Analyzing Dynamic Process of Land Use Change in Songnen Plain of China: A Case Study in Duerbote Mongolian Autonomous County of Daqing City
松嫩平原土地利用/覆被变化的动态过程分析——以大庆市杜尔伯特蒙古族自治县为例

Today,many environmental problems facing people are related to land use/land cover change.It is very important to hold a general and objective viewpoint to the detailed dynamic process of land use/land cover change.In this paper,Duerbote Mongolian Autonomous County in Daqing City was selected as a case study area,five periods of land use data from 1954 to 2001 is used to study the land use change process during the past 50 years by recording every patch of land use type based on remote sensing and GIS technology.The patches of land use change in a certain period were classified into three types of land use conversion,namely,unchanged type,human disturbance type,and natural evolution type.The stability of land use tendency in the process of land use conversion was also analyzed.The results are as follows: 1) Different land use type has different stability of land use conversion.Water area,urban areas,residential areas and cultivated land are the most stable one;degenerated saline-alkali land and other hardly used land are in the second place;wetland,woodland and grassland are most unstable one.This indicates that once the land is reclaimed and used as cultivated land,they will not be abandoned in a long period.Water area and wetland couldn't easily be changed for other purpose;yet degraded saline-alkali land was with a little change because of its difficult improvement.Wetland and grassland had a good degree of transformation because of their unstable state where the conversion between grassland,wetland,water areas and saline-alkali land was mainly affected by precipitation;2) the stability of land use tendency also varies from different land use change types.If the conversion is from unchanged type or natural evolution type to human disturbance type,then,the patch of land use type tends stable,and there is only a remote possibility of land use change in the next period;on the contrary,if the conversion of land use change is from unchanged type or human disturbance type to natural evolution type,the patch of land use type tends unstable in the next period,which indicate land use conversion tends to be the type of maximizing its value of productivity.This method that distinguished the influence of people's behaviors on land use and natural change is helpful for showing the laws of regional land use/cover change.