报道了浙江省乌岩岭国家级自然保护区12种凤尾藓属(Fissidens)植物,其中内卷凤尾藓济州岛变种(F.involutus Wilson ex Mitt.var.jejuensis Y.-J.Yoon,B.C.Tan&B.-Y.Sun)为中国首次报道,该变种此前只分布在日本和韩国,其特征是背翅...报道了浙江省乌岩岭国家级自然保护区12种凤尾藓属(Fissidens)植物,其中内卷凤尾藓济州岛变种(F.involutus Wilson ex Mitt.var.jejuensis Y.-J.Yoon,B.C.Tan&B.-Y.Sun)为中国首次报道,该变种此前只分布在日本和韩国,其特征是背翅基部明显下延,鞘部细胞的每个角都有1个不明显的疣。异形凤尾藓(F.anomalus)和锐齿凤尾藓(F.serratus)为浙江省新记录。在该保护区,凤尾藓属植物物种多样性随海拔升高呈单峰分布。与我国东南部地区其它保护区相比,乌岩岭的凤尾藓多样性仅次于广西的雅长自然保护区。而且,这一地区凤尾藓的多样性并没有表现出随着纬度的降低而增加的趋势。因此,建议进一步加强对我国东南部地区凤尾藓的调查和研究。展开更多
Detailed rock magnetic studies of 55 lavas from Yixian and Fuxin area, West Liaoning, show the primary carriers of remanence to be pseudo-single domain ti-tanomagnetite. K/Ar dating indicates that the volcanic sequenc...Detailed rock magnetic studies of 55 lavas from Yixian and Fuxin area, West Liaoning, show the primary carriers of remanence to be pseudo-single domain ti-tanomagnetite. K/Ar dating indicates that the volcanic sequence spans 93 to 133 Ma. Stepwise thermal demagnetization successfully isolated well-defined characteristic magnetization (ChRM) in all lavas thermal-treated above 250℃ The mean paleodirections are D/I=5.9°/58.8° (α95 = 2.9°) and D/I =179.2°/-59.9° (α95 = 5.2°) for 27 normally magnetized flows and 28 reversibly magnetized flows, respectively. It indicates that since the Early Cretaceous there is no significant horizontal movement and rotation between the Yixian-Fuxin area and Eurasia. However, Korea Peninsula may have undergone a clockwise rotation of 33.9° relative to the Yixian-Fuxin area during the Cretaceous. On the basis of characteristics of hotspot origins (core-mantle boundary or upper mantle), the clockwise rotation of Korea Peninsula relative to Eurasia is assumed to be展开更多
基金supported by the National Natural Science Foundation of China(Grant No.32070228,31770371)the Project for Natural Science in Guangxi(Grant No.2020GXNSFAA297085)the Program of the Ministry of Ecology and Environment of China(2019—2023)。
文摘报道了浙江省乌岩岭国家级自然保护区12种凤尾藓属(Fissidens)植物,其中内卷凤尾藓济州岛变种(F.involutus Wilson ex Mitt.var.jejuensis Y.-J.Yoon,B.C.Tan&B.-Y.Sun)为中国首次报道,该变种此前只分布在日本和韩国,其特征是背翅基部明显下延,鞘部细胞的每个角都有1个不明显的疣。异形凤尾藓(F.anomalus)和锐齿凤尾藓(F.serratus)为浙江省新记录。在该保护区,凤尾藓属植物物种多样性随海拔升高呈单峰分布。与我国东南部地区其它保护区相比,乌岩岭的凤尾藓多样性仅次于广西的雅长自然保护区。而且,这一地区凤尾藓的多样性并没有表现出随着纬度的降低而增加的趋势。因此,建议进一步加强对我国东南部地区凤尾藓的调查和研究。
文摘Detailed rock magnetic studies of 55 lavas from Yixian and Fuxin area, West Liaoning, show the primary carriers of remanence to be pseudo-single domain ti-tanomagnetite. K/Ar dating indicates that the volcanic sequence spans 93 to 133 Ma. Stepwise thermal demagnetization successfully isolated well-defined characteristic magnetization (ChRM) in all lavas thermal-treated above 250℃ The mean paleodirections are D/I=5.9°/58.8° (α95 = 2.9°) and D/I =179.2°/-59.9° (α95 = 5.2°) for 27 normally magnetized flows and 28 reversibly magnetized flows, respectively. It indicates that since the Early Cretaceous there is no significant horizontal movement and rotation between the Yixian-Fuxin area and Eurasia. However, Korea Peninsula may have undergone a clockwise rotation of 33.9° relative to the Yixian-Fuxin area during the Cretaceous. On the basis of characteristics of hotspot origins (core-mantle boundary or upper mantle), the clockwise rotation of Korea Peninsula relative to Eurasia is assumed to be
