长株潭地区耕地景观安全时空格局动态变化分析  

Analysis on the Dynamic Changes in Spatio-Temporal Pattern of Farmland Landscape Safety in the Chang-Zhu-Tan Area

作　　者：刘帆宇 曾雨桐 刘窑军 LIU Fan-yu;ZENG Yu-tong;LIU Yao-jun(School of Geographical Sciences,Hunan Normal University,Changsha 410081,China;Hunan Provincial Land and Resources Planning Institute,Changsha 410007,China)

机构地区：[1]湖南师范大学地理科学学院,长沙410081 [2]湖南省国土资源规划院,长沙410007

出　　处：《湖南师范大学自然科学学报》2024年第3期19-27,共9页Journal of Natural Science of Hunan Normal University

基　　金：国家自然科学基金资助项目(U22A20611,42377336)。

摘　　要：分析区域耕地景观安全的时空变化,对协调长株潭地区城市发展建设与耕地安全保护具有重要意义。本研究采用中国科学院遥感与数字地球研究所提供的土地利用数据,在斑块和景观尺度上,计算景观类型斑块破碎度、景观类型边界破碎度、面积加权形状因子、分维数和景观分离度5个耕地景观格局指数,构建耕地景观安全评价模型,定量评价长株潭地区1995—2020年耕地景观安全及变化。结果表明:(1)长株潭地区耕地景观安全指数由0.470 9降低至0.258 1,耕地景观安全水平总体呈下降态势;(2)各区域耕地景观安全指数变化可分为波动递减型、动态稳定型和小幅增长型3种类型,且与1995年相比,2020年长株潭地区耕地景观安全等级低的区域由近、中郊区县扩展到除浏阳市、茶陵县、炎陵县和长沙市市辖区以外的所有区县;(3)耕地景观斑块破碎度不断增大,多数区域耕地景观分离度有所提高,部分近中郊区域耕地斑块形状有待进一步规整,是长株潭地区耕地景观安全存在的主要风险。The analysis of spatial and temporal changes in the regional farmland landscape security is of great significance for coordinating the urban development and farmland security protection in the Chang-Zhu-Tan area.This study used land use data from the Institute of Remote Sensing and Digital Earth of the Chinese Academy of Sciences to analyze farmland landscapes.Five key indices of farmland landscape patterns were calculated in this study.These indices included landscape type patch fragmentation,landscape type boundary fragmentation,area-weighted form factor,fractal dimension and landscape separation,applied at both patch and landscape scales.These metrics allowed us to develop an agricultural landscape security model,which was then used to quantitatively evaluate the security and change of farmland landscape in the Chang-Zhu-Tan area from 1995 to 2020.The results are as follows.(1) The farmland landscape security index in the Chang-Zhu-Tan area decreases from 0.470 9 to 0.258 1,and the overall level of farmland landscape security shows a decreasing trend.(2) The changes of the farmland safety index in each region can be divided into three types:fluctuation decreasing type,dynamic stable type and small increasing type.Compared with 1995,the areas with low farmland safety grades in the Chang-Zhu-Tan area have been expanded from near-middle suburban counties to all counties except Liuyang city,Chaling county,Yanling county and the municipal district of Changsha in 2020.(3) The fragmentation of farmland landscape is increasing,the separation of farmland landscape in most areas is improved,and the shape of farmland patches in some near-middle suburban areas needs to be further normalized,which is the main risk of farmland landscape security in the Chang-Zhu-Tan area.

关 键 词：耕地景观安全 安全评价模型 动态变化 长株潭地区 

分 类 号：K903[历史地理—人文地理学]