Protected areas in mainland Southeast Asia, 1973–2005: Continuing trends     

Steve Déry  Romain Vanhooren 《Singapore journal of tropical geography》2011,32(2):185-202

Since the 1970s, protected area networks in mainland Southeast Asian countries have developed significantly to occupy 4–25 per cent of their respective national areas, located mostly in the mountainous domains of ethnic minority peoples. Through this process, regions that were only nominally part of national geobodies until the 1950s have become more territorially integrated. The complexity of the characteristics and geographical impacts of this territorialisation have yet to be grasped. As a step in this direction, we briefly outline a multilevel systems approach that usefully contextualizes these issues together with a historical and cartographical assessment of the evolution of protected area networks for Burma, Thailand, Laos, Cambodia and Vietnam. Our main findings are intertwined. On the one hand, protected areas represent a new tool of state intervention in mountainous areas, clearly in keeping with past, notably colonial, actions. On the other hand, this evolution in state territorialisation and attendant power relations have disrupted, far more deeply than previous actions, the pre‐1970s sociogeographical organization in mountainous areas, where most of the region's residual forests remain.  相似文献   

Patterns of alien plant invasions in northwestern Patagonia, Argentina     

K.L. Speziale  C. Ezcurra 《Journal of Arid Environments》2011,75(10):890-897

Invasive plant species are a growing concern in many regions of the world, yet little information is available on the effects of habitat type and distance to urban settlements on the ability of alien plants to become established. We studied plant communities from the arid steppes to the Andean forest within two national parks and surroundings, in northwestern Patagonia, Argentina. Alien and native vascular plant species were sampled using 90 × 100 m² plots and analyzed in relation to both climatic and environmental variables and distance to urban centres. We also compared life-forms of alien and native species. Precipitation and distance to an urban centre were important determinants of alien species community richness and composition, and shrubland sites had significantly more alien species than forest or steppe sites. Alien flora (15% of the species) was composed of a higher proportion of annuals and biennials than native flora. Our results suggest that precipitation, distance to source population, and anthropogenic disturbance influence the invasion process in this region, together with the availability of open niches. This work stresses the importance of monitoring invasive species in natural reserves, and of considering habitat types as well as idiosyncratic characteristics of the non-natives for developing management strategies.  相似文献   

中国西南山区资源环境安全态势评价   总被引：4，自引：0，他引：4  

张继飞  邓伟  刘邵权 《地理研究》2011,30(12):2305-2315

选择西南山区5省市区（广西、重庆、四川、贵州和云南）作为研究区域,遵循“压力-状态-响应”框架构建评价指标体系,运用熵权-模糊综合评价方法对西南山区5省近11年来的资源环境安全总体态势进行了初步综合评价。结果表明：研究时段内,西南山区资源环境安全整体水平较低,但区域内各省的资源环境系统呈现良性发展趋势;资源环境综合安全...  相似文献   

采用综合物探和钻探方法查明章丘矿山采空区   总被引：1，自引：0，他引：1       下载免费PDF全文

刘建胜  李树荣  王爱民 《山东国土资源》2007,23(3):17-20

采空区与围岩具有明显的波阻抗界面,为应用地震反射波法、瞬态面波法及电阻率测深法在采空区的勘测,具备了有利的物理前提和应用条件。通过现场钻探验证,揭示采空区的空间位置,对下步设计工作具有指导意义。  相似文献   

Rehabilitation and Sustainable Use Pattern of Rocky-desertified Land in Southwest China’s Poverty-stricken Karst Mountainous Areas——A Case Study in Benggu Township, Xichou County, Yunnan, China   总被引：1，自引：0，他引：1  

《山地科学学报》2006,(3)

Introduction Rocky desert is a distinguishing phenomenon in China’s subtropical karst region, and it is caused by serious soil erosion, large areas of bedrocks protruding above soil, or alternatively large amount of gravels piling up in the field, leading to reduction or complete loss of soil productivity. This is a form of surface soil deterioration similar to desert (WANG 2002, WANG et al. 2004). Now the rocky desert is being expanded at an astonishing speed, and now it accounts for 30 …  相似文献   

昌邑市地下水开发及其环境地质效应研究   总被引：1，自引：0，他引：1  

卫政润  张涛  韩晔 《山东国土资源》2007,23(5):11-14

昌邑市不合理的地下水开发引发了一系列环境地质效应,如地下水降落漏斗、海水入侵等。分析了昌邑市地下水开发现状及其引发的环境地质效应,提出了合理调整用水布局、人工回灌补源、修建地下水库、建立完善的预警预报体系等措施,为资源型缺水的滨海地区提供了地下水开发与保护的科学依据。  相似文献   

SUSTAINABLE URBAN-RURAL RELATION IN RAPID URBANIZATION AREAS——Case of Transformation of "Urban Village" in Guangzhou     

《中国地理科学(英文版)》2005,15(3)

1IN T R O D U C T IO NDue to acceleratingurban sprawl and suburbanizatio,nlargeareaoffarmlandwere changed intonon-agricultur-allanduse sincethelate1990s,especiallyinSouth Chi-na.Meanwhile some villageswere surrounded by urbanbuilt-upareasand became"thevillagesin urban area",which arenamed hereas"urban villages."Specificallyindefinitio,nurban villageisa ruralcom munity inurbanbuilt-upareasbecause of drasticurban sprawl,subur-banizationand industriadlispersion.A nd inrealityur-ban villagee…  相似文献   

Wadi flow in the Arabian Gulf states     

M. Nouh 《水文研究》2006,20(11):2393-2413

Real data on wadi flood flows from Saudi Arabia, Yemen, Oman, Kuwait, UAE, Bahrain and Qatar were used to develop methodologies for the prediction of annual maximum flows and average monthly flows in the Arabian Gulf states. For the prediction of annual maximum floods, three methods have been investigated. In the first method, regional curves were developed and used together with the mean annual flood flow, estimated from the characteristics of the drainage basin, to estimate flood flows at a location in the basin. The second method fits data to various probability distribution functions, with a developed methodology introduced to account for floods generated by more than one system of climate, and the best fitted function was used for flood estimates. In the third method, only floods over a threshold, which depends on characteristics of the drainage basin, were considered and modelled. For the prediction of average monthly flows, stochastic simulation approaches of flood frequency analysis were used. Each of the prediction methods was verified by being applied in 40 different drainage basins. Based on the results obtained, recommendations were made on the best method to be applied (at present) by design engineers in the Arabian Gulf states. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

On a property of zero-velocity curves in N-body ring-type systems     

T.J. Kalvouridis 《Planetary and Space Science》2004,52(10):909-914

Zero-velocity curves are a useful tool in the investigation of various aspects of a dynamical system. These curves that distinguish the regions where the motion of a particle is permissible from the regions where this motion is not permitted, present some basic properties. In this paper, we prove that in symmetric ring-type systems where a small particle moves under the resultant gravitational field of N coplanar big bodies, of which ν=N−1 are arranged at equal distances among them on the periphery of a circle, a new property concerning these curves, exists. All the zero-velocity curves drawn in the space of the initial conditions (x₀,C) and concerning configurations with the same number of peripheral primaries but various mass parameters, pass through two different focal points, the position of which does not depend on the value of the mass parameter.  相似文献   

Evaluating consumer preferences for health care services in rural Australia     

《The Australian geographer》1991,22(1):44-56

Service provision to remote rural areas is extremely costly, and only likely to be effective if the services provided are appropriate and accessible to the population. To date, little is known about the attitudes of rural residents (both townsfolk and the farming population) to various services. This study examines people's attitudes towards services generally, and health services in particular, and relates their attitudes to sociodemographic variables and geographical location. The results show the overwhelming importance attributed to health services, particularly medical services, and that attitudes differ significantly according to place of residence and by age group. These findings have major implications for those responsible for formulating policies relating to service provision for rural areas.  相似文献