近50年来松嫩平原荒漠化时空变化特征
Spatial and Temporal Variation Characteristics of Desertification in Songnen Plain in the Past 50 Years
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摘要: 以1975、2000和2018年的遥感影像为数据源,采用“人机交互式”的目视解译法,提取土地荒漠化信息,结合地理信息空间分析技术,采用动态度计算、转移矩阵分析、景观格局分析等方法,分析松嫩平原近50年来的土地荒漠化时空变化特征和演变规律。研究结果表明,1975—2000年,松嫩平原荒漠化土地总面积明显呈发展趋势,总面积增加了7 061.60 km2,主要分布在松嫩平原东南部;2000—2018年,松嫩平原荒漠化总面积减少,减少面积为10 387.46 km2,土地荒漠化趋势得到改善。Abstract: With the remote sensing image of 1975,2000 and 2018 as data source,the Songnen Plain nearly 50 years of spatial and temporal variation characteristics of land desertification and evolution were analyzed,using the man-machine interactive visual interpretation method to extract desertification information,combining with geographic information system(GIS)spatial analysis technology,dynamic calculation,transfer matrix analysis and landscape pattern analysis.Results showed that from 1975 to 2000,the total area of desertification land in Songnen Plain illustrated an obvious development trend,while the total area increased by 7 061.60 km2,and it was mainly distributed in the southeast of Songnen Plain;from 2000 to 2018,the total area of desertification in Songnen Plain decreased by 10 387.46 km2,and the desertification trend has been improved.
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Keywords:
- Songnen Plain /
- land desertification /
- transfer matrix /
- landscape pattern
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