【摘要】 岷江上游地区位于青藏高原向四川盆地的过渡地段,其源头到都江堰市,包括汶川县、茂县、理县、黑水县和松潘县五个县。它是四川省乃至全国的一个重要的林区。在过去的几十年里,其景观结构发生了重要的变化。本文应用3S 技术研究了该区在1986 年到2000 年之间的景观变化情况。该区的景观被划分为10 个景观生态类型,即耕地、有林地、灌木林地、经济林、草地、居民用地、河流、湖泊、沼泽和未利用地。研究结果表明,在岷江上游地区林地和草地是该区主要的景观类型,约占全区面积的91%,景观类型之间的变化主要发生在有林地、灌木林地、草地、耕地、居民用地和经济林之间,并且有林地面积从51.17%下降到47.56%。分析结果表明,岷江上游地区在过去的几十年里其景观的破碎化在加剧。图1表2 参20。更多还原

【Abstract】 The upper valley of Min River (102° 59′ –104° 14′ E, 31° 26′ – 33° 16′ N), which is consisted of the counties Wenchuan, Maoxian, Lixian, Heishui, and Songpan, refers to the part up to Dujiangyan City, and locates on the transition zone from the Tibetan Plateau to the Si- chuan Basin. It is one of the most important forest areas in China, especially in Sichuan Province. Over past two decades, the landscape changed remarkably in the region. The 3S techniques (Remote Sensing (RS), Geographic Information System (GIS) and Global Position System (GPS)) were used to classify the images and analyze the landscape change. The remotely sensed data of Landsat TM 1986 and Landsat ETM+ 2000 were used to analyze the landscape change of the region. The landscape were classified into 10 types of cropland, for- est, shrub land, economic forest, grassland, build up land, river, lake, swamp, and unused land. The results showed that: 1) the woodland and grassland were dominating landscape types in the upper valley of Min River, which is more than 91% of the study area; 2) the alteration of the landscape was mainly happened among forest, shrub land, grassland, economic forest, cropland, and build up land, where forest de- creased from 51.17% to 47.56%; 3) the landscape fragmentation in the upper valley of Min River was aggravated from 1986 to 2000.更多还原