共查询到20条相似文献，搜索用时 399 毫秒
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Brazil seeks to rapidly increase its agricultural production to meet future demands, especially for sugarcane, which is an agricultural commodity and a biofuel source. In this paper, we explore how to achieve this increase without compromising existing forestlands. We propose that it is possible to substantially expand sugarcane production in Brazil while avoiding further environmental losses and the indirect land use changes often associated with them, such as deforestation. This task could be accomplished by converting existing pasturelands with agricultural potential into cropland. A great deal of pastureland exists in Brazil. Thus, we addressed the following questions in this study: (1) where are the most suitable pasturelands for sugarcane located geographically and (2) what potential do these pasturelands have for sugarcane production regarding their physical suitability and other significant factors, such as infrastructure availability and socioeconomic factors. We conducted a land suitability analysis using a spatial location model based on multicriteria decision-making and geographic information systems (GIS) to identify the cultivated pasturelands most suitable for conversion to sugarcane production in Brazil. “What if” scenarios were built to determine how changes in the subjectively derived weights of the priority criteria would modify the spatial distribution of the suitability classes relative to the MCDA model and demonstrate the robustness of the crop suitability assessment. The most suitable pastureland areas for conversion to sugarcane production were predominantly located in Minas Gerais, São Paulo, Paraná, Goiás, Mato Grosso do Sul, Mato Grosso and Pará. These zones have large contiguous areas of pasture with moderate and high agricultural potentials for sugarcane production. The total estimated area of cultivated pasturelands with moderate or high suitability for sugarcane production was 50 million hectares, which is much larger than the area currently used for sugarcane production in Brazil. 相似文献
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《The Journal of geography》2012,111(4):143-155
This article examines possibilities associated with the cultivation of balanced regional images via the use of simple methods. Two experiments based on the primacy effect and the painting picture rule, or visual depiction of regions, were conducted. The results show significant differences in the formation of regional images. More specifically, the presentation of positive prior knowledge and the depiction of regional aspects with strong visual cues led to the formation of regional images that were more balanced. In conclusion, these simple teaching methods are effective for cultivating balanced regional images, an important element of geography education. 相似文献
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国外区域发展规划的全新审视及对中国的借鉴* 总被引：21，自引：3，他引：18
从100年来国外区域发展规划总体演变历程入手,提出了国家“高度指令+强制干预”体制下、“统一领导+总体协调”体制下和“不统不控+政策当先”体制下区域发展规划的三大生成模式,认为国家政治经济体制的变革主宰着规划的命运,作为特定时期政府一项重要职能的规划的局限性在所难免。中国在区域发展规划中必须重视计划与市场的适度结合,公众参与与政治参与的有机协调,建立健全规划中的立法管理体系,并注重对生态环境和可持续发展问题的研究。 相似文献
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Reidar Løvlie 《Geophysical Journal International》1982,70(2):543-544
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数字拓扑研究现状及其在GIS中的应用 总被引：1，自引：0，他引：1
数字拓扑主要研究栅格空间中离散几何对象的拓扑性质,这些性质在GIS空间分析和栅格数据处理中非常重要。该文从图论、混合拓扑和公理型3方面对数字拓扑的研究现状进行了分类和综述,并讨论数字拓扑在GIS领域的应用,指出三维数字拓扑和球面数字拓扑是数字拓扑在GIS中的两个发展趋势和研究热点。 相似文献
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党的十六大报告中明确提出“支持东北地区等老工业基地加快调整和改造,支持以资源开采为主的城市和地区发展接续产业”,“国家要加大对粮食主产区的扶持”等的重大决策,为东北老工业基地的振兴提供了难得的机遇;报告中提出的“走新型工业化道路”,为东北地区完成上述历史任务指明了方向。 相似文献
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《The Journal of geography》2012,111(4):176-178
Abstract Hilltop Geography is a year-long integrated geography program that involves first and second graders in a hands-on laboratory approach to exploring their immediate environment while at the same time providing a stepping stone to their understanding of the world. This article will describe how teachers and students in a rural New Mexico school have been utilizing the semi-arid hills surrounding their building as an outdoor geography learning laboratory, involving parents and the local community in the process. 相似文献
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