贺兰山西麓中生代构造反转及意义

通过对小松山断裂特征的再分析和对顺层断层特征的观察研究发现,发育于贺兰山北段西麓的小松山“推覆”构造实际上是一个滑覆构造。该区于晚侏罗世之后发生大规模构造反转,贺兰山沉积特征及玄武岩环境指示该区是一大陆裂谷斜坡,在中生代早中期并不存在大规模的东西向挤压应力环境。滑覆面之下的三叠系—中上侏罗统的褶皱变形及顺层剪切是这种滑覆引起的局部构造变形,与鄂尔多斯地块西部发育的典型的东西向逆冲形成明显对比,值得重视。      

同一问题的四次解答——南京邮电大学仙林校区图书馆的设计探索与反思

南京邮电大学仙林校区图书馆是新建校园中心区的标志性建筑,但建筑功能所需要的体量与其所处的特殊环境产生矛盾。面对这一问题,我们根据设计条件的变化提出了四种不同的解决问题的思路。     

关于雪峰山一带金成矿区的成矿时代

雪峰金成矿区的矿床(点)均赋存在前寒武纪地层中,但武陵-雪峰期成矿作用并不重要,火山沉积-变质热液成矿模式并不能很好地解释本区金矿床的形成.根据铅同位素资料分析和矿床构造地质研究,认为本区金的成矿时代与华南地区铀的成矿时代一样,主要为中新生代,金矿化可能主要与中新生代地壳拉张伸展作用所致的热水改造富集作用有关.     

Immunological Memory of Mountain Birches: Effects of Phenolics on Performance of the Autumnal Moth Depend on Herbivory History of Trees

Plants have been suggested to have an immunological memory comparable to animals. The evidence for this, however, is scarce. In our study with the mountain birch—Epirrita autumnata system, we demonstrated that birches exposed as long as 5 yr to feeding of E. autumnata larvae (delayed induced resistance, DIR), responded more strongly to a new challenge than trees without an herbivory history. Pupal weights remained lower, and the duration of the larval period was prolonged in the DIR trees, although immunity, measured as an encapsulation rate, was not affected. We further demonstrated that the effects of birch phenolics on performance of E. autumnata were different in the exposed (DIR) trees from naive control trees, although we found only one significant change in chemistry. The quercetin:kaemferol ratio was increased in DIR trees, suggesting that herbivory caused oxidative stress in birches. In DIR trees, phenolics, especially hydrolyzable tannins (HTs), affected pupal weights negatively, whereas in control trees, the effects were either nonsignificant or positive. HTs also prolonged the duration of the larval period of females, whereas peroxidase (POD) activity prolonged that of males. We suggest that the causal explanation for the induced resistance was an enhanced oxidation of phenolic compounds from the DIR trees in the larval digestive tract. Phenolic oxidation produces semiquinones, quinones, free radicals, and ROS, which may have toxic, antinutritive, and/or repellent properties against herbivores.     

Proceedings of the Thirty-Third Annual Meeting of the Rocky Mountain Psychological Association.

The program included the Presidential Address, 2 invited addresses, 6 symposia, and 34 papers, the titles and authors of which are listed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Assessment of QuickBird high spatial resolution imagery to detect red attack damage due to mountain pine beetle infestation

High spatial resolution remotely sensed data has the potential to complement existing forest health programs for both strategic planning over large areas, as well as for detailed and precise identification of tree crowns subject to stress and infestation. The area impacted by the current mountain pine beetle (Dendroctonus ponderosae Hopkins) outbreak in British Columbia, Canada, has increased 40-fold over the previous 5 years, with approximately 8.5 million ha of forest infested in 2005. As a result of the spatial extent and intensity of the outbreak, new technologies are being assessed to help detect, map, and monitor the damage caused by the beetle, and to inform mitigation of future beetle outbreaks. In this paper, we evaluate the capacity of high spatial resolution QuickBird multi-spectral imagery to detect mountain pine beetle red attack damage. ANOVA testing of individual spectral bands, as well as the Normalized Difference Vegetation Index (NDVI) and a ratio of red to green reflectance (Red-Green Index or RGI), indicated that the RGI was the most successful (p < 0.001) at separating non-attack crowns from red attack crowns. Based on this result, the RGI was subsequently used to develop a binary classification of red attack and non-attack pixels. The total number of QuickBird pixels classified as having red attack damage within a 50 m buffer of a known forest health survey point were compared to the number of red attack trees recorded at the time of the forest health survey. The relationship between the number of red attack pixels and observed red attack crowns was assessed using independent validation data and was found to be significant (r² = 0.48, p < 0.001, standard error = 2.8 crowns). A comparison of the number of QuickBird pixels classified as red attack, and a broader scale index of mountain pine beetle red attack damage (Enhanced Wetness Difference Index, calculated from a time series of Landsat imagery), was significant (r² = 0.61, p < 0.001, standard error = 1.3 crowns). These results suggest that high spatial resolution imagery, in particular QuickBird satellite imagery, has a valuable role to play in identifying tree crowns with red attack damage. This information could subsequently be used to augment existing detailed forest health surveys, calibrate synoptic estimates of red attack damage generated from overview surveys and/or coarse scale remotely sensed data, and facilitate the generation of value-added information products, such as estimates of timber volume impacts at the forest stand level.     

应用分形维数研究土壤团聚体与低吸力段持水性的关系

将土壤水动力参数和易测定的土壤物理特性联系起来一直是土壤物理学的重要研究内容,分形理论为这方面研究提供了新的途径。本文以贡嘎山亚高山林区11个土壤样品为例,研究了土壤团聚体分形维数和低吸力段持水曲线分形维数的关系。结果表明:分形维数能较好地描述土壤团聚体数量组成、土壤水分分配;干、湿团聚体分形维数(CFD、WFD)与低吸力段持水曲线分形维数(FDw)之间相关系数为0.891、0.759,呈极显著性直线正相关,线性回归方程式定量地描述了研究区森林土壤团聚体对土壤低吸力段持水性能的影响。     

六盘山过湿土填筑的处置措施

为解决过湿土填筑路基问题,分析了六盘山地区过湿土形成的原因,提出晾晒,掺加粉煤灰、水泥、固化剂和生石灰的过湿土处置方案.因限于课题组内部技术(必须满足规范的压实度要求等)和资金的问题,只进行了掺生石灰粉处置过湿土的试验段的填筑,总结出生石灰粉处置过湿土的最高含水量限制及适宜的施工工艺.     

试论武当山旅游资源之道教文化

武当山素有“天下第一仙山”之誉,武当道教更是驰名宇内,其所存宗教建筑规模宏大,古代文物精美绝伦,道学思想精深卓著,同时武当武学压盏环宇,武当道医神玄超然。然而自清末至今,武当宫观未得到大规模的修复,其神髓没有得到发掘。     

井冈山时期党员思想政治教育的特点及现实意义

井冈山时期党员思想政治教育的许多理论和实践,实际上已经是对如何保持党的先进性问题的最初思考。这一时期将树立崇高理想和坚定信念作为党员思想政治教育的首要目标,将克服各种非无产阶级思想作为党员思想政治教育的首要工作,将"党群关系"教育作为党员思想政治教育的重要内容。这些宝贵经验是中国共产党在新形势下搞好自身建设的思想宝库和理论泉源,对于进一步推进党的先进性建设,具有长期的指导作用和深远的现实意义。