基于地貌类型单元的京津冀近10a土地覆被变化研究

基于资源与环境信息系统国家重点实验室提供的2000、2005、2010年京津冀土地覆被数据和1:100万数字地貌数据,研究2000—2010年间京津冀不同地貌类型单元下土地覆被的时空分异特征,挖掘土地覆被变化主导程度、叠合度、动态度在不同地貌类型单元下的变化规律,进一步探讨不同地貌类型单元下的土地覆被变化。结果表明:京津冀以耕地转变为城镇用地为主,平原、台地和丘陵城镇扩张加剧,耕地缩减明显;不同地貌类型单元的土地覆被总体变化差异较大,平原、丘陵和小起伏山地的变化较剧烈;林地和草地初期不断扩张,以平原、大起伏山地和丘陵最为典型,后期变化不明显。最后讨论了基于地貌类型单元研究京津冀地区土地覆被变化的意义,并提出探究地貌与土地覆被变化内在联系的建议。

Research on Land Cover Change in Beijing-Tianjin-Hebei Region during the Last 10 Years Based on Different Geomorphic Units

Provided by State Key Laboratory of Resource and Environmental Information System, which belonged to the Institute of Geographic Science and Natural Resources Research, CAS, land cover data of Beijing-Tianjin-Hebei region in the year of 2000, 2005 and 2010 and 1:1 million digital topography data were used to have a research on land cover change of Beijing-Tianjin-Hebei region in recent 10 years based on different geomorphic units. Variations about the values of leading level, coverage degree and dynamic degree based on different geomorphic units were computed, which would help to have a further discussion about the spatio-temporal differentiation of land cover based on different geomorphic units. The results showed that the major changes of land cover in Beijing-Tianjin-Hebei region in the last ten years were the changes from arable land to the built-up and residential areas, which were dramatic in the geomorphic units of plains, hills and small undulating mountains, while arable land continued shrinking, especially in the geomorphic units of plains, terraces and hills. On the whole, differences about changes of land cover based on different geomorphic units in Beijing-Tianjin-Hebei region in recent 10 years were obvious. To be specific, land cover changes in the geomorphic units of plains, hills and small undulating mountains were dramatic. In the first five years from the year of 2000 to 2010, woodland and meadow had an obvious expansion, especially in the geomorphic units of plains, large undulating mountains and hills, while the expansion of woodland and meadow in the last 5 years from the year of 2000 to 2010 was not obvious. At last the significance of the research of land cover changes in Beijing-Tianjin-Hebei region based on different geomorphic units were discussed, which proved that the research was meaningful, what's more, some recommendations about the research on inherent relationship between geomorphic units and land cover changes were made, which paid more attention to the secondary classification system of both geomorphic units and land cover.