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伊朗锡斯坦地区沙漠灾害区划(英文) 总被引：1，自引：1，他引：0
Desertification process as a great problem affects most of the countries in the world.This process has a high rate in arid and semiarid areas.Today,human societies are encountering the desertification phenomenon as a serious problem which causes various irreparable damages to economic and social sectors.In order to assess desertification results in production of different regional models for their application in another region the indices should be re-investigated and adjusted to local conditions.Several models have been developed for desertification evaluation.The present study,attempts to assess quantitatively the desertification process has in an area located at Sistan plain of Iran(Niatak region as a case study) by using Modified MEDALUS method.The obtained results indicated that of the whole studied region(comprising 4819.6 acres),2651.56 acres(55%) are located in medium desertification intensity class,1269.48 acres(26.34%) are positioned in severe desertification intensity class,and 898.54 acres(18.64%) are placed in vary severe desertification intensity class. 相似文献
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土地荒漠化是疏勒河流域面临的关键环境问题,加强该区域的荒漠化敏感性评估对有效控制荒漠化至关重要。通过集成多源GIS与遥感数据,构建土壤、植被、气候和管理定量评估指标,利用地中海荒漠化与土地利用模型（MEDALUS）计算环境敏感性指数,识别荒漠化敏感区,在此基础上分析荒漠化敏感性的成因,并引入变异系数法确定荒漠化敏感性的主要影响因素。结果表明：目前疏勒河中下游荒漠化态势严峻,17.70%的区域属于极高敏感区,54.34%属于较高敏感区。荒漠化敏感性的空间格局是中部高、北部低,主要由与人类活动有关的管理质量指数决定。从绿洲内至绿洲外荒漠化敏感性逐渐升高,大致呈层状分布,表明人类活动对荒漠化影响显著,建议加强和巩固绿洲外围的防护体系建设。 相似文献
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