关键词: 土地利用类型转移, 生态服务价值, 格网尺度, 空间探索性分析, 延安市, 退耕还林

Abstract:

Under the background of Sloping Land Conversion Program (SLCP), this study explores the temporal variation characteristics and the correlation and heterogeneity of spatial transfer of the ecological service value (ESV) for different land use types of Yan'an, a city with remarkable ecological improvement after the SCLP. To achieve this goal, the ESV of different land use types at a grid scale of 2 km × 2 km is calculated using land use transfer matrix achieved from the interpreted image data of three periods and exploratory spatial data analysis (ESDA). The results show that: (1) From 1990-2015, the increase (decrease) of ESV mainly occurred between arable lands, forests and grasslands, and the total ESV increased from forests and grassland was 2.129 billion yuan, the amount of transfer-in mainly occurred after the implementation of the SLCP; (2) The ecological service function was mainly provided by forestland and grassland, the ESV experienced a process of descending and then increasing from the temporal perspective, and the implementation of SLCP promoted the growth of ESV with an increase of 5.34% during 2001-2015; (3) The ESDA shows that, the ESV has a significant distribution of "high in the south, while low in the north" pattern at the grid scale which expresses positively spatial agglomeration and dependence, and it is obvious that the high-high aggregation area accorded with the spatial distribution of forestland and grassland whereas the low-low aggregation area accorded with that of farmland and construction land. Overall, the transfer of land use types and the changes of ESV in Yan'an city coincided with the implementation of SLCP temporally and spatially, which indicates that the SLCP, a government-dominated project, had a significantly positive effect on the restoration and protection of ecological environment. Therefore, with regard to the ecological service function of different land use types, the northern part of the study area with a large amount of cultivated land should pay attention to the balance between agricultural production and ecological benefits based on the basic farmland protection system, while the southern part with abundant forestland and grassland should continue to play a critical role in the regulation function of ecological barrier.

Key words: grid scale, exploratory spatial data analysis (ESDA), Yan'an city, Sloping Land Conversion Program (SLCP), land use type transfer, ecological service value (ESV), grid scale, exploratory spatial data analysis (ESDA), Yan'an city, Sloping Land Conversion Program (SLCP)