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典型草原地区旅游发展对植被的环境影响 总被引：2，自引：1，他引：1
本文以内蒙古自治区四子王旗格根塔拉草原旅游中心为研究区,利用生态学中的密度、盖度、频度、重要值以及采用辛普森多样性指数（Simpson’s diversity index）和香农－威纳指数（Shannon-Weiner index）来分析植物样方的植物种类多样性,结合样方的种类组成和盖度等来探究旅游发展对草原植被的环境影响。通过旅游活动对植物种类的影响、对植物种类多样性的影响、对群落结构的影响、对群落外貌的影响分析,得知旅游活动对植被生态安全干扰的破坏在Ⅲ级以上,群落由克氏针茅占优势转变为以冷蒿为主的草原变型,今后必须加强对草原旅游开发与规划理论以及开发模式的研究。 相似文献
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旅游干扰对草原旅游点植被的影响——以内蒙古希拉穆仁草原金马鞍旅游点为例 总被引：1，自引：0，他引：1
近年来,随着内蒙古希拉穆仁草原旅游区旅游设施的不断建设和旅游活动的增加,其草原环境岛屿化现象严重。为保护草原景观和当地生态环境,探索草原旅游干扰的基本特点和规律具有十分重要的意义,也可为调控旅游干扰和实施规划与管理提供重要依据和理论支撑。在诸多的旅游干扰影响因素中,游客的活动和践踏以及车辆的碾压是草原旅游点及周边旅游环境产生变化的直接影响因素,而其影响又直接反映在该立地上的植被生长、发育和演替变化上。本文采用植物样方调查法对草原旅游点周围、不同活动区周边、不同等级道路上的植物种类构成与各种植物的相对密度、植被的总盖度、草群高度、植被地上生物量以及丰富度指数等进行了调查分析,以其相关指标变化来探究旅游干扰对草原旅游点植被的影响。 相似文献
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青藏地区草原旅游活动环境影响比较研究——以玛曲草原为例 总被引：1，自引：0，他引：1
发展生态旅游是青藏草原区的一种保护性开发策略,减轻旅游环境影响是青藏地区草原生态旅游发展的内在要求。通过实地调查,评价青藏地区草原各主要旅游活动方式的环境影响程度,分析各种旅游活动的环境影响机制。结果表明:文化参与的环境影响最小,其次是游览观光,再次是休闲度假;各种旅游活动中人均草地资源占用额度、及污染物排放量不同是导致其环境影响差异的主要原因。在青藏地区草原旅游发展中,以减少旅游环境影响为目的,应发挥特色旅游资源对文化参与及游览观光旅游方式的诱导作用及对游客的聚集作用,利用市场需求推动环境影响小的旅游方式的发展,通过科学规划引领旅游业环境友好型发展方向,并强化地方政府在环境保护方面的引导和约束职能。 相似文献
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对襄汾县溃坝区下游覆盖区与未覆盖区土壤理化性质的测试分析结果表明：覆盖区土壤的机械组成砂质土含量大于壤质土,出现偏砂质化。不同区土壤的pH值、速效钾含量变化不明显,但有机质含量发生了一定的变化。覆盖区土壤的有效磷含量明显低于未覆盖区土壤中的含量。覆盖区上的溃坝物不仅影响了土壤的理化性质,对小麦的生长状况也有明显影响。 相似文献
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放牧对草地生态系统土壤理化性质的影响 总被引：5，自引：0，他引：5
本文介绍了放牧对草原土壤物理性质(容重、渗透率)、化学性质(有机质、N素)的影响。由于草原土壤系统本身的复杂性、滞后性和弹性,放牧对土壤性质的影响不尽相同。为了保护草原的土壤资源,应改变只注重草原的经济功能(获取各种畜产品)的观念,而更应注重发挥草原的生态功能和社会功能,使草原得到修养生息。 相似文献
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塔里木河上游典型绿洲不同土地利用方式下土壤质量评价 总被引：11，自引：0，他引：11
以塔里木河上游阿拉尔垦区为靶区,选择8a棉田、30a棉田、人工林、天然林、荒草地、撂荒地及盐碱地等不同土地利用方式的样地为研究对象,综合考虑土壤物理、化学和生物学性质,选择土壤含水量、容重、pH、有机质、全氮、速效磷、速效钾等7个理化指标和过氧化氢酶、多酚氧化酶、碱性磷酸酶、脲酶、转化酶等5个酶活性指标进行实验室分析并解析其分异规律;基于因子分析和聚类分析法评价绿洲不同土地利用方式下土壤质量的差异并划分等级。研究表明,不同土地利用方式下的土壤的理化性质和酶活性均存在一定差异;不同土地利用方式下的土壤质量的评价结果显示：天然林〉人工林〉8a棉田〉30a棉田〉撂荒地〉荒草地〉盐碱地;不同土地利用方式对土壤性质影响的空间差异有助于解释人-地关系的复杂性。 相似文献
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一、我国西部草原旅游发展现状分析我国西部经济相对落后,旅游业发展相对迟缓,再加上草原分布区大都地处偏远,远离区域经济中心,因此西部草原旅游的发展更加缓慢。1、西部草原旅游区旅游开发程度低跟东部的旅游景区相比,西部草原旅游区的开发相对较晚。跟西部其他类型的旅游景区相比,草原旅游区的开发程度相对较弱。因此无论是在大的地域范围还是在小的地域范围内,西部草原旅游区均受到其他旅游景区的形象遮蔽。旅游地之间 相似文献
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额尔敦格日乐 《内蒙古科技与经济》2005,(17):51-52
本文以格根塔拉草原旅游景区为例,分析内蒙古草原景区的深入开发对原本脆弱的草原生态环境产生的负面影响,指出旅游业也应借鉴游牧生活方式,走生态旅游的道路,设计既有吸引力又对环境压力小的旅游产品,合理规划旅游景区内的旅游活动,达到生态、经济、社会协调发展的目的. 相似文献
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张莉杰 《内蒙古科技与经济》2014,(7):8-10
文章认为,草原旅游近年逐步成为与城市旅游、乡村旅游并驾齐驱的三大旅游热点之一,但草原旅游业正面临着旅游资源利用程度不高、旅游资源整合不够、旅游品牌知名度不高、发展方式比较粗放、旅游基础设施建设滞后、旅游企业不大不强等各种问题。走草原旅游的品牌化发展战略可以摆脱当前的发展困境,实现经济与社会效益的双赢,并据此提出了草原旅游品牌化发展的政策建议。 相似文献
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A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
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A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
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Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
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Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
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Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献
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Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献