基于景观级别指数的典型喀斯特石漠化空间格局分析

贵州喀斯特高原山区,地面破碎,人地矛盾突出。依托地理信息系统与遥感技术,以大方县桶井村为研究区,从其影像上解译喀斯特石漠化空间分布现状,建立石漠化空间数据库,从景观空间分析方法出发,基于景观级别指数定量化分析石漠化景观格局特征,经统计综合分析石漠化景观的相关指数,得出研究区石漠化发育程度及其分布情况具有较大差异,整体破碎度较低、均匀度较高,石漠化发育程度较高的斑块面积较小,不连续,镶嵌在各类景观类型中。研究区土地石漠化现状对生态建设有较大的影响,可根据景观指数分析结果对研究区进行土地利用结构调整与石漠化综合防治。

Spatial pattern analysis of karst rocky desertification based on landscape level index

Located in the karst mountain plateau,ground is fragmented,conflicts among human activities and soil are sharp.Based on the technologies of geographic information system(GIS) and remote sensing(RS),Tongjin village in Dafang County of Guizhou Province is adopted as study area.The spatial distribution status of karst rock desertification is interpreted and spatial database of rocky desertification is set up.Starting from the landscape analysis,based on landscape level index,desertification landscape pattern is analysed quantitatively.By comprehensive analysis of the relevant indices of desertification landscape,the result is that the rocky development degree and desertification distribution are quite different.Overall fragmentation is low,and evenness is high in study area.The patch area in higher-degree desertification is smaller,discrete,and insetted in the various landscape types.The present situation of rocky desertification has great influence over ecological construction in the study area.Results of index analysis can be used for land restructuring and integrated control of rocky desertification.