检索结果-南通市图书馆

Evaluation on Tourism Ecological Security in Nature Heritage Sites——Case of Kanas Nature Reserve of Xinjiang,China

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2009年第3期19卷 265-273页

作者： LIU Xuling YANG Zhaoping DI Feng chen xuegang Tourism School Xinjiang University of Finance ＆ Economics Urumqi 830012 China Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China School of Geography Science and Tourism Xinjiang Normal University Urumqi 830054 China

The nature heritages are the precious legacy of nature with outstanding scientific and aesthetic value. They are quite different from other common ecotourism areas, because of its original and unique system, sensitive and vulnerable landscape, and peripheral cultural features. Therefore, the tourism development in the nature heritage sites should be on the premise of ecological security. The evaluation index system of tourism ecological security in nature heritage sites was constructed in this article by AHP and Delphi methods, including nature ecological security, landscape visual security and local culture ecological security, and the security thresholds of indices were also established. In the indices' weights of the evaluation model, the nature ecological security ranked the highest, followed by tourist landscape visual security and culture ecological security, which reflected the influence degree of the limited factor to tourism ecological security. Then, this paper carried out an empirical study of Kanas of Xinjiang Uygur Autonomous Region, China, which has the potential to be the World Nature Heritage. On the basis of the data attained from survey and observation on the spot, as well as questionnaire answered by tourists and local communities, the ecological security status in Kanas was evaluated. The result showed that the status of Kanas tourism ecological security was better, but there had some limiting factors. Lastly, effective measures were put forward to ensure its ecological security.

关键词： nature heritage tourism ecological security nature ecological security landscape visual security local culture ecological security Kanas

Study on Simulating Spatial Distribution and Varying Patterns of Urumqi’s Population

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Population,Resources and Environment 2007年第3期5卷 31-36页

作者： chen xuegang Yang Zhaoping Zhang Xiaolei Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi Xingjing 830011 China Graduate School Chinese Academy of Sciences Beijing 100039 China

In this paper, an approach to simulate the spatial dis- tribution of urban population is proposed using urban land use and population statistical data through the geographical information systems (GIS). Then, the spatial population distribution of Urumqi as a case is simulated by the approach mentioned above and its varying patterns are analyzed by the raster population surface. As a result, producing raster population surface is more accurate and natural than the traditional choropleth map of population density. Concerning the spatial population distribution of Urumqi, the population density declines from south to north and the population distribution mainly presents "T-type", the population distribution presents multi-centre agglomeration and the population distribu- tion of the districts shows different features. The population den- sity varies significantly with the increase in the distance from central business district (CBD). Finally, it is found in this paper that the development history of districts, terrain and traffic road are main factors that have an influence Urumqi’s population dis- tribution. This paper tries to provide more accurate population data for the plan and management of urban land, traffic and public facilities in order to enrich the researches on urban population distribution.

关键词： population spatial interpolation distribution

Identifying the influence of urbanization on soil organic matter content and p H from soil magnetic characteristics

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2015年第6期7卷 820-830页

作者： YANG Han XIONG Heigang chen xuegang WANG Yaqi ZHANG Fang College of Resource and Environment Sciences Xinjiang University College of Geographical Science and Tourism Xinjiang Normal University College of Applied Arts and Science of Beijing Union University

Soil magnetic characteristics are correlated with soil p H and organic matter content. Analyzing soil magnetic characteristics, organic matter content and p H can indirectly evaluate soil pollution caused by human activities. This study analyzed the soil magnetic characteristics, organic matter content and p H in surface soil samples from different land use types in Shihezi city, a newly and rapidly developing oasis city in Xinjiang of China. The aims of this study were to explore the possible relationships among the soil magnetic parameters and thereby improve the understanding of influence of urbanization on soil properties. Eighty surface soil samples at the depth of 0–10 cm were collected from 29 July to 4 August 2013. The results showed that the magnetic minerals in surface soil were dominated by ferromagnetic minerals. Spatially, the magnetic susceptibility（χLF）, anhysteretic remanent magnetization susceptibility（χARM）, saturation isothermal remanent magnetization（SIRM） and ＂soft＂ isothermal remanent magnetization（SOFT） were found to be most dominant in the new northern urban area B（N-B）, followed by built-up areas（U）, suburban agricultural land（F）, and then the new northern urban area A（N-A）. The values of χLF, χARM, SIRM and SOFT were higher in the areas with high intensities of human activities and around the main roads. Meanwhile, the property ＂hard＂ isothermal remanent magnetization（HIRM） followed the order of U〉N-B〉F〉N-A. Built-up areas had an average p H value of 7.93, which was much higher than that in the new northern urban areas as well as in suburban agricultural land, due to the increased urban pollutant emissions. The average value of soil organic matter content in the whole study area was 34.69 g/kg, and the values in the new northern urban areas were much higher than those in the suburban agricultural land and built-up areas. For suburban agricultural land, soil organic matter content was significantly negatively correlated with χLF, and had no

关键词： environmental magnetism surface soil p H soil organic matter content

Sedimentary geochemical proxies for methane seepage at Site C14 in the Qiongdongnan Basin in the northern South China Sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2019年第7期38卷 84-95页

作者： Tiantian Sun Daidai Wu Fei Yang Lihua Liu xuegang chen Ying Ye Ocean College of Zhejiang University Zhoushan 316021China Key Laboratory of Gas Hydrate Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China Evaluation and Detection Technology Laboratory of Marine Mineral Resources Pilot National Laboratory for Marine Sciences and Technology(Qingdao)Qingdao 266071China

Recent studies have shown that specific geochemical characteristics of sediments can be used to reconstruct past methane seepage *** this work,the correlation between the Sr/Ca and Mg/Ca ratios of sediment samples is analyzed and the sulfate concentration profile in Site C14 from cold-seep sediments in the Qiongdongnan Basin in northern South China Sea is *** results confirmed that,sulfate at 0–247 cm below sea floor(Unit I)is mainly consumed by organic matter sulfate reduction(OSR),while sulfate at 247–655 cm(UnitⅡ)is consumed by both the OSR and the anaerobic oxidation of methane(AOM).In addition,the bottom sediment layer is affected by weak methane *** Mo and U enrichment factors also exhibit similar trends in their respective depth *** responses of trace elements,including Co/Al,Ni/Al,Cr/Al and Zn/Al ratios to methane seepage allowed the study of depositional conditions and methane seepage *** on the results,it is speculated that the depositional conditions of UnitⅡchanged with depth from moderate conditions of sulfidic and oxic conditions to locally anoxic conditions,and finally to suboxic conditions due to methane fluid *** stable isotope values of chromium-reducible sulfide produced by AOM and those of sulfide formed by OSR in the early diagenetic environment suffered serious depletion of *** was probably due to weak methane leakage,which caused the slower upward diffusion and the effect of early diagenesis on the *** is necessary to consider the effects of depositional environments and diagenesis on these geochemical parameters.

关键词： Qiongdongnan Basin trace elements stable isotope values anaerobic oxidation of methane methane activity

Empirical Analysis of Xinjiang's Bilateral Trade: Gravity Model Approach

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2008年第1期18卷 9-16页

作者： chen xuegang YANG Zhaoping LIU Xuling Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

Based on the basic trade gravity model and Xinjiang's practical situation, new explanatory variables (GDP, GDPpc and SCO) are introduced to build an extended trade gravity model fitting for Xinjiang's bilateral trade. From the empirical analysis of this model, it is proposed that those three variables affect the Xinjiang's bilateral trade posi- tively. Whereas, geographic distance is found to be a significant factor influencing Xinjiang’s bilateral trade negatively. Then, by the extended trade gravity model, this article analyzes the present trade situation between Xinjiang and its main trade partners quantitatively in 2004. The results indicate that Xinjiang cooperates with its most trade partners successfully in terms of present economic scale and developing level. Xinjiang has established successfully trade part- nership with Central Asia, Central Europe and Eastern Europe, Western Europe, East Asia and South Asia. However, the foreign trade development with West Asia is much slower. Finally, some suggestions on developing Xinjiang's for- eign trade are put forward.

关键词： trade gravity model extended trade gravity model bilateral trade Shanghai Cooperation Organization (SCO) Xinjiang

Discovery and characterization of a new hydrothermal field at 2°N on the slow-spreading Carlsberg Ridge

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2024年第4期42卷 1106-1118页

作者： Zhongyan QIU Yejian WANG Xiqiu HAN Honglin LI Xing YU Ruyong CUI Mou LI xuegang chen Jiqiang LIU Key Laboratory of Submarine Geosciences&Second Institute of Oceanography Ministry of Natural ResourcesHangzhou 310012China Qingdao Institute of Marine Geology China Geological SurveyQingdao 266071China School of Earth Science Zhejiang UniversityHangzhou 310027China Ocean College Zhejiang UniversityZhoushan 316021China

A new hydrothermal field(Tianshi)was discovered on the rift valley wall through plume anomaly surveys and geological work conducted in 2012 and 2018 between 2°35′N and 2°43′N of the slow-spreading Carlsberg Ridge(CR).Here,the results of two expeditions conducted to detect and characterize the new hydrothermal field are *** and geochemical data,as well as 14 C ages of a sediment core collected near the field are presented to reveal the hydrothermal *** show that the Tianshi field is a basalt-hosted hydrothermal *** data of the sediments collected near the field indicate a strong hydrothermal contribution,and hydrothermal Fe and Cu fluxes range from 30 to 155 mg/(cm^(2)·ka)and 0.59 to 11.49 mg/(cm^(2)·ka),*** variations in the fluxes of hydrothermal Fe indicate that there have been at least three amplified hydrothermal venting events(H 1,H 2,and H 3)in the Tianshi field over the last 35.2 ka,in 28.6-35.2 ka BP,22.0-27.6 ka BP,and 1.2-11.4 ka BP,*** event H 2 was driven by an increased magmatic production associated with sea level fall during the Last Glacial Maximum,while event H 3 was promoted by tectonic activity associated with a rapid sea level *** study further verified the role of sea level change in modulating hydrothermal activity on mid-ocean ridges.

关键词： plume anomaly sediment core new hydrothermal field hydrothermal history Carlsberg Ridge

Trends of carbon and nutrient accumulation through time in the Andong salt marsh,Hangzhou Bay,China

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2023年第6期41卷 2134-2145页

作者： Pei Sun LOH Aimin JIN Zhanghua LOU xuegang chen Shuangyan HE chen-Tung Arthur chen Stephanie PARKER Jianxiong HU Hongwei YUAN Longxiu chenG Department of Marine Sciences Ocean CollegeZhejiang UniversityZhoushan 316021China Department of Oceanography National Sun Yat-sen UniversityKaohsiung 804China

Salt marshes are important carbon and nutrient sinks that are threatened by climate changes and human *** this study,the accumulation rates of sedimentary total organic carbon(TOC),total nitrogen(TN),and total phosphorus(TP)from two cores in the Andong salt marsh,Hangzhou Bay,were investigated to determine whether TOC,TN,and TP show increasing or decreasing trends toward the *** TOC accumulation rates at the relatively lower marsh were lower during 1990-1996(1.63-2.37 g/(cm^(2)·a))than 1997-2014(1.15-4.30 g/(cm^(2)·a)).The TN accumulation rates increased from 1990(0.14 g/(cm^(2)·a))toward 2012(0.40 g/(cm^(2)·a)),then decreased toward 2014(0.16 g/(cm^(2)·a)).The TP accumulation rates were lower during 1990-1999(0.10-0.21 mg/(cm^(2)·a)),and decreased from 2000(0.32 mg/(cm^(2)·a))toward 2014(0.15 mg/(cm^(2)·a)).The TOC accumulation rates along the relatively upper marsh during 1982-1992(1.18-3.25 g/(cm^(2)·a))were lower than during 1998-2010(2.30-4.20 g/(cm^(2)·a)),and then decreased toward 2015(2.15 g/(cm^(2)·a)).TN increased from 1982(0.18 g/(cm^(2)·a))to 2005(0.41 g/(cm^(2)·a)),then decreased toward 2015(0.22 g/(cm^(2)·a)).TP accumulation rates fluctuated within a narrow range during 1982-1997(0.21-0.41 mg/(cm^(2)·a)),increased from 1998(0.50 mg/(cm^(2)·a))to 2004(0.87 mg/(cm^(2)·a)),then decreased to 2015(0.38 mg/(cm^(2)·a)).Thus,increases in accumulation rates of TOC,TN,and TP from the 1980s to 1990s indicates that the marsh likely served as carbon and nutrient sinks,then the rates decreased during 2000-2015 due probably to the reduced sediment inputs from rivers and intensified sea level rise.

关键词： wetland climate change anthropogenic activity marsh degradation

基于云计算的网络舆情藤蔓式串并行聚类方法研究

在线全文

学校读者我要写书评

暂无评论

情报杂志 2017年第2期36卷 122-126,107页

作者：陈雪刚湘南学院软件与通信工程学院郴州423000

[目的/意义]针对目前在线网络海量信息难以快速获取其舆情的问题,为有效提升舆情获取速度,提出一种基于云计算的网络舆情藤蔓式串并行聚类方法。[方法/过程]首先构建舆情文本相似性度量模型,并设计确定舆情最佳聚类阈值的方法,以度量舆... 详细信息

[目的/意义]针对目前在线网络海量信息难以快速获取其舆情的问题,为有效提升舆情获取速度,提出一种基于云计算的网络舆情藤蔓式串并行聚类方法。[方法/过程]首先构建舆情文本相似性度量模型,并设计确定舆情最佳聚类阈值的方法,以度量舆情信息间的相似性及确定舆情最佳聚类阈值;然后构建舆情藤蔓式串并行聚类模型,以一个舆情主题为聚类起始,之后如藤蔓的主干自动分支和延伸样,自主扩展舆情聚类主题,并根据舆情信息间的相似性和聚类阈值聚类同主题的舆情信息;最后在舆情藤蔓式串并行聚类模型的基础上,利用云计算的并行计算能力,快速、准确地聚类各主题的舆情信息。[结果/结论]实验结果表明:该方法能快速获取网络舆情,且具有较高的舆情聚类准确度,可为在线网络舆情实时监控提供一定的方法支持。

关键词：在线网络舆情云计算文本相似性藤蔓式串并行聚类

基于大数据技术的微博舆情快速自聚类方法研究

在线全文

学校读者我要写书评

暂无评论

情报杂志 2017年第5期36卷 113-117页

作者：陈雪刚湘南学院软件与通信工程学院郴州423000

[目的/意义]针对海量的微博舆情信息及微博在网络舆论场中的重要作用,如何快速、准确地获取微博舆情,是提升网络舆情实时监测及分析能力的关键课题之一。目前已能以较高的准确度获取微博舆情,但仍存在舆情获取耗时长问题,为较有效地解... 详细信息

[目的/意义]针对海量的微博舆情信息及微博在网络舆论场中的重要作用,如何快速、准确地获取微博舆情,是提升网络舆情实时监测及分析能力的关键课题之一。目前已能以较高的准确度获取微博舆情,但仍存在舆情获取耗时长问题,为较有效地解决该问题,提出一种基于大数据技术的微博舆情快速自聚类方法。[方法/过程]该方法首先利用大数据技术抓取和处理海量的微博舆情信息,而后根据构建的微博文本相似度速算模型和文本自主聚类模型快速自主聚类微博舆情。文本相似度速算模型通过两文本间同名的特征词数与其特征词数量较小值的比值来度量文本相似度;而文本自主聚类模型以一个主题为聚类起始,自主自适应扩展聚类主题,并将文本相似度大于设定阈值的文本直接聚为一类。[结果/结论]实验结果表明:提出的微博舆情快速自聚类方法能快速、准确地获取微博舆情,且具有较低的舆情误报率和漏报率,可为网络舆情实时监测及分析能力的提升提供一定的方法支持。

关键词：微博舆情大数据技术文本相似度快速自聚类特征词