土地转移流视角下土地利用变化过程追踪方法探讨——以宁夏中部干旱带盐池县为例

Study on tracing method of land use change process based on the perspective of land use transfer flow——A case study in Yanchi County in arid area of central Ningxia Hui Aotonomous Region

基于土地转移流视角,提出土地转移率和土地转移链概念,采用Landsat MSS/TM/ETM遥感影像数据源,对宁夏中部干旱带盐池县的土地变化过程进行追踪分析.结果表明,1978—2015年盐池县土地利用变化总体表现为耕地和草地比例增大,未利用地减少.区县尺度上,土地转移率先增后减.类型上,耕地转移率为降—升—降态势,草地转移率持续降低,未利用地转移率呈升—降—平稳态势.1978—1987年,以未利用地—耕地流、草地—耕地流为主;1987—1996年,土地利用转移流呈现多元化特征;1996年后加强了生态退耕和对未利用地的改造利用.1978—2015年,土地转移链围绕着耕地的流失与保护进行,单向链主要是63型(未利用地—草地型);往复链以Ⅱa型为主,为363型(草地—未利用地—草地型)、313型(草地—耕地—草地型)和131型(耕地—草地—耕地型);复杂链主要是163型(耕地—未利用地—草地型).

Based on the perspective of land use transfer flow , this paper put forwarded the concepts of land use transfer rate and the land use transfer chain , using data sources of Landsat MSS /TM/ETM remote sensing image , and made a comparative study of land change process in Yanchi County in Arid area of central Ningxia Hui Aotonomous Region . The results showed that the area of cultivated land and grassland have increased in the county , however , the area of unused land has reduced during 1978—2015 . At county scales , land use transfer rate rised up and then declined in Yanchi County . At type scale , cultivated land transfer rate was with a feature of fall-rise-fall , grass transfer rates continue to reduce , and unused land with a feature of rise-fall-steady pattern .It is given priority to flows such as unused land to cultivated land flow and grass land to cultivated flow from 1978 to 1987 . The land use transfer flow present diversified from 1987 to 1996 . In Yanchi County , it is given priority to with ecological construction , one-way chain is mainly the type 63 （unused-grass ） , give priority to with Ⅱ type a reciprocating chain ,for the type 363（grass-unused-grass） , the type 313（grass-land-grass）and type 131 （cultivated-grass-land） , a complex chain is mainly the type 163（arable-unused-grass） .