北盘江流域耕地景观格局时空演变

Temporal and spatial evolution of landscape patterns of cropland in Beipanjiang River Basin

揭示中国西南岩溶山区典型流域耕地利用景观格局演变过程与趋势,对其粮食安全、可持续发展、乡村振兴具有重要意义。本文基于多期高分辨率遥感数据,运用景观格局指数、热点分析等方法,从耕地利用规模和耕地利用形态视角深入研究北盘江流域景观格局时空演变规律。结果表明:2010—2020年流域耕地面积呈降低趋势,共减少1 855.77 km2,破碎化程度增加,聚集度降低。空间上西北部耕地呈大规模、形态复杂化聚集分布,东南部呈小规模、规则化聚集分布。流域耕地主要转移为林地、园地和建设用地,其规模越小、复杂度越高,越容易发生转移。

It is important to reveal the evolution process and trend of landscape pattern of cropland utilization in typical basins of karst mountainous areas in southwest China for their food security,sustainable development,and rural revitalization.This paper employed multi-period high-resolution remote sensing data,landscape pattern index,hotspot analysis,and other methods to study the temporal and spatial evolution law of the landscape pattern in the Beipanjiang River Basin from the perspectives of cropland utilization scale and cropland utilization pattern.The results show that the area of cropland in the basin shows a decreasing trend from 2010 to 2020,with a total decrease of 1 855.77 km2,accompanied by increasing fragmentation and decreasing aggregation.Spatially,there is a large-scale and morphologically complex aggregated distribution of cropland in the northwestern part of the basin and a small-scale and regular aggregated distribution in the southeastern part.Cropland in the basin is mainly developed into forests,gardens,and construction land,and smaller scale and larger complexity indicate a higher possibility of developing into other types of land.