云南省金沙江流域生态环境建设的问题与对策研究--长江上游生态屏障建设重点地区调查报告之一

生态环境保护和建设是我国西部大开发的重要战略之一。云南省金沙江流域是长江上游生态脆弱地区,也是生态环境保护和建设的重点地区．在实地调研的基础上分析云南省金沙江流域地区的生态环境状况,探讨该区域生态环境建设中存在的主要问题,并提出了进一步加强该地区生态环境建设的对策建议．     

Regional patterns of particulate spectral absorption in the Pearl River estuary

Knowledge about the spectral absorption properties of marine particulate matters is of important signification for various goals of optical oceanography, among them the most concerns are the bio-optical algorithms for ocean color remote sensing[1], basic theory of light radiative transfer in water column[2], bio-optical models for estima-tion of primary productivity and simulation of the upper ocean ecological process[3,4]. The spectral absorption by marine particulate matter is combined influe…     

Change in the sedimentary environment of Wanquan River Estuary,Hainan Island,China

Pb geochronology and sediment core profiles of organic carbon, total sulfur and organic carbon isotope (d 13C) values were used to reconstruct the local environ-mental history of the Shamei Lagoon, located in the Wan-quan River Estuary, eastern Hainan Island, China. Totalsulfur and d 13C values decreased upwards in the top 30 cm of a sediment core that spanned the last 200 years of deposi-tion. Total sulfur concentration and d 13C values respectively decreased upward from 1.92% to 0.36%, and -20.63?to -23.64? The C/S ratio in the 19th century and earlier was relatively stable in the range of 0.47—0.80, and there was a positive correlation between organic carbon and total sulfur. Since around 1900 AD, the C/S ratio increased rapidly to a maximum of 3.94, but no simple correlation was found be-tween organic carbon and total sulfur during this more re-cent period. These results indicated that before 1800 AD, the lagoon had a fully marine character, and the location of to-day抯 Wanquan River Estuary was an open embayment.From 1800 to 1900, the salinity of Shamei Lagoon decreased noticeably. The amount of seawater which could enter thelagoon decreased gradually as the Yudai spit grew. Today,seawater scarcely affects the lagoon; it is essentially a fresh-water basin.     

Response of the accumulation of proline in the bodies of<Emphasis Type="Italic">Populus euphratica</Emphasis> to the change of groundwater level at the lower reaches of Tarim River

The content of proline in the plant bodies is closely related to the converse-succession-resistant capability of plants. Under the drought stress, the proline accumulates rapidly in the plant bodies for maintaining a certain mois-ture content and an expanding-pressure momentum in cells through the osmoregulation, thus the drought-resis- tant capability and the converse-succession-resistant ca-pability of plants are increased[1,2]. Many researches on the relationship between the proline and the…     

基于手机定位的交通OD数据获取技术

出行OD是进行交通规划和路网管理的重要基础信息,是反映出行需求空间分布的重要参数,其准确程度将影响交通分配模型的效果。由于传统的居民出行调查、电话调查以及路边询问等调查方式存在较大局限性,因此实际中很难获取高质量的OD数据。利用已有的手机通信网络设施,借助手机定位技术对目标对象进行连续位置跟踪,通过数据处理和建模分析提取追踪对象的OD信息。本文根据对目标对象进行位置追踪所采用的技术不同分为两类：（1）通过信号强度参数结合几何原理定位得到手机的平面坐标;（2）通过通信网络所记录的手机位置变化的位置区数据。     

根溪河小流域高程和坡度对水土流失现状的影响

为了探讨福建省长汀水土流失严重的原因,选取地形因子中的高程和坡度,结合“3S”的空间分析技术,对根溪河小流域的水土流失现状进行分析.研究表明:流域内海拔为300～350m所占的面积最大,比例为34.06%,而坡度在25～35°之间的面积最大,占总面积的27.27%;海拔在300～400m之间,因人类活动频繁而又缺乏合理规划与保护措施,导致此区域内成为水土流失分布最广和最严重的地带,而坡度为15～20°的土壤侵蚀率最高.     

Discovery of a 1.0 Ma Yellow River terrace and redating of the fourth Yellow River terrace in Lanzhou area

Based on the aeolian loess sequence-stratigraphic division and paleomagnetic datings on terraces, we found that an undiscovered terrace with the age of 1.0 Ma BP lies between the Dunwashan terrace and Wuyishan terrace. This terrace recorded an intensive Yellow River incision event during that period. Results of paleomagnetic dating and optically stimulated luminescence (OSL) dating of the Wuyishan loess section and Zaoshugou loess section on the fourth Yellow River terrace (T4) show that the age of the fourth Yellow River terrace in Lanzhou area is 0.86 Ma BP rather than the previously believed 0.6 Ma BP. This result answers a long-term question in the geomorphology community of whether there exists a 0.8 Ma terrace in Lanzhou area. The discovery of the 1.0 Ma Yellow River terrace and redating of the age of 0.6 Ma terrace in Lanzhou area provide new insights into further research on the evolution of Yellow River.     

嘉陵江中游地区宗教旅游资源开发研究

嘉陵江中游地区宗教旅游资源丰富，极具开发价值，对其合理开发利用，推出宗教文化旅游，是促进该区域旅游业发展的有效选择之一。作者分析了嘉陵江中游地区宗教旅游资源的特点，指出目前开发利用中存在的问题，并提出进一步开发的对策与建议。     

体育旅游在三峡库区的实施及发展对策

三峡库区的体育旅游起步晚,开发时间短、经济基础薄弱、基础设施建设相当落后。文章提出发挥政府力量,鼓励社会投资;抓好规划开发,发展体育旅游精品;加强体育旅游人才的引进和培养;建立监督机制,加强安全保障等发展体育旅游的对策。     

天津滨海新区都市旅游可持续发展对策初探

天津滨海新区开发上升为国家级发展战略,对城市功能的国际化、服务职能的多元化以及城市环境风貌的生态化提出了更高的要求,从而使滨海新区都市旅游及其可持续发展研究成为推动其进一步开发开放的一个重要的课题。本文首先综述了国内外都市旅游研究概况,并就天津滨海新区开展都市旅游的优劣势进行分析,在此基础上提出了滨海新区都市旅游可持续发展的对策。