scholarly journals Genetic Variation in Growth and Cone Traits of Pinus Koraiensis Half-Sib Families in Northeast China

Phyton ◽  
2020 ◽  
Vol 89 (1) ◽  
pp. 57-69
Author(s):  
David Kombi Kaviriri ◽  
Xiaoting Liu ◽  
Zuoyi Fan ◽  
Jingyuan Wang ◽  
Qi Wang ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Northeast China ◽  
Pinus Koraiensis ◽  
Sib Families

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.

Variation in acid tolerance of Connecticut wood frogs: genetic and maternal effects

1985 ◽  
Vol 63 (7) ◽  
pp. 1647-1651 ◽  
Author(s):  
Benjamin A. Pierce ◽  
Nalin Sikand
Keyword(s):  
Genetic Variation ◽  
Acidic Solution ◽  
Acid Tolerance ◽  
Rana Sylvatica ◽  
Larval Survival ◽  
Wood Frog ◽  
Maternal Factors ◽  
Wood Frogs ◽  
Significant Difference ◽  
Sib Families

Acid tolerance in wood frog (Rana sylvatica) embryos and larvae was examined in full- and half-sib families. Among the embryos, no significant difference in acid tolerance at pH 3.75 was observed among the progeny of males. At pH 4 only slight differences in embryo acid tolerance existed among the progeny of males mated to the same female. Thus, there is relatively little direct genetic variation in embryo acid tolerance. However, progeny from different females differed significantly in their acid tolerance at both pH 4 and pH 3.75, indicating that maternal factors are important in embryo acid tolerance. Whether these maternal factors are genetic is not known. Among larvae, maternal factors did not appear to influence acid tolerance, but significant genetic variation was present. Larval survival in an acidic solution was not correlated with embryo acid tolerance.

Genetic variation in carbon isotope discrimination and its relationship to growth under field conditions in full-sib families of Piceamariana

1995 ◽  
Vol 25 (1) ◽  
pp. 39-47 ◽  
Author(s):  
Lawrence B. Flanagan ◽  
Kurt H. Johnsen
Keyword(s):  
Genetic Variation ◽  
Carbon Isotope ◽  
Carbon Isotope Discrimination ◽  
Isotope Composition ◽  
Stable Carbon Isotope ◽  
Leaf Tissue ◽  
Tree Height ◽  
Strong Negative Correlation ◽  
Isotope Discrimination ◽  
Sib Families

Measurements of the stable carbon isotope composition of leaf tissue were made on Piceamariana (Mill.) B.S.P trees from four full-sib families grown on three different field sites at the Petawawa National Forestry Institute, Ontario, Canada. The four families chosen exhibited genetic variation for growth characteristics. Genetic variation was also observed for carbon isotopic discrimination (Δ) among the families of P. mariana. In addition, a strong correlation occurred between Δ values measured on trees in 1991 and 1992, two years that had very different precipitation and temperature conditions during the growing season, indicating that the ranking of individual trees remained almost constant between years. A strong, negative correlation was observed between average carbon isotope discrimination and average tree height for the four families on the driest, least productive site, as was expected based on leaf photosynthetic characteristics. There was no significant correlation, however, between Δ values and growth on the other two study sites, where productivity was higher.

Genetic variation in wood specific gravity among half-sib families of chir pine (Pinus roxburghii sargent)

New Forests ◽  
2010 ◽  
Vol 40 (2) ◽  
pp. 213-227
Author(s):  
Anup Raj ◽  
R. N. Sehgal ◽  
K. R. Sharma ◽  
Punam K. Sharma
Keyword(s):  
Genetic Variation ◽  
Specific Gravity ◽  
Pinus Roxburghii ◽  
Wood Specific Gravity ◽  
Sib Families ◽  
Chir 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.

scholarly journals Quantitative Trait Loci Variation for Growth and Obesity Between and Within Lines of Pigs (Sus scrofa)

Genetics ◽  
2003 ◽  
Vol 164 (2) ◽  
pp. 629-635 ◽  
Author(s):  
Yoshitaka Nagamine ◽  
Chris S Haley ◽  
Asheber Sewalem ◽  
Peter M Visscher
Keyword(s):  
Genetic Variation ◽  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Sus Scrofa ◽  
Strong Support ◽  
Wild Type ◽  
Porcine Genome ◽  
Trait Loci ◽  
Sib Families ◽  
Related Population

Abstract The hypothesis that quantitative trait loci (QTL) that explain variation between divergent populations also account for genetic variation within populations was tested using pig populations. Two regions of the porcine genome that had previously been reported to harbor QTL with allelic effects that differed between the modern pig and its wild-type ancestor and between the modern pig and a more distantly related population of Asian pigs were studied. QTL for growth and obesity traits were mapped using selectively genotyped half-sib families from five domesticated modern populations. Strong support was found for at least one QTL segregating in each population. For all five populations there was evidence of a segregating QTL affecting fatness in a region on chromosome 7. These findings confirm that QTL can be detected in highly selected commercial populations and are consistent with the hypothesis that the same chromosome locations that account for variation between populations also explain genetic variation within populations.

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.

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