首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 140 毫秒
1.
The 30th International Geographical Congress (IGC) was held on August 16-20 in Glasgow, the United Kingdom. Approximately 2000 geographers from more than 80 countries and regions participated in the IGC. The Geographical Society of China (GSC) attended the conference with a 60-odd-number delegation from Chinese mainland. Nearly 20 geographers from Taiwan and Kong Kong, as well as overseas Chinese attendees took part in the IGC.Professor Ken Gregory, chair of the IGC 2004 from the …  相似文献   

2.
The 30th International Geographical Congress (IGC) was held on August 16-20 in Glasgow, the United Kingdom. Approximately 2000 geographers from more than 80 countries and regions participated in the IGC. The Geographical Society of China (GSC) attended the conference with a 60-odd-number delegation from Chinese mainland. Nearly 20 geographers from Taiwan and Kong Kong, as well as overseas Chinese attendees took part in the IGC.  相似文献   

3.
正The 33rd International Geographical Congress(IGC 2016)was held in Beijing,China on August21-25,2016.About 5000 participants from 101 countries and regions worldwide attended the congress and related activities.The congress was hosted by International Geographical Union,organized by Geographical Society of China and Institute of Geographic Sciences and Natural  相似文献   

4.
The 32nd International Geographical Congress (IGC) was held on August 26-30 in Cologne, Germany. About 3000 geographers from countries and regions across the world participated in the IGC, which caused an unprecedented number of attendees in the history of IGU. Organized by The Geographical Society of China (GSC), China had a record over 100 geographers to this congress, including Academician Qin Dahe, Vice President of IGU, and Academician Liu Changming, former Vice President of IGU.  相似文献   

5.
Sponsored by the Association of Japanese Geographers （AJG） and jointly undertaken by the Geographical Society of China （GSC） and the Korean Geographical Society （KGS） and Kumamoto University, the Second Japan-Korea-China Symposium of Young Geographers was held at Kumamoto University in Japan on October 2-5, 2007. It was a successful continuation after the First China-Japan-Korea Symposium of Young Geographers launched by the GSC and held at Beijing Normal University in China on September 16-18, 2006. The 2007 project was also completed with the aid of Professor Murayama Yuji, from University of Tsukuba and the Kumamoto International Convention and Tourism Bureau.  相似文献   

6.
The 2014 Regional Conference of the International Geographical Union（IGU）was held on August 18-22 in Krakow,Poland.The total number of participants was 1374 from 64 countries and regions,including 357 from Poland.Germany,Japan,Czech,UK,China,Russia,USA,France and Hungary are the top countries of attendees in this conference.  相似文献   

7.
International Forum on Development and Application of Geographical Sciences: A Retrospect for the Past Three Decades and Prospect was held in Guangzhou University on 19-22, December, 2008. It was sponsored by Guangzhou University, The Geographical Society of China, and Guangdong Geographical Society. More than 200 geographers and graduate students participated in this forum from more than 140 institutions throughout the world, including USA, UK, Australia and across the Taiwan Straits.  相似文献   

8.
The 2008 Annual Meeting of the Geographical Society of China （GSC） was held on July 13-15 in Changchun, Jilin Province of Northeast China. A total of over 1000 geographical researchers and educators from Chinese mainland, Hong Kong, Macao, Taiwan, Australia participated in this meeting. More than 400 papers were submitted and discussed during this academic meeting. This meeting was co-sponsored by the GSC, Northeast Institute of Geography and Agricultural Ecology （NEIGAE） under the CAS, Northeast Normal University, and Institute of Geographic Sciences and Natural Resources Research （IGSNRR） under the CAS. As an important part of the 2008 annual meeting, the 3rd Annual Academic Conference on Geography for Postgraduates was given a response from more than 200 postgraduates in universities and academic institutions.  相似文献   

9.
ZHAOXin 《地理学报(英文版)》2004,14(1):126-128,F003
The Annual Academic Meeting of the Geographical Society of China (GSC) was held on October 17-19, 2003 in Wuhan, Hubei Province. A total of some 560 geographical researchers and educators from across China participated in this event. More than 300 papers were presented and discussed during this annual meeting. The Annual Academic Meeting of the Geographical Society of China is so far the largest scale academic activity of geographical sciences in China.  相似文献   

10.
正The 2014 Regional Conference of the International Geographical Union(IGU)was held on August 18-22 in Krakow,Poland.The total number of participants was 1374 from 64 countries and regions,including 357 from Poland.Germany,Japan,Czech,UK,China,Russia,USA,France and Hungary are the top countries of attendees in this conference.The regional conference was organized by the  相似文献   

11.
Aleppo pine (Pinus halepensis Mill.) is found in discontinuous bands along the Mediterranean Basin, usually at low elevations and in dry climates. This study was conducted to relate bioclimatic zones and geographic distribution with representative individual tree of populations for cone number and weight from the driest to the wettest Aleppo pine forest zones. Epidometric values were recorded in all sample stands in the monitoring plots set in 79 native populations from the Algerian border to the eastern coast of Tunisia, representing a wide range from each region in northern Africa. Simple and multiple regressions were performed on the data. Results showed that the canopy seed bank increased according to elevation, latitudinal and longitudinal gradients. The simple regression analysis showed a latitudinal effect positively relating increasing latitude to greater cone crop. Similarly, longitudinal and elevation variations were related to significant differences in cone dimensions. Higher average seed mass was related to populations located westwards or at higher elevation. The multiple regression analysis indicated that the longitudinal variations were the most determinant geo-positional factors in Aleppo pine cone dimensions and average seed mass in natural Aleppo pine forests in Tunisia.  相似文献   

12.
Ants do not occur in the rocky desert of the Nazca Plain, Peru, except in the vicinity of shrubs in outwash gulleys, where there are two species that have similar activity periods and microhabitats and exhibit interference competition. Only one species of ant was found on the Chott El Djerid, Tunisia, a large, dry salt lake, devoid of vegetation.  相似文献   

13.
Countries should provide regularly national inventories of greenhouse gas emissions and sinks and, and for the agriculture and forestry sectors this comprise national estimates of soil organic carbon (C) stocks. Estimation of soil C stock requires soil bulk density (Db) values. However, direct measurement of Db is often lacking mainly for soils in arid and semi-arid conditions. Much effort has been made in finding alternative solution to predict Db, either improving in situ determinations, either improving estimation procedures based on other soil properties. Regression models or pedotransfer functions (PTFs) based on easily measured soil properties constitute an adequate tool to assess Db, since it needs a minimum data set of indicators. A forward stepwise multiple linear regression routine was used to predict Db from physico-chemical soil properties. In this study, a soil database was organised from published and unpublished data from Tunisia. The database consisted of 238 soil profiles corresponding to 707 soil horizons from Tunisia. A general regression model fitted with all the data showed that OC, Clay, coarse-Sand and pH were the principal contributors to Db prediction (R2 = 0.55, standard error of prediction = 0.14). Additional models based on different set of variables are also provided providing alternative solutions for different levels of soil information. Predictions of the models were often improved when the data were partitioned into groups by soil depth (0–40 and 40–100 cm) and soil orders. This study also showed that CaCO3 might be an important predictor for deeper soil horizon. The proposed PTFs for Tunisia might be useful for a larger range of soil from arid and sub arid regions.  相似文献   

14.
Tunisia is a marginal country hydrologically and it has adopted a number of distinctive methods of water management for agriculture. The central region supports modern dam irrigation, whilst traditional rainwater harvesting is practiced in the south. These contrasting techniques are described and evaluated in terms of sustainability using empirical field data and secondary literature for two study sites. Research focuses primarily on the physical environment, but socio-cultural and economic viability are also examined. Analysis indicates that traditional water management advantageously partitions the continuum dividing hazards and resources through subtle manipulation of the environment. A potentially hazardous environment is rendered secure by resourceful water management based on community action and cumulative knowledge. This practice minimizes community dependency and local economic imbalance. With dam irrigation, carrying capacity is established more forcibly by centralized control in order to place society within world markets. An almost total break from environmental variability is made in the short term, but this can lead to disequilibrium over longer durations. Additionally, the spatial and social distributions of development are uneven. In Tunisia, maintenance of traditional methods can reduce the negative impacts caused by modern programmes and support their positive characteristics. A mix of both methods offers a foundation to sustainable water supply in the new millennium.  相似文献   

15.
The effect of various government policies on migration patterns in Tunisia in the absence of a specific policy on internal migration and spatial distribution is analyzed. A review of possible measures available for altering migration patterns is presented. The author concludes that long-term changes in population distribution can only be achieved by specific migration policies that seek to modify the urban bias in the aspirations of migrant populations or that try to alter fundamentally the structure of national settlement systems.  相似文献   

16.
非洲世界遗产的分布特征   总被引：2，自引：0，他引：2  
以世界文化和自然遗产为主要类型, 通过图表分析和计算密度, 分全洲、地区和国家3 个尺度, 研究非洲世界遗产的分布特征。从全洲看, 非洲大陆沿海和海岛地区、中等河流流域与非洲东部局部区域世界遗产分布相对集中。不同地区中, 东部、北部和西部非洲比较稠密, 其中东部非洲密度最高。各国中, 塞内加尔、突尼斯、冈比亚、佛得角、毛里求斯和塞舌尔密度最高, 其次为科特迪瓦、摩洛哥、多哥、肯尼亚、乌干达、马拉维和津巴布韦等国。世界文化遗产在东部、北部和西部非洲同样密集, 密度较高的有埃及、摩洛哥、突尼斯、贝宁、加纳、塞内加尔、多哥、冈比亚、佛得角、埃塞俄比亚、肯尼亚、马拉维、毛里求斯和津巴布韦等国。世界自然遗产以东部非洲密度最高, 主要分布在突尼斯、尼日尔、几内亚、科特迪瓦、塞内加尔、喀麦隆、中非、民主刚果、坦桑尼亚、肯尼亚、塞舌尔、乌干达、马达加斯加、南非、津巴布韦和马拉维等国。  相似文献   

17.
The diet of the Barn Owl (Tyto alba) is well known in different habitats but a lack of data persists for arid and subarid environments. We provide preliminary information on food selection of barn owls in Tunisia by the analysis of the composition of pellets. The diet consists largely of rodents and the three-toed Jerboa (Jaculus jaculus) that accounted for more than 50% of total prey biomass. Results suggest that barn owls show a nonrandom tendency toward rodent species especially small and young individuals.  相似文献   

18.
Native grass species are being considered in the restoration of degraded rangelands in Tunisia due to the failure of introduced species to adapt to the ecological constraints of the region. The objective of this study was to determine the effects of seed age and seedling depth on emergence and seedling vigor of Stipa lagascae, a perennial bunchgrass that is native to the region and shows promise as a species for restoration purposes. Total emergence percentage of seedlings and the coefficient of rate of emergence (CRE), the seedling vigour as well as above and below-ground biomass were measured. Younger seeds had higher emergence rates than older seeds. However, seed age did not affect variables associated with seedling vigour. Seeding depth significantly affected all parameters tested. A seeding depth of 4–6 cm was found to be optimal.  相似文献   

19.
《Basin Research》2018,30(5):926-941
Constraining the thermal, burial and uplift/exhumation history of sedimentary basins is crucial in the understanding of upper crustal strain evolution and also has implications for understanding the nature and timing of hydrocarbon maturation and migration. In this study, we use Vitrinite Reflectance (VR) data to elucidate the paleo‐physiography and thermal history of an inverted basin in the foreland of the Atlasic orogeny in Northern Tunisia. In doing so, it is the primary aim of this study to demonstrate how VR techniques may be applied to unravel basin subsidence/uplift history of structural domains and provide valuable insights into the kinematic evolution of sedimentary basins. VR measurements of both the onshore Pelagian Platform and the Tunisian Furrow in Northern Tunisia are used to impose constraints on the deformation history of a long‐lived structural feature in the studied region, namely the Zaghouan Fault. Previous work has shown that this fault was active as an extensional structure in Lower Jurassic to Aptian times, before subsequently being inverted during the Late Cretaceous Eocene Atlas I tectonic event and Upper Miocene Atlas II tectonic event. Quantifying and constraining this latter inversion stage, and shedding light on the roles of structural inheritance and the basin thermal history, are secondary aims of this study. The results of this study show that the Atlas II WNW‐ESE compressive event deformed both the Pelagian Platform and the Tunisian Furrow during Tortonian‐Messinian times. Maximum burial depth for the Pelagian Platform was reached during the Middle to Upper Miocene, i.e. prior to the Atlas II folding event. VR measurements indicate that the Cretaceous to Ypresian section of the Pelagian Platform was buried to a maximum burial depth of ~3 km, using a geothermal gradient of 30°C/km. Cretaceous rock samples VR values show that the hanging wall of the Zaghouan Fault was buried to a maximum depth of <2 km. This suggests that a vertical km‐scale throw along the Zaghouan Fault pre‐dated the Atlas II shortening, and also proves that the fault controlled the subsidence of the Pelagian Platform during the Oligo‐Miocene. Mean exhumation rates of the Pelagian Platform throughout the Messinian to Quaternary were in the order of 0.3 mm/year. However, when the additional effect of Tortonian‐Messinian folding is accounted for, exhumation rates could have reached 0.6–0.7 mm/year.  相似文献   

20.
An October–June precipitation reconstruction was developed from a Pinus halepensis regional tree-ring chronology from four sites in northwestern Tunisia for the period of 1771–2002. The reconstruction is based on a reliable and replicable statistical relationship between climate and tree-ring growth and shows climate variability on both interannual and interdecadal time scales. Thresholds (12th and 88th percentiles) based on the empirical cumulative distribution of observed precipitation for the 1902–2002 calibration period were used to delineate dry years and wet years of the long-term reconstruction. The longest reconstructed drought by this classification in the 232-year reconstruction is 2 years, which occurred in the 19th century. Analysis of 500 mb height data for the period 1948–2002 suggests reconstructed extreme dry and wet events can provide information on past atmospheric circulation anomalies over a broad region including the Mediterranean, Europe and eastern Asia.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号