Larix gmelinii var.principis-rupprechtii(Mayr.)Pilger is an important native tree species in North China with advantages of fast growth,straight trunk,and good wood properties.The multi-year and multi-site breeding re...Larix gmelinii var.principis-rupprechtii(Mayr.)Pilger is an important native tree species in North China with advantages of fast growth,straight trunk,and good wood properties.The multi-year and multi-site breeding research of families of the species has not been reported previously.Based on diameter at breast height(DBH),height and volume of 25 families on four experimental sites,we calculated variance components,genetic parameters,juvenile and mature trait correlations and made genotype main effect plus genotype×environment interaction effect(GGE)biplot based on the breeding values estimated using the method of best linear unbiased prediction(BLUP).Compared with height,DBH and volume had higher heritability and larger variation coefficients,making them the more suitable traits for family selection and evaluation.Based on these,GGE biplots containing 20 combinations of site×age were drawn using data at 13 to 17 years when the interactions between family and location were strong.Test sites classifications based on DBH,and volume were inconsistent,with two categories for DBH and one for volume.The Guyuan site was the most suitable with strong discriminating ability,high representativeness and stability among tree ages.Integrating the ranking results of DBH and volume,families 66,76,82 and 111 were high-yielding and stable,families 78 and96 were high-yielding with above average stability,families72 and 79 were high-yielding with below average stability,whereas stability of family 100 was inconsistent between DBH and volume.Early selection based on DBH was convenient and reliable,and can be made at seven years.This study provides support for the selection of Larix gmelinii var.principis-rupprechtii families in Hebei province and an example for the application of stem analysis data from multiple sites in tree breeding.展开更多
Global warming has changed the distributions of forests of northeastern China.Larix are very important species in this area.Predicting the potential distributions of Larix species and their responses to climate change...Global warming has changed the distributions of forests of northeastern China.Larix are very important species in this area.Predicting the potential distributions of Larix species and their responses to climate change would attract more and more attention.This paper predicted the potential distributions of three Larix species based on‘climatic-topographic’relationships by logistic regression.The results showed that L.gmelinii is predicted to retreat northwestward by 220 km by 2050 and by 270 km more by 2100;L.olgensis var.changpaiensis is predicted to retreat northwestward by 200 km by 2050 and by 190 to 300 km more by 2100;L.principis-rupprechtii is predicted to retreat northeastward by 200 km by 2050 and by 250 to 400 km more by 2100.This indicated that L.gmelinii could have its optimum latitude moved into Russia,L.olgensis var.changpaiensis could move to the Small Xing’an Mountains and L.principisrupprechtii would move to the middle part of the Great Xing’an Mountains.展开更多
基金supported by the Key Research and Development Program of Hebei Province[20326333D]Science and Technology Promotion Demonstration Project of forestry and grassland in Hebei Province[Hebei TG[2019]001]Science and Technology Promotion Demonstration Project of forestry and grassland in Hebei Province[Hebei TG[2020]013]。
文摘Larix gmelinii var.principis-rupprechtii(Mayr.)Pilger is an important native tree species in North China with advantages of fast growth,straight trunk,and good wood properties.The multi-year and multi-site breeding research of families of the species has not been reported previously.Based on diameter at breast height(DBH),height and volume of 25 families on four experimental sites,we calculated variance components,genetic parameters,juvenile and mature trait correlations and made genotype main effect plus genotype×environment interaction effect(GGE)biplot based on the breeding values estimated using the method of best linear unbiased prediction(BLUP).Compared with height,DBH and volume had higher heritability and larger variation coefficients,making them the more suitable traits for family selection and evaluation.Based on these,GGE biplots containing 20 combinations of site×age were drawn using data at 13 to 17 years when the interactions between family and location were strong.Test sites classifications based on DBH,and volume were inconsistent,with two categories for DBH and one for volume.The Guyuan site was the most suitable with strong discriminating ability,high representativeness and stability among tree ages.Integrating the ranking results of DBH and volume,families 66,76,82 and 111 were high-yielding and stable,families 78 and96 were high-yielding with above average stability,families72 and 79 were high-yielding with below average stability,whereas stability of family 100 was inconsistent between DBH and volume.Early selection based on DBH was convenient and reliable,and can be made at seven years.This study provides support for the selection of Larix gmelinii var.principis-rupprechtii families in Hebei province and an example for the application of stem analysis data from multiple sites in tree breeding.
基金China’s Natural Science Foundation(40331008)the Innova-tion Program of the Chinese Academy of Science(KSCX2-SW-133)+1 种基金the Key Technology and Demonstration on Forestry Eco-logical Building Project(2006BAD03A09)the National 863 Plans Project(2006AA10Z251).
文摘Global warming has changed the distributions of forests of northeastern China.Larix are very important species in this area.Predicting the potential distributions of Larix species and their responses to climate change would attract more and more attention.This paper predicted the potential distributions of three Larix species based on‘climatic-topographic’relationships by logistic regression.The results showed that L.gmelinii is predicted to retreat northwestward by 220 km by 2050 and by 270 km more by 2100;L.olgensis var.changpaiensis is predicted to retreat northwestward by 200 km by 2050 and by 190 to 300 km more by 2100;L.principis-rupprechtii is predicted to retreat northeastward by 200 km by 2050 and by 250 to 400 km more by 2100.This indicated that L.gmelinii could have its optimum latitude moved into Russia,L.olgensis var.changpaiensis could move to the Small Xing’an Mountains and L.principisrupprechtii would move to the middle part of the Great Xing’an Mountains.
