Here we report a left cheek plate of Psarolepis,a postparietal shield of Youngolepis,a skull of Diabolepis,and a scale of Styloichthys from the Lianhuashan and Nahkaoling formations(Lochkovian,Lower Devonian)of Nannin...Here we report a left cheek plate of Psarolepis,a postparietal shield of Youngolepis,a skull of Diabolepis,and a scale of Styloichthys from the Lianhuashan and Nahkaoling formations(Lochkovian,Lower Devonian)of Nanning,Guangxi.This marks the first report of Diabolepis and Styloichthys beside Qujing,Yunnan,and the latest occurrence of Psarolepis to date.The fossil community displays significant similarities to the Xujiachong Assemblage,and provides new data for the Lower Devonian stratigraphic correlation between southwestern China and northern Vietnam.Given the latest dating constraint based on the conodont evidence,we regard that the Xujiachong Assemblage has a much longer range than previously supposed,extending from the latest Lochkovian to the end of Pragian.We propose that the transition of the Nahkaoling and Lianhuashan formations in Nanning might correspond to the Guijiatun Formation in Qujing.The relatively large size of fish individuals from Guangxi is probably attributed to the increase in the oxygen content of the ocean.展开更多
Mingalarpar!On behalf of the Consulate-General of the Republic of the Union of Myanmar in Nanning,I would like to express my sincerest congratulations to CAEXPO on reaching the remarkable milestone of over 20 years—a...Mingalarpar!On behalf of the Consulate-General of the Republic of the Union of Myanmar in Nanning,I would like to express my sincerest congratulations to CAEXPO on reaching the remarkable milestone of over 20 years—an incredible journey filled with numerous achievements.展开更多
Since 2004,China has been dedicated to expanding economic integration with ASEAN countries,designating Guangxi Zhuang Autonomous Region as a hub to attract ASEAN member countries for greater coordination and economic ...Since 2004,China has been dedicated to expanding economic integration with ASEAN countries,designating Guangxi Zhuang Autonomous Region as a hub to attract ASEAN member countries for greater coordination and economic cooperation.Each year,Guangxi hosts the China-ASEAN Expo(CAEXPO)and related activities,providing a platform for strategic economic partners to meet,discuss,and explore ways to strengthen trade and investment cooperation.展开更多
[ Objective ] With Cupressustorulosa, Cinnamomum camphora and Cyclobalanopsis Oerst as test materials, the paper studied the effects of different non- host plants on olfactory responses of Tomicus yunnanensis. [ Metho...[ Objective ] With Cupressustorulosa, Cinnamomum camphora and Cyclobalanopsis Oerst as test materials, the paper studied the effects of different non- host plants on olfactory responses of Tomicus yunnanensis. [ Method ] The needles of Pinus yunnanensis were mixed with the leaves of Cupressustondosa, C. cam- phora and C. Oerst according to the ratios of 0 g ： 6 g, 1 g ： 5 g, 2 g ： 4 g, 3 g ： 3 g, 4 g ： 2 g, 5 g ： 1 g and 6 g ： 0 g, and the mixtures were put in the re- spanse arm of Y-tube olfactometer as odor source to observe the olfactory behavior of T. yunnanensis, the empty arm was set as control. [ Result ] When the needles of P. yunnanensis were mixed with the leaves of non-hest plants according to the ratio of 1 g ： 5 g and 2 g ： 4 g, they had less difference on attractive rate to T. yun- nanensis compared with complete P. yunnanensis needles in mixture （ratio： 6 g ： 0 g）, and the maximum difference was 14%. When the needles ofP. yunnanen- sis were mixed with non-host leaves according to the ratio of 1 g ： 5 g, 2 g ： 4 g, the attractive rate to T. yunnanensis decreased compared with complete P. yun- nanensis needles in mixture （ ratio： 6 g ： 0 g）, and the decrease value in maximum was 40%. [ Conclusion] When the ratio of non-host plants was relatively small in mixed leaves, non-host had less impact on olfactory responses of T. yunnanensis. As the proportion of non-hest leaves gradually increased, the attractive rate of leaf mixtures to T. yunnanensis was gradually small. The results could provide reference for determination of mixed ratio in construction of mixed forest and the de- velopment of botanical attractive and repellent of T. yunnanensis.展开更多
By using GIS, RS and landscape ecology, LandsatTM (1993 and 2009) and ETM (2001) remote sensing images of Licheng District of Ji’nan City, Shandong Province were interpreted, and dynamic changes of landscape pattern ...By using GIS, RS and landscape ecology, LandsatTM (1993 and 2009) and ETM (2001) remote sensing images of Licheng District of Ji’nan City, Shandong Province were interpreted, and dynamic changes of landscape pattern in the district were analyzed at the levels of class and landscape. The results showed that during the 16 years the landscape pattern in the district had changed significantly. (a) From the perspective of patch category, areas of arable land, woodland and grassland decreased unceasingly, and arable land accounted for the largest reduction from 488.15 km 2 in 1993 down to 324.37 km 2 in 2009, witnessing a reduction rate of 33.56%. But the patch quantity and fragmentation increased, patch connectivity reduced. Spatial pattern of construction land expanded and its area witnessed a significant increase of 147.05%. Patch cohesion index increased and connectivity grew better. (b) From the perspective of overall landscape, patch quantity, contagion and perimeter-area fractal dimension decreased, patch shape became simple, the Shannon’s diversity index, Shannon’s evenness index and splitting index increased, landscape heterogeneity rose. With the rapid social and economic development, landscape pattern will be more and more influenced by human behaviors展开更多
文摘Here we report a left cheek plate of Psarolepis,a postparietal shield of Youngolepis,a skull of Diabolepis,and a scale of Styloichthys from the Lianhuashan and Nahkaoling formations(Lochkovian,Lower Devonian)of Nanning,Guangxi.This marks the first report of Diabolepis and Styloichthys beside Qujing,Yunnan,and the latest occurrence of Psarolepis to date.The fossil community displays significant similarities to the Xujiachong Assemblage,and provides new data for the Lower Devonian stratigraphic correlation between southwestern China and northern Vietnam.Given the latest dating constraint based on the conodont evidence,we regard that the Xujiachong Assemblage has a much longer range than previously supposed,extending from the latest Lochkovian to the end of Pragian.We propose that the transition of the Nahkaoling and Lianhuashan formations in Nanning might correspond to the Guijiatun Formation in Qujing.The relatively large size of fish individuals from Guangxi is probably attributed to the increase in the oxygen content of the ocean.
文摘Mingalarpar!On behalf of the Consulate-General of the Republic of the Union of Myanmar in Nanning,I would like to express my sincerest congratulations to CAEXPO on reaching the remarkable milestone of over 20 years—an incredible journey filled with numerous achievements.
文摘Since 2004,China has been dedicated to expanding economic integration with ASEAN countries,designating Guangxi Zhuang Autonomous Region as a hub to attract ASEAN member countries for greater coordination and economic cooperation.Each year,Guangxi hosts the China-ASEAN Expo(CAEXPO)and related activities,providing a platform for strategic economic partners to meet,discuss,and explore ways to strengthen trade and investment cooperation.
基金Supported by 948 Project of State Forestry Administration(2009-4-38)~~
文摘[ Objective ] With Cupressustorulosa, Cinnamomum camphora and Cyclobalanopsis Oerst as test materials, the paper studied the effects of different non- host plants on olfactory responses of Tomicus yunnanensis. [ Method ] The needles of Pinus yunnanensis were mixed with the leaves of Cupressustondosa, C. cam- phora and C. Oerst according to the ratios of 0 g ： 6 g, 1 g ： 5 g, 2 g ： 4 g, 3 g ： 3 g, 4 g ： 2 g, 5 g ： 1 g and 6 g ： 0 g, and the mixtures were put in the re- spanse arm of Y-tube olfactometer as odor source to observe the olfactory behavior of T. yunnanensis, the empty arm was set as control. [ Result ] When the needles of P. yunnanensis were mixed with the leaves of non-hest plants according to the ratio of 1 g ： 5 g and 2 g ： 4 g, they had less difference on attractive rate to T. yun- nanensis compared with complete P. yunnanensis needles in mixture （ratio： 6 g ： 0 g）, and the maximum difference was 14%. When the needles ofP. yunnanen- sis were mixed with non-host leaves according to the ratio of 1 g ： 5 g, 2 g ： 4 g, the attractive rate to T. yunnanensis decreased compared with complete P. yun- nanensis needles in mixture （ ratio： 6 g ： 0 g）, and the decrease value in maximum was 40%. [ Conclusion] When the ratio of non-host plants was relatively small in mixed leaves, non-host had less impact on olfactory responses of T. yunnanensis. As the proportion of non-hest leaves gradually increased, the attractive rate of leaf mixtures to T. yunnanensis was gradually small. The results could provide reference for determination of mixed ratio in construction of mixed forest and the de- velopment of botanical attractive and repellent of T. yunnanensis.
文摘By using GIS, RS and landscape ecology, LandsatTM (1993 and 2009) and ETM (2001) remote sensing images of Licheng District of Ji’nan City, Shandong Province were interpreted, and dynamic changes of landscape pattern in the district were analyzed at the levels of class and landscape. The results showed that during the 16 years the landscape pattern in the district had changed significantly. (a) From the perspective of patch category, areas of arable land, woodland and grassland decreased unceasingly, and arable land accounted for the largest reduction from 488.15 km 2 in 1993 down to 324.37 km 2 in 2009, witnessing a reduction rate of 33.56%. But the patch quantity and fragmentation increased, patch connectivity reduced. Spatial pattern of construction land expanded and its area witnessed a significant increase of 147.05%. Patch cohesion index increased and connectivity grew better. (b) From the perspective of overall landscape, patch quantity, contagion and perimeter-area fractal dimension decreased, patch shape became simple, the Shannon’s diversity index, Shannon’s evenness index and splitting index increased, landscape heterogeneity rose. With the rapid social and economic development, landscape pattern will be more and more influenced by human behaviors
