Tree-ring chronology of Larix gmelinii (Dahurian larch) compiled from tree samples IKONLAGM

Dahurian larch (Larix gmelinii Rupr.), Korean spruce (Picea koraiensis Nakai), and Manchurian fir (Abies nephrolepis Maxim) are valuable tree species of northeast China. Management tools are required for these species to support the industrial and ecological development of forest ecosystems of China. This study aimed to develop taper equations for these species. Five well-known taper equations from two groups (segmented and variable form taper models) were evaluated using the fixed- and mixed-effect modeling. The models were independently fitted utilizing diameter and height datasets comprising 473 trees. A third-order continuous autoregressive error structure (CAR (3)) was used to account for autocorrelation. The model of Clark et al. (1991. Stem profile equations for southern tree species. Asheville, NC: USDA Forest Service. Research Paper, SE-282. doi:10.2737/SE-RP-282) was superior to other models for estimating diameter, merchantable volume, and stem volume when upper stem diameter at 5.3 m was available or predicted. After model comparison, the best Clark et al. (1991) model was refitted as a nonlinear mixed-effects model. This study also demonstrated that the fixed-effect model of Clark et al. (1991) was more accurate than Kozak (2004) mixed model when the later was calibrated for upper stem diameter at 5.3 m with validation data.

Larix gmelinii

10.1080/02827581.2020.1843703

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Tree-ring measurements of Larix sibirica (Siberian larch) from sample VISHERLS-102

Fritz Hans Schweingruber Dimitry Zahargevsky

Sample (material)

Larix gmelinii

10.1594/pangaea.599975

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Tree-ring measurements of Larix sibirica (Siberian larch) from sample KHADULA-71

Fritz Hans Schweingruber

Larix gmelinii

Sample (material)

10.1594/pangaea.593338

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EVALUATION OF REGION AND SUBREGION-BASED HEIGHTDIAMETER MODELS FOR DAHURIAN LARCH (LARIX GMELINII) IN DAXING’AN MOUNTAINS IN CHINA

Applied Ecology and Environmental Research (2019)

G Y ENZINGA L.C. JIANG

Using the felled tree data, subregions-based height-diameter models were developed for Dahurian larch (Larix gmelinii Rupr) in Daxing'an Mountains in China.Thirty frequently used nonlinear growth functions were fitted to individual tree height-diameter data.A total of 2411 for Dahurian larch trees were collected and measured.Parameter estimates and evaluation statistics were calculated using SAS PROC NLIN procedure for overall model, three regional models, and ten subregional models.The non-linear extra sum of squares method was used to assimilate the difference of the height-diameter relationships among different subregions.The results indicate that the Chapman-Richards growth function show the best for fitting tree height-diameter relationships at regional and subregional levels with a root mean square error RMSE = 2.193 and coefficient determination R 2 = 0.8221.It was revealed that, Dahurian larch height-diameter relationships showed the several differences among these regions and subregions (P < 0.0001) when overall, regional and subregional model was applied to predict tree height separately in each region and subregion.Among the 45 pairs of subregions, only four subregion pairs (e.g., XL versus SBZ, XL versus HJY, SBZ versus HJY, and XL versus JGDQ) showed the nonsignificant difference F-value (P > 0.05) and the data from those subregions were combined and applied to others subregions; all comparisons show the difference.The tree height-diameter relationships of Dahurian larch are significantly different among the geographic regions in Daxing'an Mountains, depending on local climatic, soil, and ecological conditions.

Larix gmelinii

Tree (set theory)

10.15666/aeer/1706_1356713591

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Tree-ring measurements of Larix sibirica (Siberian larch) from sample PINEGALA-42

Fritz Hans Schweingruber Martin Häfliger

Sample (material)

Larix gmelinii

10.1594/pangaea.596611

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