In this paper,the geographical distribution,community characteristics and DBH class structure of Picea neoveitchii Mast. population were investigated and analyzed by systematical and ecological approaches. In addition...In this paper,the geographical distribution,community characteristics and DBH class structure of Picea neoveitchii Mast. population were investigated and analyzed by systematical and ecological approaches. In addition,the endangered mechanism and the protection measures were put forward by analyzing the Picea neoveitchii Mast. resource distribution in Hubei Province to provide effective scientific basis for further research. The results showed that Picea neoveitchii Mast. was found in Baokang,Enshi,Shennongjia and Zhuxi of Hubei Province,there were 9 distribution points and only a wild forest was found in Baokang. The community of Baokang County was not rich in species composition and 32 species,29 genera and 21 families were examined. Meanwhile,temperate zone was the main flora element of this community,the phaenerophytes plant was most dominant and there were few hemicryptophytes and it lacked therophytes. In this community,Picea neoveitchii Mast. was in a dominant position,including lots of treelets,so the age structure of the population was growing.展开更多
This study represents a geographical approach to morphological variation of cones, needles and seeds in natural dragon spruce （Picea asperata Mast.） populations across western China and the relationship between morp...This study represents a geographical approach to morphological variation of cones, needles and seeds in natural dragon spruce （Picea asperata Mast.） populations across western China and the relationship between morphological traits and weather variation for the origins of populations. Significant differences were found for all cone, needle and seed traits among populations and trees within populations. The coefficients of variation in 2 higher latitude populations were higher than those in other populations in all traits except for needle width and seed width. Fairly high within-population variability was also detected for cone dry weight, seed dry weight and needle traits in this study. Cone length, cone width, cone dry weight, seed scale length, seed scale width and seed wing length were strongly positively intercorrelated. Seed length and seed dry weight showed a significantly positive correlation with seed wing length. And needle width showed a significant negative correlation with cone traits, seed scale length, seed wing length and seed length. The higher the annual mean temperature, the higher the average cone length. This study also revealed a negative linear dependence on latitude： the higher the latitude, the lower the population average seed length. Seed dry weight was positively and linearly related with altitude.展开更多
基金Supported By the Second National Investigation of Key Wild Plant Resources-Special Investigation of Picea neoveitchii Mast.Resources in Hubei Province
文摘In this paper,the geographical distribution,community characteristics and DBH class structure of Picea neoveitchii Mast. population were investigated and analyzed by systematical and ecological approaches. In addition,the endangered mechanism and the protection measures were put forward by analyzing the Picea neoveitchii Mast. resource distribution in Hubei Province to provide effective scientific basis for further research. The results showed that Picea neoveitchii Mast. was found in Baokang,Enshi,Shennongjia and Zhuxi of Hubei Province,there were 9 distribution points and only a wild forest was found in Baokang. The community of Baokang County was not rich in species composition and 32 species,29 genera and 21 families were examined. Meanwhile,temperate zone was the main flora element of this community,the phaenerophytes plant was most dominant and there were few hemicryptophytes and it lacked therophytes. In this community,Picea neoveitchii Mast. was in a dominant position,including lots of treelets,so the age structure of the population was growing.
文摘This study represents a geographical approach to morphological variation of cones, needles and seeds in natural dragon spruce （Picea asperata Mast.） populations across western China and the relationship between morphological traits and weather variation for the origins of populations. Significant differences were found for all cone, needle and seed traits among populations and trees within populations. The coefficients of variation in 2 higher latitude populations were higher than those in other populations in all traits except for needle width and seed width. Fairly high within-population variability was also detected for cone dry weight, seed dry weight and needle traits in this study. Cone length, cone width, cone dry weight, seed scale length, seed scale width and seed wing length were strongly positively intercorrelated. Seed length and seed dry weight showed a significantly positive correlation with seed wing length. And needle width showed a significant negative correlation with cone traits, seed scale length, seed wing length and seed length. The higher the annual mean temperature, the higher the average cone length. This study also revealed a negative linear dependence on latitude： the higher the latitude, the lower the population average seed length. Seed dry weight was positively and linearly related with altitude.
