黄土高原撂荒耕地时空变化和驱动因素分析OA

The Loess Plateau,as an important ecological barrier and agricultural production area in China,faces the issue of cropland abandonment,which has profound impacts on regional ecological environments and food security.Revealing the spatiotempo-ral pattern and driving mechanism of abandoned croplands provides a scientific basis for the formulation of cropland protection and ecological restoration policies on the Loess Plateau.Based on sliding window analysis and pixel-by-pixel correlation analysis,this study systematically revealed the spatiotemporal characteristics and driving mechanisms of abandoned cropland from 1992 to 2019 on the Loess Plateau using China Land Cover Data(CLCD),nighttime light data(SVNL),topographic data,and climatic data.Results indi-cated that from 1992 to 2019,the total area of abandoned croplands on the Loess Plateau was 107.46×105 hectares.Among this,the av-erage area of abandoned croplands was the highest during the comprehensive implementation phase of the Grain for Green Program(2001 to 2006).Abandoned croplands were mainly distributed in high-altitude(1500 to 1750 meters)and steep-slope(70°to 75°)ar-eas,indicating significant constraints imposed by natural conditions on cropland utilization.The area of abandoned croplands varied significantly along temperature and precipitation gradients,with the highest abandonment rates observed in the-4 to 1℃ low-temper-ature range and the 400 to 500 mm precipitation range.Correlation analysis between nighttime light intensity and abandoned cropland showed that in most regions of the Loess Plateau(60.26％),the correlation coefficients ranged between-0.200 0 to 0,indicating a weak correlation between nighttime light intensity and abandoned farmland.However,provincial-scale analysis revealed significant negative correlations in Shanxi and Inner Mongolia,while significant positive correlations were observed in Shaanxi and Ningxia,re-flecting differences in regional economic development models and land use structures.