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左江流域水土流失现状与治理措施 总被引:3,自引:0,他引:3
左江流域包括扶绥、崇左、宁明、龙州、凭祥、大新六县市,位于南宁地区的西南部。由于长期以来不合理的开发利用,致使水土流失现象十分严重,不但有面蚀、沟蚀,有些地方甚至发展成崩岗。该区域总面积15092.39Km2,水上流失面积525.81Km2,本文在分析水土流失现状及成因的基础上,提出相应的水土保持措施。 相似文献
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The gravity model: monitoring the formation and development of the Tripolye culture giant-settlements in Ukraine 总被引:1,自引:0,他引:1
The formation, development and decline of the Tripolye culture giant-settlements in Chalcolitic Ukraine are strictly linked to complex processes of migration and settlement relocation. Despite being traceable through pottery typological analyses linked to contextual seriations, their identification is sometime not obvious. This paper shows how the application of the ‘gravity model’ not only facilitates their recognition, but it also helps increase the reliability of determining diachronic and/or synchronic occupations, shedding at the same time light upon the crucial ‘internal’ development of single settlements. Instead of clear-cut consecutive occupations, a more gradual settlement rotation with some synchronous phases seems to have prevailed. 相似文献