With annual Bischofia javanica seedlings as experimental material, the plasticity and comprehensive evaluation methods were employed to investigate the effects of different shading degrees （100% NS （natural sunshine...With annual Bischofia javanica seedlings as experimental material, the plasticity and comprehensive evaluation methods were employed to investigate the effects of different shading degrees （100% NS （natural sunshine）, 41.3% NS, 14.6% NS and 3.6% NS） on B. javanica seedlings growth, so as to obtain the shade toler- ance in B. javanica. The results showed that with the shading degree increasing, the seedling height increment, diameter increment, leaf area, fresh weights （above- ground part, underground part and whole plant） and dry weights （aboveground part, underground part and whole plant） of B. javanica seedlings all increased first and then decreased, and reached peak values under 41.3% NS, while the total root length, average root diameter, total surface area, total root volume and total root number all presented a decreasing trend. Also the comprehensive evaluation by subordinate function value method and plasticity analysis were carried out on these growth indexes. It was concluded that B. javanica seedlings have medium shade tol- erance from the comDrehensive analysis of growth indexes.展开更多
The essential oil was extracted from fresh leaf and defoliation of Bischofia polycarpa(Lévl.) Airy Shaw using steam distillation,and the chemical components and relative content of essential oil were analyzed by ...The essential oil was extracted from fresh leaf and defoliation of Bischofia polycarpa(Lévl.) Airy Shaw using steam distillation,and the chemical components and relative content of essential oil were analyzed by GC-MS and peak area normalization.The results show that the yields of crude extracts of essential oil from fresh leaf and defoliation are 0.114% and 0.105% respectively,and 114 and 15 peaks have been obtained respectively.Forty-seven compounds have been identified from the essential oil of fresh leaf,and the main compounds are camphor,2-hexenoic acid,heptacosane,dibutylphthalate,diethyladipate,2,6,10-trimethyl tetradecaneanddiisobutyladipatewith relativecontents of 10.416%,8.078%,7.627%,7.463%,5.171%,4.411% and 4.144%,respectively.Fourteen compounds have been identified from the essential oil of defoliation,and the main compounds are camphor,2-carboxymethyl-3-n-hexylmaleic acid anhydride and eucalyptol with relative contents of 33.070%,12.670% and 8.620%,respectively.The relative content of camphor in essential oil from fresh leaf and defoliation is the highest.展开更多
研究了长江中游北岸武汉市汉口境内深埋地下45—47m,1990年新出土的两种古木。经鉴定:一种为针叶树材的水杉(Metasequoia glyptostroboides Hu et Cheng);另一种系阔叶树材的重阳木(Bischofia polycarpa Airy-Shaw)。地质年代属第四纪...研究了长江中游北岸武汉市汉口境内深埋地下45—47m,1990年新出土的两种古木。经鉴定:一种为针叶树材的水杉(Metasequoia glyptostroboides Hu et Cheng);另一种系阔叶树材的重阳木(Bischofia polycarpa Airy-Shaw)。地质年代属第四纪晚更新世,距今11280±190年。展开更多
文摘With annual Bischofia javanica seedlings as experimental material, the plasticity and comprehensive evaluation methods were employed to investigate the effects of different shading degrees （100% NS （natural sunshine）, 41.3% NS, 14.6% NS and 3.6% NS） on B. javanica seedlings growth, so as to obtain the shade toler- ance in B. javanica. The results showed that with the shading degree increasing, the seedling height increment, diameter increment, leaf area, fresh weights （above- ground part, underground part and whole plant） and dry weights （aboveground part, underground part and whole plant） of B. javanica seedlings all increased first and then decreased, and reached peak values under 41.3% NS, while the total root length, average root diameter, total surface area, total root volume and total root number all presented a decreasing trend. Also the comprehensive evaluation by subordinate function value method and plasticity analysis were carried out on these growth indexes. It was concluded that B. javanica seedlings have medium shade tol- erance from the comDrehensive analysis of growth indexes.
文摘The essential oil was extracted from fresh leaf and defoliation of Bischofia polycarpa(Lévl.) Airy Shaw using steam distillation,and the chemical components and relative content of essential oil were analyzed by GC-MS and peak area normalization.The results show that the yields of crude extracts of essential oil from fresh leaf and defoliation are 0.114% and 0.105% respectively,and 114 and 15 peaks have been obtained respectively.Forty-seven compounds have been identified from the essential oil of fresh leaf,and the main compounds are camphor,2-hexenoic acid,heptacosane,dibutylphthalate,diethyladipate,2,6,10-trimethyl tetradecaneanddiisobutyladipatewith relativecontents of 10.416%,8.078%,7.627%,7.463%,5.171%,4.411% and 4.144%,respectively.Fourteen compounds have been identified from the essential oil of defoliation,and the main compounds are camphor,2-carboxymethyl-3-n-hexylmaleic acid anhydride and eucalyptol with relative contents of 33.070%,12.670% and 8.620%,respectively.The relative content of camphor in essential oil from fresh leaf and defoliation is the highest.
文摘研究了长江中游北岸武汉市汉口境内深埋地下45—47m,1990年新出土的两种古木。经鉴定:一种为针叶树材的水杉(Metasequoia glyptostroboides Hu et Cheng);另一种系阔叶树材的重阳木(Bischofia polycarpa Airy-Shaw)。地质年代属第四纪晚更新世,距今11280±190年。
