福建省耕地占补时空分异及其对生态系统服务价值的影响研究OA北大核心CSTPCD

Exploring the spatiotemporal differentiation characteristics of the cultivated land requisition-compensation balance and its impact on ecosystem service value(ESV)is essential for understanding land-use change trends,ensuring food security,and promoting ecological civilization.Based on remote sensing interpretation data of land use from 2000,2005,2010,2015,and 2020,spatial and digital terrain analysis methods were employed to reveal the spatiotemporal differentiation characteristics of cultivated land requisition compensation in the Fujian Province.Additionally,ESV was evaluated using modified ESV coefficients.Finally,hotspot analysis methods were used to further elucidate the impact of cultivated land requisition compensation on the ESV.The results showed that 1)from 2000 to 2020,there was a significant decrease in cultivated land area in Fujian,with a net change rate of-22.3%,indicating an imbalance in the amount of cultivated land requisitioned and compensated.Requisition occurred mainly for forest and construction land,whereas compensation predominantly involved forestland.The spatial distribution of cultivated land occupation and compensation was uneven,with the requisition concentrated in the southeastern coastal regions and compensation concentrated mainly in the central and northwestern areas.2)Over 20 years,the average slope and elevation of the requisitioned cultivated land were lower than those of compensated land.The slope distribution advantage zones for cultivated land requisition and compensation were within the 0-11° and 0-13° ranges,respectively,whereas the elevation distribution advantage zones were within the 0-320 m and 0-340 m ranges.Additionally,there was a shift towards lower slope/elevation areas for requisitioned land and higher slope/elevation areas for compensated land.These findings indicate that Fujian's cultivated land resources exhibit an"gentle requisition,steep compensation"and"low requisition,high compensation"phenomenon.3)Over the 20 years,the overall ESV of Fujian Province showed a continuous decline,with a decrease of 1.56 billion yuan attributed to the requisition-compensation process,primarily due to the conversion of forest land,water bodies,and requisitioned land for construction.Notably,in 2015‒2020,the reduction in ESV due to cultivated land requirements and compensation peaked,accounting for 49.3%of the total change.The ESV changes from 2000 to 2020 exhibited significant clustering,with hotspots in the southern part of Zhangzhou and cold spots in the coastal areas of Xiamen and Quanzhou.These results can provide a scientific basis for improving requisition compensation policies and advancing the ecological civilization in Fujian Province.