基于高分辨率遥感影像的疏勒河流域灌区耕地利用格局评估OA

The Shule River Basin Irrigation District is a typical arid oasis-desert ecosystem and the utilization of cultivated land in this district is of great significance for coordinating regional cultivated land protection,sustainable agricultural development and ecological security.Based on high-resolution remote sensing images from 2017 and 2022,this study analyzed the spatiotemporal evolution characteristics of actually cultivated farmland,abandoned farmland,and saline-alkali farmland in the basin's irrigation districts.The results are as follows:① From 2017 to 2022,the area of actually cultivated farmland in the basin increased by 5 376.48 hm²,with the largest growth in the Huahai Irrigation District of 2 041.21 hm².Among the newly added area,67.37%originated from the improvement of abandoned and saline-alkali farmland.② Abandoned farmland increased by 1 091.45 hm²,with a significant growth of 930.00 hm² in the Shuangta Irrigation District and a decrease of 549.84 hm² in the Danghe Irrigation District.Of the newly added abandoned farmland,67.76%came from the conversion of unused land and cultivated land,and 78.73%of the transferred-out area was reclaimed into cultivated land.Spatially,it presented a"low fragmentation and high aggregation"pattern.Remarkable effects were achieved in the treatment of local patches in Huahai and Qiaozhi Irrigation Districts and the overall direction of centroid migration of abandoned farmland was opposite to that of actually cultivated farmland.③ Saline-alkali farmland decreased by 1 213.59 hm²,with 542.14,169.91 and 224.98 hm² improved in the Shuangta,Danghe,and Huahai Irrigation Districts,respectively,while such farmland in the Changma Irrigation District continued to increase.92.67%of its transferred-out area was converted into actual cultivated land or abandoned land.Saline-alkali farmland in each irrigation district was limited in quantity and relatively concentrated spatially.