Reproductive traits and their correlation among woody plants in a broadleaf-Korean pine (<italic>Pinus koraiensis</italic>) mixed forest in Northeast China

2014 ◽  
Vol 59 (24) ◽  
pp. 2407-2415 ◽  
Author(s):  
YunYun WANG ◽  
ZhanQing HAO ◽  
Ji YE ◽  
Fei LIN ◽  
XuGao WANG ◽  
...  
Keyword(s):  
Woody Plants ◽  
Northeast China ◽  
Mixed Forest ◽  
Reproductive Traits ◽  
Pinus Koraiensis ◽  
Korean Pine

scholarly journals Height-diameter relationship for Pinus koraiensis in Mengjiagang Forest Farm of Northeast China using nonlinear regressions and artificial neural network models

2019 ◽  
Vol 65 (No. 4) ◽  
pp. 134-143 ◽  
Author(s):  
Tuan Nguyen Thanh ◽  
Tai Dinh Tien ◽  
Hai Long Shen
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Northeast China ◽  
Tree Height ◽  
Pinus Koraiensis ◽  
Accurate Estimation ◽  
Korean Pine ◽  
Ann Models ◽  
Artificial Neural ◽  
Forest Farm

Korean pine (Pinus koraiensis Sieb. et Zucc.) is one of the highly commercial woody species in Northeast China. In this study, six nonlinear equations and artificial neural network (ANN) models were employed to model and validate height-diameter (H-DBH) relationship in three different stand densities of one Korean pine plantation. Data were collected in 12 plots in a 43-year-old even-aged stand of P. koraiensis in Mengjiagang Forest Farm, China. The data were randomly split into two datasets for model development (9 plots) and for model validation (3 plots). All candidate models showed a good perfomance in explaining H-DBH relationship with error estimation of tree height ranging from 0.61 to 1.52 m. Especially, ANN models could reduce the root mean square error (RMSE) by the highest 40%, compared with Power function for the density level of 600 trees. In general, our results showed that ANN models were superior to other six nonlinear models. The H-DBH relationship appeared to differ between stand density levels, thus it is necessary to establish H-DBH models for specific stand densities to provide more accurate estimation of tree height.

Functional and phylogenetic structures of woody plants in broad-leaved Korean pine mixed forest in Changbai Mountains, Jilin, China

2014 ◽  
Vol 59 (24) ◽  
pp. 2342-2348
Author(s):  
Shuai FANG ◽  
Fei LIN ◽  
XuGao WANG ◽  
ZhanQing HAO ◽  
ZuoQiang YUAN ◽  
...  
Keyword(s):  
Woody Plants ◽  
Mixed Forest ◽  
Changbai Mountains ◽  
Korean Pine

scholarly journals Height Growth of Korean Pine Seedlings Planted under Strip-Cut Larch Plantations in Northeast China

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Toshiaki Owari ◽  
Shinichi Tatsumi ◽  
Liangzhi Ning ◽  
Mingfang Yin
Keyword(s):  
Northeast China ◽  
Mixed Model ◽  
Linear Mixed Model ◽  
Height Growth ◽  
Pinus Koraiensis ◽  
Stand Age ◽  
Seedling Height ◽  
Korean Pine ◽  
Open Site ◽  
Pine Seedlings

To develop two-storied forest management of larch plantations in Northeast China, this study examined the height growth of Korean pine (Pinus koraiensisSieb. et Zucc.) seedlings planted under strip-cut larch canopies. We measured the height growth of the underplanted seedlings 4 years after planting. The larch canopies were of varying stand age (12, 17, and 37 years) and strip-cut width (4.5, 6.0, and 7.5 m). We measured the seedling height growth in an open site (i.e., a site with no canopy). Underplanted seedlings had a smaller height growth (12.1–20.1 cm year−1) than the seedlings planted in the open site (23.7 cm year−1). The seedlings underplanted in the wider strip-cuts tended to have greater height growth than the seedlings underplanted in the narrowest strip-cuts. A generalized linear mixed model analysis predicted the greatest seedling height growth in the open site. A 36–47% reduction in annual height growth was predicted for the narrowest strip-cuts (4.5 m) versus the open site, while a 13–36% reduction in annual height growth was predicted for the wider strip-cuts (6.0–7.5 m) versus the open site. To maintain adequate height growth, forest managers are recommended to create wider strip-cuts (i.e., ≥6.0 m) for the purpose of underplanting Korean pine seedlings in larch plantations.

Effects of logging intensity on structure and composition of a broadleaf-Korean pine mixed forest on Changbai Mountains, northeast China

2015 ◽  
Vol 26 (1) ◽  
pp. 59-67 ◽  
Author(s):  
Zhijun Wu ◽  
Dongkai Su ◽  
Lijun Niu ◽  
Bernard Joseph Lewis ◽  
Dapao Yu ◽  
...  
Keyword(s):  
Northeast China ◽  
Mixed Forest ◽  
Changbai Mountains ◽  
Korean Pine

Photosynthesis, leaf morphology and chemistry of Pinus koraiensis and Quercus mongolica in broadleaved Korean pine mixed forest

2012 ◽  
Vol 50 (1) ◽  
pp. 56-66 ◽  
Author(s):  
X. B. Cheng ◽  
J. Wu ◽  
S. J. Han ◽  
Y. M. Zhou ◽  
X. X. Wang ◽  
...  
Keyword(s):  
Leaf Morphology ◽  
Mixed Forest ◽  
Pinus Koraiensis ◽  
Korean Pine ◽  
Quercus Mongolica

Spatial Variability in Physical Soil Properties in a Pinus koraiensis-Dominated Broadleaved Mixed Forest Gap in Xiao Xing’an Mountains of Northeast China

2012 ◽  
Vol 518-523 ◽  
pp. 4761-4765
Author(s):  
Wen Biao Duan ◽  
Yan Li ◽  
Li Xin Chen
Keyword(s):  
Spatial Variability ◽  
Soil Properties ◽  
Northeast China ◽  
Interactive Effect ◽  
Mixed Forest ◽  
Grid Method ◽  
Spatial Distance ◽  
Pinus Koraiensis ◽  
Forest Gap ◽  
Anisotropic Structures

Locations of sampling points in Pinus koraiensis-dominated broadleaved mixed forest gap in Xiao Xing’an Mountains of Northeast China were determined by grid method. Spatial variability in physical soil properties (PSPs) at those locations in 2 depths of 0–20 cm and 20–40 cm was analyzed by descriptive statistics and geostatistics. The results indicated that soil water content (SWC), saturated moisture capacity, capillary water-holding capacity and porosity were higher in 0–20 cm than in 20–40 cm except for bulk density. PSPs in 0–20 cm had relatively higher ranges and coefficients of variation. The total and autocorrelative spatial heterogeneity in PSPs were larger in 0–20 cm than in 20–40 cm. SWC had a strong anisotropic structure in an easterly and northerly direction, but porosity exhibited isotropy structure in the same directions. With increasing spatial distance, the three other PSPs presented anisotropic structures. Within spatial autocorrelative range, the interactive effect between semivariograms of PSPs in 0–20 cm was not significant. For spatial distribution of PSPs in 2 different depths, the patches with the middle and lower ranks dominated in the forest gap. Patches with higher rank were only distributed in 0–20 cm and were located north of the forest gap.

Characteristics of ecological stoichiometry in broad-leaved and Korean pine mixed forest and its response to latitude gradient in Northeast China

2018 ◽  
Vol 38 (11) ◽  
Author(s):  
李喜霞 LI Xixia ◽  
杜天雨 DU Tianyu ◽  
魏亚伟 WEI Yawei ◽  
周永斌 ZHOU Yongbin
Keyword(s):  
Northeast China ◽  
Ecological Stoichiometry ◽  
Mixed Forest ◽  
Korean Pine

Forest management of Korean pine and broadleaf mixed forest in Northeast China since the implementation of Natural Forest Protection Project

2015 ◽  
Vol 35 (1) ◽  
Author(s):  
于大炮 YU Dapao ◽  
周旺明 ZHOU Wangming ◽  
包也 BAO Ye ◽  
齐麟 QI Lin ◽  
周莉 ZHOU Li ◽  
...  
Keyword(s):  
Forest Management ◽  
Northeast China ◽  
Mixed Forest ◽  
Natural Forest ◽  
Korean Pine ◽  
Forest Protection ◽  
Natural Forest Protection

scholarly journals Structural and compositional responses to timber harvesting for an old-growth forest on Changbai Mountain, China – Short Communication

2008 ◽  
Vol 54 (No. 6) ◽  
pp. 281-286 ◽  
Author(s):  
H. Gu ◽  
L. Dai
Keyword(s):  
High Intensity ◽  
Vegetation Type ◽  
Mixed Forest ◽  
Basal Area ◽  
Timber Harvesting ◽  
Diameter Distribution ◽  
Pinus Koraiensis ◽  
Korean Pine ◽  
Important Species ◽  
Old Growth Forest

Broadleaved-Korean pine (<I>Pinus koraiensis</I>) mixed forest is a dominant native vegetation type in the eastern Eurasian Continent. We intended to examine the implications of high-intensity timber harvesting (ca 70% of stand volume) for the sustainable management of a mixed forest ecosystem. We measured trees at three sites: control without cutting, older-cut site cut in 1987 and newer-cut site (cutting in 1997). There were significant differences in structure and composition between these three sites in 2003. There were 4,441 trees of 14 species with basal area 56 m<sup>2</sup> at control plot, 6,314 trees of 16 species with basal area 9 m<sup>2</sup> at newer-cut site and 8,438 trees of 21 species with basal area 31 m<sup>2</sup> at older-cut site (all on the area of 1 ha). The high-intensity timber harvesting system helped promote natural regeneration and the growth of small trees but it also allowed light-demanding tree species to invade into the forest. Dominant position and suitable diameter distribution of economically important species (<I>Pinus koraiensis</I> and <I>Tilia amurensis</I>) were maintained across the three sites. The existing timber harvesting appears to consider short-term economic values to a larger extent than long-term ecological values. To manage the broadleaved-Korean pine mixed forest for both timber production and biodiversity conservation, timber-harvesting intensity must be lowered.

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