区域旅游生态效率实证分析——以海南省为例

基于旅游碳足迹、生态效率、旅游经济效应等理论,构建了旅游生态效率模型,在定量计算海南省2012年旅游生态效率值的基础上,对旅游生态效率区域差异进行了成因机制分析。主要结论有：① 海南省2012年旅游交通生态效率为0.898元/kg,旅游住宿生态效率为7.13元/kg,旅游活动生态效率为16.32元/kg,旅游综合生态效率为1.787元/kg,旅游活动和旅游住宿的生态效率值大于旅游交通生态效率值。② 在出行距离既定的情况下,优化旅游生态效率的措施在于：提高人均消费水平、延长平均停留时间、增加平均参与活动频次,即“短距离、长停留、高消费”的市场模式有利于优化旅游生态效率,反之,“长距离、短停留、低消费”的市场模式则拉低了旅游生态效率值。③ 海南省旅游者外部交通平均距离较大、乘坐飞机旅游者比例较高、旅游收入统计值低于实际值等原因叠加起来使其旅游生态效率水平略次于部分旅游地。     

High stress late Maastrichtian – early Danian palaeoenvironment in the Neuquén Basin, Argentina

During the late Maastrichtian to early Danian the Neuquén Basin of Argentina was adjacent to an active volcanic arc to the west and an extensive land area to the northeast. Mineralogical and geochemical studies of the Bajada del Jagüel in the Neuquén Basin indicate a generally warm climate with seasonal changes in humidity and an open seaway to the South Atlantic that maintained marine conditions. Biostratigraphic and quantitative foraminiferal and nannofossil analyses indicate that sediment deposition during the late Maastrichtian (zones CF4-CF2, N. frequens) occurred in relatively shallow middle neritic (100 m) depths with largely dysaerobic bottom waters (abundant low O₂ tolerant benthics) and fluctuating sea level. Calcareous nannofossils indicate a high stress marine environment dominated by Micula decussata. Planktic foraminifera mimic the post-K/T high stress environment with alternating blooms of the disaster opportunists Guembelitria and low oxygen tolerant Heterohelix groups, indicating nutrient-rich surface waters and an oxygen depleted water column. The high stress conditions were probably driven by high nutrient influx due to upwelling and terrestrial and volcanic influx. The K/T boundary is marked by an erosional surface that marks a hiatus at the base of a 15-25 cm thick volcaniclastic sandstone, which contains diverse planktic foraminiferal zone P1c assemblages and nannofossils of zone NP1b immediately above it. This indicates deposition of the sandstone occurred 500 ky after the K/T hiatus. No evidence of the Chicxulub impact or related tsunami deposition was detected.     

Solar Stokes Spectrum Observation at Yunnan Astronomical Observatory

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A spatially resolved 'inside-out' outburst of IP Pegasi

We present a comprehensive photometric data set taken over the entire outburst of the eclipsing dwarf nova IP Peg in 1997 September/October. Analysis of the light curves taken over the long rise to the peak-of-outburst shows conclusively that the outburst started near the centre of the disc and moved outwards. This is the first data set that spatially resolves such an outburst. The data set is consistent with the idea that long rise times are indicative of such 'inside-out' outbursts. We show how the thickness and the radius of the disc, along with the mass transfer rate, change over the whole outburst. In addition, we show evidence of the secondary and the irradiation thereof. We discuss the possibility of spiral shocks in the disc; however, we find no conclusive evidence of their existence in this data set.     

苏浙皖边界地区苏皖运动的有关问题

苏皖运动的存在于否,对研究苏浙皖边界地区的地质发展史和正确认识长兴阶地层有重要意义。笔者论证了长兴组的厚度变化、界线粘土层的性质与成因、底砾岩的确认和地层接触关系、古生物群的突变等问题,认为:1)区内苏皖运动是存在的;2)砺山-江阴海堤不可否定;将安徽广德牛头山经江苏宜兴至江阴条带内的龙潭组上部地层作为长兴组的相变产物是不妥的。      

信息科学与矿产预测

矿产预测实质上就是对成矿系统演化过程精确性表达的探索,现代信息科学的发展为理解成矿系统的非线性特性以及信息运动过程提供了必要的理论基础。通过信息与成矿信息、虚拟现实技术与成矿预测可视化和信息模型与成矿系统三个方面探讨信息科学的发展与矿产预测之间的紧密联系,预测未来成矿预测将向定量化、精细化的方向发展,对矿的定位预测从以分析为主向分析与综合相结合方向发展。     

陕北土地沙漠化及其防治区划

本文对陕北榆林地区土地沙漠化划分了四种类型及描述了沙漠化土地分布的特点,并对这一地区的沙漠化土地进行了防治区划,为全区制定综合农业区划提供科学依据。沙漠化是土地在自然和人为因素作用下,植被和土壤逐渐衰退破坏导致沙地出现的过程。当今,沙漠化迅速发展和扩大的特征是以人口的迅猛增长及滥用土地为主要标志,它所带来的对人类生活及环境的威胁,正越来越引起人们的重视。陕北地区是我国沙漠化严重地区之一,研究其发生发展的历史和现状,预测其发展趋势,从而制定沙漠化土地的治理区划,对本区沙漠化土地整治和预防具有重要意义。     

沙子口湾海岸侵蚀原因及防治对策研究

通过实测水文资料、岸滩冲淤变化规律和泥沙动态研究沙子口湾近３０ａ来的变化,分析湾顶海滩侵蚀的原因,对现有的海岸工程进行调查,研究海岸防护对策,分析海岸防护工程的可行性。