中国公路自然区划的回顾与展望     

苗英豪  王秉纲  MIAO Yinghao  WANG Binggang 《地理学报(英文版)》2004,14(Z1)

1IntroductionHighway, as a kind of man-made structure, will become a part of the geographical environment and be impacted by all sorts of natural factors after it is finished. On the other hand, highway also brings some changes to the geographical environment. A highway often passes through different natural regions, so it must be adaptable to any geographical environments. On the basis of deep understanding of the geographical environment, service life and normal level of the highway can be e…  相似文献   

祁连山区天然草原退化原因分析与可持续利用对策   总被引：23，自引：5，他引：23  

赵成章  樊胜岳  殷翠琴 《中国沙漠》2004,24(2):207-210

天然草原是畜牧业发展的重要物质基础，由于缺乏有效的制度安排和技术创新，人类无节制的赢利活动加剧了草原退化，导致了西部生态环境的恶化。论文以祁连山区的肃南县为例，通过对天然草原退化现状的调查研究，剖析了祁连山区草原生态环境保护与经济发展之间的突出问题和草原退化的深层原因，提出了天然草原永续利用的对策。  相似文献   

中国热带近百年气候波动与灾害     

黄镇国  张伟强  HUANG Zhenguo  ZHANG Weiqiang 《地理学报(英文版)》2004,14(Z1)

The temperature appeared rising trend during the 20th century in China's tropics.Two cooling stages and two warming stages in the process of climatic fluctuation can be recognized.After the 1980s the climate is the warmest which corresponds to the global change,but the warmest period is the 1940s in Kunming.The climate pattern mostly appears contemporaneity of warming and humidity,which is different from the situation of whole China.The natural disasters tend to be aggravated.The number of typhoons increased.Flood damages occurred frequently in the years of more typhoons.The number of droughts and cold damages increased.It was snowed in Guangzhou.There was frost in Haikou and Yaxian.Four years of heavy snow have been recorded in Kunming.  相似文献   

RURAL DEVELOPMENT IN EL HATILLO, NICARAGUA: GENDER, NEOLIBERALISM AND ENVIRONMENTAL RISK     

Julie Cupples 《Singapore journal of tropical geography》2004,25(3):343-357

El Hatillo is a rural community in the Sébaco valley in Nicaragua, which suffers from an eroding resource base, high levels of poverty and malnutrition, and a high susceptibility to hazards. Structural adjustment policies have been devastating for small and subsistence farmers and have increased the level of economic, social and environmental marginalisation in rural Nicaragua. This paper explores initiatives to promote sustainable development in Nicaragua in the context of structural adjustment and environmental degradation. Drawing on qualitative research conducted in El Hatillo, it outlines the ways in which women in this community are attempting to address the multiple challenges of rural poverty and environmental risk and considers the potential of these strategies for gender equality.  相似文献   

The Victorian Bushfires of 2002–03 and the Politics of Blame: a Discourse Analysis     

JOSH WHITTAKER  DAVID MERCER 《The Australian geographer》2004,35(3):259-287

This paper identifies contrasting environmental discourses on bushfire from the public debate that followed the Victorian fires of 2002–03. Submissions to the inquiry into the 2002–03 Victorian bushfires provide a particularly rich source of documentation. It is argued that environmental events such as bushfire only become political issues, or problems, when they are constituted as such through environmental discourse. Through the analysis, three contrasting discourses on bushfire are identified—here labelled the ‘conservationist’, ‘ruralist’ and ‘wise use’ discourses. In examining how different ‘constructions’ of bushfire have led to conflict, each discourse is shown to consist of a range of actors who draw on shared storylines. Having established a better understanding of the different attitudes, beliefs, interests and values that underpin debates about bushfire, the paper concludes with a brief discussion of the prospects for compromise among the discourses and the potential for improved land and fire management outcomes.  相似文献   

The Quantitative Identification of Regional Mine and Natural Earthquakes and Its Application     

Liu Xiqiang 《中国地震研究》2005,19(3):269-281

INTRODUCTIONThe structural mine earthquake in coal mines refers to the quake induced by excavationengineeringthatleadstorupturingor change of geological structure and weakness surfaceintheinteriorof rock mass.According to the origin,mine earthquakes can b…  相似文献   

‘Committing to Place’ at the Local Scale: the potential of youth education programs for promoting community participation in regional natural resource management     

Ruth Lane  Damian Lucas  Frank Vanclay  Sophie Henry  Ian Coates 《The Australian geographer》2005,36(3):351-367

Emerging approaches to environmental governance require a greater level of community participation than did previous approaches in which these responsibilities largely rested with government agencies. There is consequently a need for increased engagement with NRM among a broad community sector. This paper examines initiatives by two prominent government agencies, the Murray–Darling Basin Commission (MDBC) and the National Museum of Australia (NMA), to engage school children from regional communities using education programs that focus on place and environmental health. We focus on the MDBC's International Riverhealth Conference held in Mildura in 2003 and the associated Murray–Darling Basin TalkBack Classroom sponsored by the NMA and the Parliamentary Education Office (PEO). We explore how key themes of local scale, place-based identities, youth voice and critical engagement are developed in these programs and consider how they relate to the environmental agency of children. We then reflect on the potential for the kinds of environmental agency promoted through these programs to help build the capacity of local communities to progress larger goals of environmental restoration and sustainability in the Murray–Darling Basin. The evaluation research reported here forms part of the Committing to Place research project, an Australian Research Council Linkage grant involving the University of Tasmania, the National Museum of Australia and the Murray–Darling Basin Commission.  相似文献   

川西坳陷南段天然气来源与碳同位素地球化学研究   总被引：6，自引：0，他引：6       下载免费PDF全文

樊然学  周洪忠  蔡开平 《地球学报》2005,26(2):157-162

川西坳陷南段是四川盆地主要的天然气产区之一。前人对该区天然气的来源有多种见解。为了更清楚地认识此地区天然气的来源与运移，本文分析了平落坝、大兴西和白马庙气田16件天然气样品的C1-C4烃及CO2组份的碳同位素组成。所获得的同位素数据结合化学成份和地质资料表明，3个气田的烃类完全是热解成因的，都来源于气田下面的上三叠统烃源岩。这些气田的甲、乙烷碳同位素组成随深度呈不同规律的变化，这些变化归因于烃源岩生烃的热解过程和烃类运移的动力学过程。平落坝气田中侏罗统气藏的烃类大部份形成于烃源岩低成熟和成熟的早期阶段并受到晚期成熟气体的不断补给。平落坝和大兴西气田多数气藏的烃类被认为是从源区垂直向上运移通过上伏地层而进入气藏的，白马庙气田的烃类被认为是沿断裂通道向上侏罗统气藏聚集的。平落坝和大兴西气田的δ^13Cco2值有很宽的分布范围(-10.7‰～-0.7‰)，这表明气田的CO2由来自基底的海洋碳酸盐岩无机碳成份和沉积地层的有机碳成份混合而成。这些气田的[He／CH4]-[N2／CH4]值之间和δ^13Cco2-δ^13Cc1值之间的相关性表明，非烃气体在进入气藏前已同烃类很好地混合，并被CH4为主流相的气流携带着向气藏运移。  相似文献   

喀斯特地区旅游开发的自然景观保护--以贵州省绥阳县为例   总被引：3，自引：0，他引：3  

孙强  许学工 《地理与地理信息科学》2005,21(4):75-78

该文以贵州省绥阳县为例，针对我国西南喀斯特地区旅游开发中自然环境的特点，探讨溶洞景观的保护、喀斯特地表生态环境保护、水体的保护与综合治理等问题。  相似文献   

三江并流世界自然遗产地旅游地质景观成景地质作用初步分析     

王嘉学  明庆忠  杨世瑜  彭秀芬 《云南地理环境研究》2005,17(3):53-56,80

三江并流世界自然遗产地丰富独特的旅游地质景观是多种地质作用与不同成景岩组交互叠加作用的结果。其发育的地层基础主要为碳酸盐成景岩组、变质岩成景岩组、碎屑岩成景岩组以及岩浆岩成景岩组等,典型内力成景地质作用为板块缝合作用、断裂成景作用、变质成景作用,外力作用则主要有河流、冰川、丹霞、地热、喀斯特作用等。  相似文献