基于GIS的典型农牧交错区土地利用生态安全评价

以内蒙古自治区翁牛特旗为对象,基于GIS技术对典型农牧交错区进行了土地利用生态安全评价.结果表明:研究区1985-2000年有50%以上的总土地面积受到沙化和土壤侵蚀的危害,中西部地区的土壤侵蚀和东部地区的土地沙化依然严重;研究区1985年和2000年平均生态安全指数分别为2.70和2.66,整体生态安全状况处在不安全等级;1985年和2000年各生态安全等级分布面积由大到小排序依次为欠安全＞极不安全＞较安全＞不安全＞安全.

GIS-based land-use eco-security evaluation in typical agro-pastoral zone

Taking Ongniud Banner in Inner Mongolia as a representative of typical agro-pastoral zone in North China,GIS-based land-use eco-security evaluation was conducted.The results showed that in 1985-2000;over half of the study area was in danger of desertification and soil erosion.The soil erosion in the central and west regions and the land desertification in the eastern region were still serious,and the average eco-security synthetic index(ESSI) in this area was 2.70 in 1985 and 2.66 in 2000,with the overall eco-security status being in insecurity.The distribution area of various eco-security grades in 1985 and 2000 was in the order of less secure > extremely insecure > relatively secure > insecure > secure.