The Purple Swamphen(Porphyrio porphyrio)is a rare species with an extremely small range in China.From March to June in 2005 and 2006,we investigated the nest-site selection of the Purple Swamphen in the Guangdong Haif...The Purple Swamphen(Porphyrio porphyrio)is a rare species with an extremely small range in China.From March to June in 2005 and 2006,we investigated the nest-site selection of the Purple Swamphen in the Guangdong Haifeng Avian Natural Reserve,China.Nests were bowlshaped or shallow cups with most of them constructed in hydrophyte clusters of Scirpus tabernaemontani.Distance to road and distance to water edge were significantly different between nest sites and non-nest sites and were important for determining nesting sites based on stepwise discriminant analysis.Our results suggest restoring and protecting the extant nesting areas is essential for effective conservation of the Purple Swamphen in China.展开更多
The Shaowu-Nanping-Pingtan deep seismic sounding profile is located in northern Fujian Province. High-quality seismic sounding data were acquired by five large explosive blasts received by 133 digital seismic instrume...The Shaowu-Nanping-Pingtan deep seismic sounding profile is located in northern Fujian Province. High-quality seismic sounding data were acquired by five large explosive blasts received by 133 digital seismic instruments along the profile. Based on seismic facies analysis and travel-time picking on shot record sections, a model of the velocity structure of upper crust was developed by finite-difference tomography of the first breaks; the 2-D P-wave velocity structure and tectonic characteristics of the crust were interpreted further by fitting of waveforms and seismic travel times. The results show that the top of the crystal- line basement is buried at depths of 2.0-4.0 kin, with the deepest buried up to 4.0 km within the Fuzhou Basin. The Moho in- terface was found to be deeper in the west and shallower in the east （i.e., 30.0 km near the coast, increasing to 33.0 km north- westward）. The lower crust on the east side of the Zhenghe-Haifeng Fault Zone has a smoothly varying gradient structure, whereas on the west side it has two distinct layers with a boundary between those layers at a depth of 23 km. Seismic velocities on the west side are generally lower than on the east side; a low velocity layer is observed with a lowest speed of 6.25 km/s at a depth of 22 km on the west side, which may consist of partially molten material. The Zhenghe-Haifeng Fault is a deep crustal fault, and should be a channel for deep material upwelling; it has a direct relationship with multiple stages of continental tectonic movements in Southern China and with multiple magmatic events that started in the Proterozoic and ended in the of late Tertiary in Fujian.展开更多
基金supported by the National Natural Science Foundation of China(30770311)the Field Front Project of the Knowledge Innovation Program of the Chinese Academy of Sciences(2010)the Field Station Foundation of the Guangdong Academy of Sciences(2005,2006,2008,2009)
文摘The Purple Swamphen(Porphyrio porphyrio)is a rare species with an extremely small range in China.From March to June in 2005 and 2006,we investigated the nest-site selection of the Purple Swamphen in the Guangdong Haifeng Avian Natural Reserve,China.Nests were bowlshaped or shallow cups with most of them constructed in hydrophyte clusters of Scirpus tabernaemontani.Distance to road and distance to water edge were significantly different between nest sites and non-nest sites and were important for determining nesting sites based on stepwise discriminant analysis.Our results suggest restoring and protecting the extant nesting areas is essential for effective conservation of the Purple Swamphen in China.
基金supported by the National Natural Science Foundation of China(Grant No.41474071)the Special Research of Earthquake Industry(Grant No.2015419015)the Earthquake Technology Project of Spark Plan(Grant No.XH1015)
文摘The Shaowu-Nanping-Pingtan deep seismic sounding profile is located in northern Fujian Province. High-quality seismic sounding data were acquired by five large explosive blasts received by 133 digital seismic instruments along the profile. Based on seismic facies analysis and travel-time picking on shot record sections, a model of the velocity structure of upper crust was developed by finite-difference tomography of the first breaks; the 2-D P-wave velocity structure and tectonic characteristics of the crust were interpreted further by fitting of waveforms and seismic travel times. The results show that the top of the crystal- line basement is buried at depths of 2.0-4.0 kin, with the deepest buried up to 4.0 km within the Fuzhou Basin. The Moho in- terface was found to be deeper in the west and shallower in the east （i.e., 30.0 km near the coast, increasing to 33.0 km north- westward）. The lower crust on the east side of the Zhenghe-Haifeng Fault Zone has a smoothly varying gradient structure, whereas on the west side it has two distinct layers with a boundary between those layers at a depth of 23 km. Seismic velocities on the west side are generally lower than on the east side; a low velocity layer is observed with a lowest speed of 6.25 km/s at a depth of 22 km on the west side, which may consist of partially molten material. The Zhenghe-Haifeng Fault is a deep crustal fault, and should be a channel for deep material upwelling; it has a direct relationship with multiple stages of continental tectonic movements in Southern China and with multiple magmatic events that started in the Proterozoic and ended in the of late Tertiary in Fujian.
