The response of lake change to climate fluctuationin north Qinghai–Tibet Plateau in last 30 years     

Bianduo  Bianbaciren  LI Lin  WANG Wei  Zhaxiyangzong 《地理学报》2009,19(2):131-142

According to the analysis of the climate materials including the topographic map in 1975, the TM and CBERS satellite remote sensing materials from the 1980s to 2005 as well as the air temperature, precipitation, evaporation rate, maximum depth of snow and the biggest depth of frozen soil in the past 45 years, the water level area of four lakes at the southeast of Nagqu, Tibet including Bam Co, Pung Co, Dung Co and Nuripung Co show a distinct trend of expansion in the past 30 years. In 2005, the water level area of the above four lakes increased by 48.2 km2, 38.2 km2, 19.8 km2 and 26.0 km2 respectively compared to 1975, with the respective increase rate of 25.6%, 28.2%, 16.2% and 37.6%. That is closely related to the warming and humidified climate change in the recent years such as rise of the air temperature, increase of the precipitation, decrease of the evaporation rate and permafrost degradation.  相似文献   

牧民自我发展能力评价与培育——以甘南牧区为例     

赵雪雁  巴建军 《干旱区地理》2009,32(1)

牧民自我发展能力是指牧民以可持续的方式理解和应对发展需求的能力.本文以甘南牧区为例,对牧民自我发展能力及其与牧民收入的关系进行了定量评价.得出以下结论:(1)甘南牧区牧民缺乏自我发展能力;(2)牧民自我发展能力更多依赖于牧民生产投资因子及非农就业因子,而知识发展因子、生产效率因子、人力资本投资因子对其贡献率较低;(3)牧民自我发展能力与牧民收入的相关度较高.基于上述研究结论,提出了提高牧民自我发展能力的相关政策建议.  相似文献   

乌鲁木齐及昌吉两城市发展对日照时数的影响分析     

李景林  郑玉萍  赵书琴  孙月琴 《干旱区地理》2009,32(4)

利用1961-2006年的日照资料,分析了近46年来乌鲁木齐市及同一气候区的周边邻近城市和郊区的日照时数变化特征.结果表明:随着城市化的发展,大、中城市的年日照时数是趋于减少,且减少的倾向率与城市发展的速度和规模呈正相关.大城市乌鲁木齐和中等城市昌吉、米泉的日照时数距平百分率分别以4.1%/10 a、2.2%/10 a和2.0%/10 a的趋势递减,米泉的日照时数距平百分率1998年以后呈现为剧减的趋势;而小城镇达坂城的年日照时数距平百分率则以0.8%/10 a趋势递增.城市中日照时数减少最明显的季节为污染排放量大、逆温层厚而强的冬季,其中又以1月份日照百分率减少趋势最为明显.达坂城四个季节的日照百分率均随着年代的推移而增加,其中春季和夏季增加趋势最明显,增加速率分别为1.64%/10 a和0.63%/10 a.在乌鲁木齐及昌吉两城市,除气候变化和天气因素外,影响日照时数变化的主要因子是大气环境.  相似文献   

近30年来藏北高原湖泊变化对气候波动的响应   总被引：7，自引：1，他引：6  

边多  边巴次仁  李林  王伟  扎西央宗 《地理学报(英文版)》2009,19(2):131-142

According to the analysis of the climate materials including the topographic map in 1975, the TM and CBERS satellite remote sensing materials from the 1980s to 2005 as well as the air temperature, precipitation, evaporation rate, maximum depth of snow and the biggest depth of frozen soil in the past 45 years, the water level area of four lakes at the southeast of Nagqu, Tibet including Bam Co, Pung Co, Dung Co and Nuripung Co show a distinct trend of expansion in the past 30 years. In 2005, the water level area of the above four lakes increased by 48.2 km², 38.2 km², 19.8 km² and 26.0 km² respectively compared to 1975, with the respective increase rate of 25.6%, 28.2%, 16.2% and 37.6%. That is closely related to the warming and humidified climate change in the recent years such as rise of the air temperature, increase of the precipitation, decrease of the evaporation rate and permafrost degradation. Foundation: National Natural Science Foundation of China, No.40761005 Author: Bian Duo (1966–), Professor, specialized in application of remote sensing and GIS on environment.  相似文献   

长江三角洲地区经济极化趋势、功能及扩展范围   总被引：2，自引：2，他引：0  

段学军  虞孝感  Josef Nipper 《地理学报(英文版)》2009,19(6):733-749

In the era of economic globalization, the concept of Economic Polarized Area comes into being as an effective vehicle to agglomerate the economic elements and sustain the economic lifeline of the region. Based on the region’s specific development mode and construction form the concept is working in such a way that it will contribute to guide the economic development of the country and will play an important role in competing with other regions or countries in the world. Due to the high speed development of the last 30 years, the Yangtze Delta Region starts to show the features of Economic Polarized Area. But, compared with other world-class Economic Polarized Areas, the economic strength and the ability of the Yangtze Delta Region to drive the country’s economic development is still very low and the competitive power is still very limited. Expanding the boundaries of the Economic Polarized Area of the Yangtze Delta may extend the economic hinterland of the core area of the Yangtze Delta Region, will lighten the pressures from the limited resource and promote the rationalization of the industrial structure in the Yangtze Delta Region’s core area. With regard to the reasonable boundaries of the Yangtze Delta Region, there are different opinions and controversial arguments in political and academic circles. Starting from the idea of increasing the competitive power and improving the economic strength of the Yangtze Delta Region, the paper firstly is discussing the requirements to become a world-class Economic Polarized Area. In a second step an analysis of functional complementation and economic collaboration between the cities of an “extended” Yangtze Delta Region has been carried out by in particular considering the feasibility of integrating these “newly included” cities. The final result of the study is, that the Region should be expanded from the number of 16 cities to 37 cities, and the appended cities should be divided up into two categories: Wenzhou, Jinhua, Yancheng, Huaian, Maanshan, Wuhu, Tongling, Chaohu, Hefei, Chuzhou, Xuancheng should be taken as Preferred Extending Area, and Suqian, Xuzhou, Lianyungang, Lishui, Quzhou, Chizhou, Anqing, Bengbu, Huangshan, Suzhou (Anhui Province) should be taken as Retained Qualification Area.  相似文献   

新疆天山近7级地震前震群活动的时空分布演化特征   总被引：1，自引：0，他引：1  

敖雪明  龙海英  王桂岭 《地震》2010,30(4):124-132

通过普查与系统研究发现, 新疆天山近7级强震之前, 震群活动携带了丰富震兆信息。 主要结果如下: ① 震前1年半至3年多, 包括未来强震震中在内的整个地震带或某一区段震群活动明显增强; ② 在未来强震震中附近, 震群的数量最多且空间分布最为集中, 这些大量密集的震群构成的震群环包围了未来主震震中, 即形成震群空区或空段。 震群空区或空段的几何形状大多为椭圆, 其最大尺度约200 km; ③ 强震之前, 震群数量的多少, 随未来强震震级的增加而增加; ④ 个别强震前几个月, 震群增加的速率有加快的趋势, 同时震群空区内出现填空, 可作为近7级强震进入短期异常阶段的参考标志。 最后, 对所得结果的物理机制以及在地震预报中的应用等问题进行了讨论。  相似文献   

上海青西地区社会经济发展对水环境影响与对策     

钟春节  王铭玮  吕永鹏  徐启新  乐融融 《世界地理研究》2010,19(2):155-161

以上海青西地区为研究对象,研究社会经济发展对水环境影响与对策,结果显示：①1992～2008年,青西地区社会经济高速发展,GDP年均增长率21.6%,工业总产值年均增长率19.1%,外来人口显著增多,从2004年的4.7万人增长至2008年的7.9万人;②地处黄浦江上游水源保护区,青西地区工业发展受到限制,畜禽养殖场被关闭,为水源保护做出较大贡献,但与此同时水源保护也面临社会经济发展带来的较大压力,主要表现在工业污染、农业污染和生活污染等三个方面;③从产业结构升级、污水处理系统建设、农村面源污染治理、生态补偿机制建立等方面提出建议,以协调区域社会经济发展与水源保护。  相似文献   

东海西部沿岸海域冬季的逆温跃层现象及其与环流的关系   总被引：1，自引：0，他引：1  

管秉贤 《海洋科学进展》1999,(2)

本文引用《渤海、黄海、东海海洋图集──水文》分册（１９９２）中有关逆温跃层分布变化的图幅以及温盐历史资料,指出东海西部沿岸（２２～３２°Ｎ）冬季出现逆温跃层的区域北起长江口,南到南澳岛以南几乎相联成片的现象,论述了这一分布与中国东南近海冬季潜伏于深底层的暖流水的区域相吻合,从而从水文结构上证实了冬季在深底层粤东沿岸的南海暖流北上通过台湾海峡西部与闽浙沿岸的台湾暖流相接这一环流特征。  相似文献   

扬子区奥陶纪宝塔组的划分   总被引：7，自引：2，他引：5  

周志强  周志毅 《地层学杂志》1999,23(4):283-286

李四光（１９２４）在长江三峡建立的宝塔石灰岩是一个符合《国际地层指南》原则的组级岩石地层单位,其原始定义应予恢复。那些后来从中肢解出来的牯牛潭组、庙坡组、宝塔组（狭义）、临湘组则应降为次一级的岩石地层单位——段。因为段名与组名不能重复使用,而宝塔一名已被组名所占用,故提出普溪河段代替宝塔段。普溪河段与过去使用的狭义宝塔组定义相同,它的层型剖面在湖北省宜昌县分乡镇北普溪河桥南端  相似文献   

广西主要江河流域的面雨量合成分析与洪涝的关系   总被引：4，自引：0，他引：4  

林开平  孙崇智  陈冰廉  董良淼  郑凤琴 《热带地理》2003,23(3):222-225,245

针对丘陵地区的面雨量计算提出了一种新的方法,利用该方法对广西主要江河流域的面雨量进行计算和合成分析,并研究了流域的面雨量与洪水水位的关系.流域的面雨量与洪水水位关系非常密切,连续性的强面雨量往往对应流域的重大洪涝灾害;面雨量峰值出现时间与洪峰的出现时间之间存在着一定的滞后关系,一般是小流域滞后的时间短,而大流域滞后的时间长.对于大流域来说,滞后的时间长短还与流域致洪暴雨的落区有关.  相似文献