摘要
该文利用Fragstats和ArcGIS计算苗二河流域森林景观特征和不同景观粒度下森林景观异质性指数,研究分析得出以下结论:1)苗二河流域有林地和非林地景观为优势地类,分布比较广泛;无立木林地面积小,分布比较集中;其它地类景观为劣势地类;2)随着景观粒度增加,苗二河流域森林景观斑块形状越来越规则。景观中斑块数量较多,形状不规则,边缘曲折迂回程度较高。该指数同时反映出苗二河流域景观斑块聚集和离散程度,表明随着景观粒度增加,斑块呈现聚集状态;3)随着景观粒度的增加,平均分维数整体趋近于1,苗二河流域斑块形状周长较简单,趋于正方形等简单形状;4)随着景观粒度增加,聚合度指数不断下降,苗二河流域景观斑块破碎化程度不断上升。通过森林景观特征和不同粒度景观异质性分析,为科学合理规划建设苗二河流域森林景观提供指导。
The forest landscape features and the forest landscape heterogeneity index of different landscape grain-size were analyzed in Miaoer River basin by using Fragstats and ArcGIS. The results showed that：（1） Forests and non-forests were advantage land type,which were widely distributed in Miaoer River basin. The area of no stumpage forests were small and centralized distribution. The other land types were disadvantages land type.（2）The shape of forest landscape patch were more and more regular with increasing grain-size, Landscape patches had larger quantity,a large quantity of the forest landscape patches had irregular shape and higher degree of edge twists. At the same time, the landscape index reflected gathered and discrete degree of the forest landscape patches,which had a gathered state with increasing grain-size.（3）The average dimension of whole tended to be 1,and the shape of landscape patch tended to be square with increasing grain-size.（4） Gathering Index （GI）declined, and fragmentation degree increased of landscape patch with increasing grain-size. By analyzing the characteristic of the landscape patch and different landscape grain-size hetero-geneity,it can provide guidance for scientific and rational planning and construction of landscape patch in Miaoer River basin.
出处
《热带林业》
2016年第2期26-29,共4页
Tropical Forestry
基金
基金项目:贵州省石漠化监测与评价
关键词
粒度变化
苗二河流域
森林景观
景观异质性
Grain-size variation
Miaoer River basin
Forest landscape
Landscape heterogeneity
