation due to logging over many years, the forest status has been degraded, resulting in higher rates of

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Modeling the height-diameter relationship of planted Pinus kesiya in Zambia

Cited by 23 publications

References 36 publications

Data on tree height and diameter for Pinus kesiya in Zambia

Data on tree height and diameter for Pinus kesiya in Zambia

Influence of slope, aspect and competition index on the height-diameter relationship of Cyclobalanopsis glauca trees for improving prediction of height in mixed forests

Comparing the Stand Structure of a Secondary Mixed Forest with Three Broad-Leaved Forests in China’s Greater Khingan Mountains

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