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首页> 外文期刊>The International Journal of Sustainable Development and World Ecology >Land-use dynamics of an alpine-cold desertified area in the Qinhai-Tibetan Plateau in the last 30 years: a case study in Guinan County, Qinghai Province, China
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Land-use dynamics of an alpine-cold desertified area in the Qinhai-Tibetan Plateau in the last 30 years: a case study in Guinan County, Qinghai Province, China

机译：近30年来青藏高原高寒荒漠区土地利用动态-以青海省桂南县为例。

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摘要

In this study, the land-use change characteristics in the past 30 years of an alpine-cold desertified area in the Qinhai-Tibetan Plateau were assessed by interpreting remote sensing satellite imagery during three key periods (1976, 1996, 2006) as well as by applying a geographical information system (GIS). The assessed results were summarized from three positions. First, grassland was the basic landscape background of study region, while, at the same time, many desert landscape elements (such as sandy land and drying ravines) were distributed among grasslands. Second, the disturbance derived from humans to the landscape was not intensive in the 1970s, but after 1996, such disturbance was greatly increased. Significant differences in dominance index were found among different patch types, and landscape fragmentation degree and simple landscape diversification were low in 1976. After 1996, there was an obvious change in the pattern of patches and the landscape became more fragmented. Third, in the last 30 years, transformation speeds among different lands-use types accelerated. During 1976-1996, great changes in land-use area occurred, but the speed of change was slow. During 1996-2006, the land-use area change was less than that for 1976-1996, but the speed of change was rapid. The main driving force contributing to the dynamic changes of land use was human activities.
机译：在这项研究中，通过解释三个关键时期（1976年，1996年，2006年）以及遥感卫星图像，评估了青藏高原高寒沙漠化地区过去30年的土地利用变化特征。通过应用地理信息系统（GIS）。评估结果从三个方面进行了总结。首先，草原是研究区域的基本景观背景，而与此同时，许多沙漠景观元素（如沙地和干燥的沟壑）分布在草原之间。其次，在1970年代，人类对景观的干扰并不强烈，但是在1996年之后，这种干扰大大增加了。 1976年，不同斑块类型的优势指数存在显着差异，景观破碎化程度和简单景观多样化程度较低。1996年后，斑块格局发生了明显变化，景观更加破碎化。第三，在过去的30年中，不同土地利用类型之间的转化速度加快了。 1976-1996年期间，土地利用面积发生了很大变化，但变化速度很慢。在1996-2006年期间，土地利用面积的变化小于1976-1996年，但变化速度很快。促进土地利用动态变化的主要动力是人类活动。

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