大地热流对中国西部环境与生态演变的影响及其研究意义   总被引：4，自引：0，他引：4  

匡耀求  黄宁生  吴志峰  胡振宇  孙波  刘承帅 《地球科学进展》2003,18(1):22-029

中国西部地区生态环境的优劣与大地热流的高低有良好的对应关系。大地热流较高的西南地区生态环境优良,孕育了我国最好的生物多样性;而大地热流较低的西北地区环境恶劣,生态脆弱,荒漠化严重。大地热流的脉动影响区域大气系统下垫面的热力背景和气流运动,从而影响降水的分布和区域气候的干湿程度;大地热流的高低决定了一个地区地表生态系统能量供给的下限,是生态系统演变过程中一个重要的物种限制因子,制约了一些地区生态系统物种的多样性,进而影响到区域生态系统的稳健性。对大地热流影响生态系统发育和演变机理的研究将为人类科学干预地表生态系统的演化、恢复与重建退化生态系统提供科学依据与技术方案。提出了西部生态环境整治的一些新的思路。  相似文献   

云南地热资源及其开发前景   总被引：1，自引：0，他引：1  

殷瑛  王明珠  何绕生 《云南地质》2006,25(1):70-75

云南地热异常多且显著。滇西高温水热活动区是藏滇水热带的南延，滇东断陷盆地中低温水热活动区的形成得益于独特的地质结构，滇西、滇南花岗岩地热系统则主要吸收地层中K^40同位索放射热而成。开发前景极为广阔。  相似文献   

Conservation and community in the new South Africa: A case study of the Mahushe Shongwe Game Reserve   总被引：1，自引：0，他引：1  

Brian H. King 《Geoforum》2007,38(1):207-219

The idealization of natural landscapes and peoples during colonialism, coupled with the popularity of sustainable development in the postcolonial era, has contributed to the expansion of conservation planning throughout the African continent. Concerns surrounding the promotion of national and international conservation agendas at the expense of local livelihood needs have generated interest in community conservation projects that attempt to include local participation and knowledge in natural resource management. The early excitement associated with community conservation has waned in light of recent assessments that it has been unsuccessful in meeting its ecological and social goals. This parallels other research that suggests communities are understood in generic or homogenous ways that influence how these initiatives are understood. Using a case study of the Mahushe Shongwe Game Reserve, this paper evaluates how rural households access environmental and economic resources to produce livelihoods, and how these access patterns impact their views of the project. It is argued that there are significant livelihood variations within the community that shape the ways households engage with, and benefit from, conservation planning. Rather than strictly viewing Mahushe Shongwe as a constraint to environmental resource access or site for limited employment, community members identify a number of benefits from its existence including education and development opportunities. Additionally, transformations in governance systems in the region impact community views of the project since younger residents are less likely to engage with the Matsamo Tribal Authority, which participates in managing the reserve. The consequence is that conservation has various impacts and meanings within a specific community that remain tied to the livelihood and governance systems being renegotiated in the post-apartheid era.  相似文献   

The contested spaces of Cuban development: Post-socialism, post-colonialism and the geography of transition   总被引：1，自引：0，他引：1  

Simon Reid-Henry 《Geoforum》2007,38(3):445-455

The experience of the (post)socialist South has been marginal to the study of transition, despite the many similarities between processes of transition and development. This paper tries to better understand this overlap by exploring some empirical and conceptual connections between processes of development and processes of transition in Cuba. In doing so it makes two sets of arguments. The first set of arguments concerns the nature of ‘transition’ itself. I use the ‘contested spaces’ of the Cuban (socialist) biotech sector, and specifically its attempts to attract foreign (capitalist) investment as a case study. As a high profile industry, biotechnology functioned in Cuba as a political space within which questions of transition and development could be reconfigured by blurring the boundaries between them. In turn, this has enabled the Cuban State to legitimise responses to transition that would otherwise have appeared contradictory. The second set of arguments try to explain how this was possible. I argue that the slippage between nationalist and socialist visions of development allowed biotechnology (as a specifically developmentalist project) to be variously understood as, for example, a post-colonial socialist, or anti-colonial nationalist project in ways that suited the needs of transition at any one time. Such recombinations in many ways account for the non-linear and reversible nature of transition in Cuba. I speculate as to whether Bruno Latour’s work on the way capitalist societies understand themselves to be ‘modern’, helps explain how, in (post)socialist countries, processees of transition can be shaped through different historical constructions of modernisation and development.  相似文献   

北方落叶果树嫁接适宜气象条件调查与研究     

赵变茂  贺延梅  李化龙 《陕西气象》2007,(4):30-31

本文介绍了山西省气象局气象科技数字图书馆的构架及服务功能，从数字图书馆技术方面分析了气象科技图书馆的主要特点，同时对数字图书馆开通以来的使用情况进行了统计分析，为数字图书馆的进一步完善和发展提出构想。  相似文献   

近年来我国文化地理学研究的进展   总被引：7，自引：0，他引：7  

刘沛林 《地理科学进展》1998,17(2):92-98

作为人文地理学重要分支之一的文化地理学,在我国出现晚但发展快。纵观十余年来的发展情况,可大致概括为：（１）文化地理学理论从引进到消化进而有了较大的发展,（２）区域文化地理的研究从宏观走向微观,（３）历史文化地理的研究从断代走向区域,（４）专题性文化地理的研究从单一走向多元,（５）综合性文化地理的研究从核心扩展到边缘。其总趋势是逐渐走向具体化、区域化、综合化。  相似文献   

镁资源研究与开发述评之一──镁水泥的研究与盐湖的开发   总被引：1，自引：0，他引：1  

王臣松 《盐湖研究》1998,(Z1)

简单概括了镁资源研究开发的状况,评述镁水泥研究的主要理论成果。指出以镁水泥为途径开发盐湖资源的重要性。同时表述了镁水泥研究领域的最新动态,指出当前镁水泥研究需要考虑的几个重大问题。  相似文献   

从对立统一观论人—地关系动力学     

徐公愉 《吉林地质》1998,17(1):43-47

人－地关系动力学将成为新工纪的地球科学的前沿学科。环境与发展已成为今日国际社会的共识。从对立统一观分析,人－地关系动力学具有整体性与局部性、缓变性与突发性、可再生性与不可再生性、因果性、不可逆性与避防性、线性变化与指数变化等特性。人类社会经济发展与资源、生态环境之间相互制约,要在现代科学技术的有效支持下,保持、发扬优化条件,减少、防止恶化条件,使人类社会经济保持健康的持续发展。  相似文献   

1997年广东台山小震群特征     

康英  王正尚  何景琳  黄文辉  单和秋 《湖南地质》1998,(4)

分析了１９９７年１１～１２月在广东台山市三合镇附近发生的最大震级为４１级小震群的活动特征、地质构造背景和震源机制解,并将其与１９７０年７～１２月发生的最大震级为４０级的台山震群进行了对比,计算了两次小震群的序列特征参数,结果表明,１９９７年震群具有前兆震群的某些特征。  相似文献   

基于气候适宜度的夏玉米发育期模拟模型   总被引：3，自引：0，他引：3  

王展  刘荣花  薛明  李树岩 《气象科学》2015,35(1):77-82

结合前人气候适宜度的研究成果,以作物生理生态发育过程为基础,构建了夏玉米发育期预报模型。模型中分别建立了夏玉米温度、降水、日照时数适宜度函数,并结合河南省19个农业气象试验站的夏玉米发育期资料,运用通径分析法确定各个生育期温度、降水和日照的影响权重系数,计算出综合适宜度,用来预测夏玉米生育期。结果表明,模型能够较好地预测各个发育期(出苗、七叶、拔节、抽雄、乳熟和成熟)。建模资料的模拟值与观测值比较的均方根误差分别为1.5、3.1、3.4、2.9、4.0、4.5 d。运用独立资料对模型所作预测值的均方根误差在1.0~4.6 d之间。  相似文献