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文章简述了李连捷先生为中国的土壤科学和为生产服务而奋斗的一生。20世纪40年代,他在去美国深造之前,就在国内到贵州、广西和华南的许多省区进行了大面积的土壤调查工作。新中国成立后,他欣然接受先后到黑龙江、青海和内蒙古等省区进行荒地资源垦殖的调查任务,并于50~60年代,先后参与和组织了对西藏、新疆等地多专业的大型综合考察。通过这些考察,为西部大开发摸清和积累了大批可贵的自然资源资料,为我国土壤的发生和分类、土地资源的合理利用以及国民经济的发展做出了积极贡献。李先生在他近半个世纪的教学工作中,为我国培养了大批土壤科学人才。他一生刚正不阿、高风亮节,为我们树立了学习的榜样。在李连捷先生逝世10周年之际,仅以此文表达对他的深切怀念。 相似文献
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清代移民屯田对新疆地名的影响 总被引:1,自引:1,他引:1
本文从移民地名、屯田地名、方位地名、方言地名等方面,论述了清代移民屯田对新疆的地名的影响。 相似文献
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IntroductionStability of municipal solid waste (MSW) was not a major concern early because waste instability was considered as an operational problem that can be remedied by replacing the waste in its original position. However, with the introduction of liners and leachate collection and removal systems (LCRS), the integrity of the liner and LCRS may be concerned. Instability or displacement of a wasteland may result in failure of above system and contamination of groundwater or surface wa… 相似文献
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中国西北干旱地区城市化过程及空间分异规律 总被引:4,自引:0,他引:4
通过对实地调研和大量文献分析,对我国西北干旱地区城市发展与自然环境的关系进行论述,认为城市化过程本质上就是人地关系的集中凸现,是自然要素与人文要素长期互相作用的结果。自古以来,城市就是人类聚居的主要场所,屯垦是西北干旱地区最能体现人地关系的耦合点。在西北干旱地区现代城市化过程中,屯垦和矿产资源开发有较大的带动作用。由于自然因素和社会因素的双重影响,人口分布和聚居程度极不均衡,社会经济分异较大,城镇功能单一,部分地区和城镇的人口城镇化水平较高,并不是社会经济整体发展的结果,而是资源开采、行政建制的设立、极端自然条件下生存的需要等多种因素形成的。城市分布空间格局以带状、团状、串珠状为主,有着不同于其他地区的演化模式,城镇发展表现出多元复合的特征,是政治、经济、生态环境、资源、民族与文化等诸多因素相互关联、起伏变化的结果。城镇高速发展、城市化速度加快是未来西北干旱地区社会经济发展的必然结果,面对脆弱的生态环境和有限的资源,提出在西北干旱地区建设只有城镇、没有村落的新型城市社会,以达到社会经济和生态环境可持续发展的目标。 相似文献
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Erik Harms 《Singapore journal of tropical geography》2014,35(3):312-327
Lands cleared for Vietnamese New Urban Zones are commonly described as ‘wastelands’ (??t hoang) in need of development. But clearing these lands in Vietnam's densely populated urban areas requires evicting large numbers of urban residents. How is it possible to render populated spaces as empty wastelands? This paper juxtaposes new ethnographic research in Ho Chi Minh City against historical scholarship on Vietnamese concepts of ‘clearing the wasteland’ and colonial civilizing projects of mise en valeur. In doing so, the article describes these concepts as parallel legitimizing strategies that effectively enable developers and planners to render previously occupied and utilized lands as empty, uninhabited wastelands. The article shows that the same narrative structure used in these earlier contexts is used to justify current urban development projects. 相似文献
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Carbon Dioxide Fluxes and Potential Mitigation in Agriculture and Forestry of Tropical and Subtropical China 总被引:5,自引:0,他引:5
Tropical and subtropical areas comprise about 23% of the total land area (960 Mha) of China. Of this, about 40% is in forests, 20% is in cropland and another 20% is wasteland. Preliminary estimates of overall sources and sinks of carbon dioxide indicate that current agricultural activities probably constitute a net sink. We estimate that improved agricultural management and wasteland reclamation have the potential to sequester an additional 1.9 Tg CO2-C y-1 or more, largely through increasing productivity and C inputs to soils and conversion of wasteland to agricultural production. We estimate that current forestry activities in the region could sequester about 7 Tg CO2-C y-1. There is also a large potential for increased C sequestration and fossil fuel offsets by conversion of wasteland to fuel wood plantations, on the order of 30-70 Tg C y-1. A number of practices for increasing mitigation of CO2 emissions in the forestry and agricultural sectors are presented. 相似文献
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