A new mamenchisaurid dinosaur, Eomamenchisaurus yuanmouensis gen et sp. nov. is erected based on an incomplete skeleton from the Zhanghe Formation, the Middle Jurassic of Yuanmou, Yunnan Province. The new taxon is cha...A new mamenchisaurid dinosaur, Eomamenchisaurus yuanmouensis gen et sp. nov. is erected based on an incomplete skeleton from the Zhanghe Formation, the Middle Jurassic of Yuanmou, Yunnan Province. The new taxon is characterized by absence of pleurocoels in dorsal vertebrae and the dorsal verterbrae with slightly convex anterior articular surfaces, moderately concave posterior articular surfaces; the fourth trochanter is developed posteromedially on the femur; length ratio of the tibia to the femur is approximately 0.64; and the shaft of the ischium is rod-like. Two fused centra of the posterior dorsal vertebrae （the presumed 9th and the 10th dorsal vertebrae） are similar to those in other mamenchisaurid dinosaurs, including Mamenchisaurus hochuanesis, M. youngi and Chuanjiesaurus anaensis. Therefore, fusion of centra of the ninth and the tenth dorsal vertebrae can be recognized as a synapomorphic character of the Mamenchisauridae.展开更多
Yuanmousaurusjiangyiensis gen. et sp. nov. is erected based on an incomplete skeleton. It is characterized by more complex structures of the neural arches in the dorsal vertebrae than those in Omeisaurus, but less com...Yuanmousaurusjiangyiensis gen. et sp. nov. is erected based on an incomplete skeleton. It is characterized by more complex structures of the neural arches in the dorsal vertebrae than those in Omeisaurus, but less complex than those of Euhelopus; the dorsal vertebra bears 9 laminae, forming three cavities on the lateral surface of the neural arch; the dorsal vertebral neural spines with dorsoventrally-oriented cavities are similar to those of Omeisaurus and Patagosaurus. Yuanmousaurus is more primitive than Euhelopus, but more derived than Omeisaurus. The similar dorsal vertebral structure between Yuanmousaurus and Patagosaurus may indicate that they have a close relationship to each other.展开更多
在昆明西山国家森林公园地盘松林连续分布区内设置样地,并将样地内的地表凋落物分成枯枝、凋落物上层和凋落物下层3层,通过外业调查采集样品,在实验室测定载量、热值等相关燃烧能量参数,以单位面积热量为关键指标研究地盘松林地表凋落...在昆明西山国家森林公园地盘松林连续分布区内设置样地,并将样地内的地表凋落物分成枯枝、凋落物上层和凋落物下层3层,通过外业调查采集样品,在实验室测定载量、热值等相关燃烧能量参数,以单位面积热量为关键指标研究地盘松林地表凋落物的潜在能量。结果表明,在地盘松林地表凋落物中,凋落物上层、下层和枯枝的单位面积热量最大值差异不大,分别为51 866.3 k J/m2、48 942.13 k J/m2和42 611.53 k J/m2;平均值的差异也不大,分别为38 688.5 k J/m2、39 716.63 k J/m2和25 796.23 k J/m2。但最低值的差异却非常明显,凋落物上层的为25 510.8 k J/m2,枯枝的为8 980.93 k J/m2,凋落物下层的为30 491.1 k J/m2。展开更多
文摘A new mamenchisaurid dinosaur, Eomamenchisaurus yuanmouensis gen et sp. nov. is erected based on an incomplete skeleton from the Zhanghe Formation, the Middle Jurassic of Yuanmou, Yunnan Province. The new taxon is characterized by absence of pleurocoels in dorsal vertebrae and the dorsal verterbrae with slightly convex anterior articular surfaces, moderately concave posterior articular surfaces; the fourth trochanter is developed posteromedially on the femur; length ratio of the tibia to the femur is approximately 0.64; and the shaft of the ischium is rod-like. Two fused centra of the posterior dorsal vertebrae （the presumed 9th and the 10th dorsal vertebrae） are similar to those in other mamenchisaurid dinosaurs, including Mamenchisaurus hochuanesis, M. youngi and Chuanjiesaurus anaensis. Therefore, fusion of centra of the ninth and the tenth dorsal vertebrae can be recognized as a synapomorphic character of the Mamenchisauridae.
文摘Yuanmousaurusjiangyiensis gen. et sp. nov. is erected based on an incomplete skeleton. It is characterized by more complex structures of the neural arches in the dorsal vertebrae than those in Omeisaurus, but less complex than those of Euhelopus; the dorsal vertebra bears 9 laminae, forming three cavities on the lateral surface of the neural arch; the dorsal vertebral neural spines with dorsoventrally-oriented cavities are similar to those of Omeisaurus and Patagosaurus. Yuanmousaurus is more primitive than Euhelopus, but more derived than Omeisaurus. The similar dorsal vertebral structure between Yuanmousaurus and Patagosaurus may indicate that they have a close relationship to each other.
文摘在昆明西山国家森林公园地盘松林连续分布区内设置样地,并将样地内的地表凋落物分成枯枝、凋落物上层和凋落物下层3层,通过外业调查采集样品,在实验室测定载量、热值等相关燃烧能量参数,以单位面积热量为关键指标研究地盘松林地表凋落物的潜在能量。结果表明,在地盘松林地表凋落物中,凋落物上层、下层和枯枝的单位面积热量最大值差异不大,分别为51 866.3 k J/m2、48 942.13 k J/m2和42 611.53 k J/m2;平均值的差异也不大,分别为38 688.5 k J/m2、39 716.63 k J/m2和25 796.23 k J/m2。但最低值的差异却非常明显,凋落物上层的为25 510.8 k J/m2,枯枝的为8 980.93 k J/m2,凋落物下层的为30 491.1 k J/m2。
