典型喀斯特石漠化地区表土孢粉与现代植被关系   总被引：1，自引：1，他引：0  

郝秀东  欧阳绪红  谢世友  石胜强  李林立  罗伦德 《地理科学》2011,31(6):758-763

喀斯特石漠化地区6个不同植被类型的25个表土和苔藓样品的孢粉分析表明:(1)研究区植物孢粉共由47科属组成,以草本和蕨类植物占据优势,含量为23.62%~76.47%,其次是乔木[主要为马尾松(Pinus masso-niana)],含量为17.73%~74.05%,灌木植物花粉含量最低,为0~12.50%,显示该区植被退化严重;(2)研究区不同植被类型的表土孢粉组合差别明显,与其相应的实际植被情况大致相同,基本反映了石漠化地区现代植被的基本状况,表明孢粉可以为该区恢复和重建自然生态环境提供参考性依据。  相似文献   

高密度电法在柳州太阳村镇岩溶塌陷区调查中的应用研究   总被引：1，自引：0，他引：1  

郑智杰 《地质与勘探》2017,53(1):124-132

为了查明柳州太阳村镇岩溶塌陷形成的地质背景,本文采用高密度电法对该塌陷区进行调查研究。研究结果表明:高密度电法对于确定土层的厚度,区分土层和岩石的分界面具有较好的效果,通过电阻率的分布及变化趋势,可以较好的圈定地下岩溶裂隙带的发育位置,结合地质资料,对识别断裂破碎带也有较好的效果。三个塌陷区的致塌地质背景不尽相同:第Ⅰ,Ⅲ塌陷区塌陷的形成与人类活动密切相关,分别由机井抽水及输油管道铺设引发;第Ⅱ塌陷区塌陷的形成与自然因素相关,由断裂破碎带触发。通过高密度电法反演结果断面图,能较准确地查明塌陷的潜伏隐患区:第Ⅰ塌陷区的隐伏区为通过抽水井的近东西向的岩溶裂隙带,第Ⅱ塌陷区地质灾害的潜伏区为断层西侧的岩溶裂隙带,第Ⅲ塌陷区的隐患区为输油管道附近东侧的岩溶裂隙带,均位于人类活动频繁附近地段及构造发育带。  相似文献   

四川省青川县红光集镇泥石流灾害特征及减灾对策   总被引：1，自引：0，他引：1  

唐川  杨永红  李为乐 《地质灾害与环境保护》2009,20(2):94-98

2006年8月28日四川省青川县红光集镇发生了泥石流灾害,造成了严重财产损失,并对红光集镇居民安全构成了威胁。本文根据现场调查,分析了泥石流形成条件、成灾过程,并计算了泥石流的容重、流量、冲出量等动力学参数。根据红光集镇泥石流的具体情况和当地经济、社会、生态建设的需要,以及被保护对象的重要性,提出了减灾对策。  相似文献   

Primary analysis on women’s status of renhe town,baiyun district,guangzhou     

Ling Li 《中国地理科学(英文版)》1995,5(2):175-184

There are more women than men in Renhe Town, about 40% of women have jobs. Young women under 30 years old are mainly industrial workers. The average years of education for all women over 6 years old are 6.03, but for man they are 7.64. The Women’s Federation of Renhe Town is a vital organization. What it has done plays an active role in raising women/s social status and encouraging women to take part in the community life. In the past, women mainly participated in different collective agricultural labour assigned by their carders. Women had not much chance to show their intelligence and wisdom. Since the policy of ’ reform and open door to the outside world’ was carried out women have had more and more chance to bring their abilities into full play and many women become capable persons of different trades and professions. Now, in Renhe, women are the main force of factories and dispensable part of all kinds of production work done in units of families.  相似文献   

宁南县城后山泥石流综合治理     

李德基  欧阳强  王士革 《山地学报》1990,(4)

宁南县城后山有8条泥石流沟。其中3条一旦暴发泥石流,就直接威胁着县城的安全。为使县城免遭泥石流为患,1985—1989年县上在有关科研单位参与和支持下,对后山泥石流采取了工程措施、生物措施和预警、管理措施,加以综合治理。治理工程取得的防灾效益、水保效益与经济效益明显。  相似文献   

集镇体系与乡村市场网络研究──以山东省滕州市为例   总被引：2，自引：0，他引：2  

张继宏  郭焕成 《地理研究》1996,(4)

乡村市场网络是乡村市场活动及各种市场流的地域组织形式，本文以滕州市为例研究了乡村市场网络的节点体系、组织结构、市场区域划分与线网体系，探讨了滕州市乡村市场网络基本特征，在此基础上对乡村市场网络的组织优化进行了初步的尝试，并提出了相应的优化建议。  相似文献   

基于RS和GIS技术下城镇空间变化分析及应用研究   总被引：16，自引：7，他引：16  

周可法  吴世新 《干旱区地理》2002,25(1):61-64

城镇空间变化分析，是城镇发展趋势分析的基础，对城镇远景规划有十分重要的指导作用。它也是区域生态环境演变调控研究的重点内容和基础内容。本文将引用RS和GIS技术方法对城镇空间变化进行研究。其基本思路是，利用RS的TM卫片数据进行宏观监测，再利用GIS的空间分析功能，方便地进行城镇分布状况和迁移变化的空间分析与评价。该技术方法已被成功地应用于新疆城镇分布状况及动态变化研究项目中，收到较好效果。  相似文献   

Relationship between the rise and decline of ancient Loulan Town and environmental changes     

袁国映  赵子允 《中国地理科学(英文版)》1999,9(1):78-82

AncientLoulanTOWnwasafamoustownontheSilkROadinthehistory,butsuddenlydisappearedfromthehistoricalrecords1400yearsago.Untilthespringof1900,Aierdeke,theUygurguideoftheexploringpartyledbyMr.SVehHedin,aSWedishexplorer,discoveredthismystery,whichmadeasensationintheworld.Afterwards,alotofexplorersathomeandabroad,E.NuntingtrnfromAmerica(1905),SirAureSteinfromEngland(1906,Igl4),azureOtanietal.fromJapan(1908--1911)wentthereoneafteranotherandthelastinvestigationofwidescopewasdonebyanarchaeologi…  相似文献   

Gay men, leisure space and South African cities: the case of Cape Town     

Gustav Visser 《Geoforum》2003,34(1):123-137

In response to the current paucity of geographical research into post-apartheid development of gay leisure space, the paper focuses on the nature and extent of gay leisure space development in De Waterkant, South Africa’s first “gay village”, located in the Cape Town CBD periphery. Despite a new liberal constitutional environment, the gay spaces generated in post-apartheid De Waterkant are not inclusive of most gay South Africans. On the contrary, the legacy of apartheid race, gender and class inequality persists, generating a wealthy, White, male leisure space enclave. As a consequence, De Waterkant’s potential to function as a site of identity formation, development and re-affirmation, seen in many gay villages found in other Western societies, appears unlikely.  相似文献   

Unique recovery stage of reef communities after F/F event in a huge coral reef of Carboniferous, Southern Guizhou,China   总被引：7，自引：0，他引：7  

GONG Enpu  YANG Hongying  GUAN Changqing  SUN Baoliang & YAO Yuzeng Department of Geology  Northeastern University  Shenyang  China 《中国科学D辑(英文版)》2004,47(5)

Carboniferous is a global recession period of reef-building. There were fewer reefs at that times due to massive extinction and the great glacial catastrophe in the southern hemisphere in Frasnian/Famennian[1]. So far, however, most of the researches concerning Carboniferous reefs have been limited, which leads to insufficient knowledge regarding the composition, structure, ecological characteristics of reef-building communities, the reef growth models, etc. Interna-tional studies conducted o…  相似文献