摘要
在Arcgis 9.3和FRAGSTATS 3.3的支持下,运用景观生态学原理,选取斑块面积、斑块数、斑块密度、边缘密度、最大斑块指数、斑块平均面积、形状指数、分维数、聚集度、景观多样性指数等指标,分析典型岩溶区县—重庆市酉阳县的森林景观格局的变化特征。结果表明,从2002年到2012年,研究区森林景观格局变化显著,有林地面积百分比从24.6%增加到41.5%,非林地、宜林地和灌木林地面积减小;总斑块数目增加43 267个,粒级结构以小斑块为主,景观整体趋于零碎化;斑块密度、边缘密度增加,最大斑块指数和斑块平均面积降低;斑块形状向着复杂化和不规则化方向发展;景观要素斑块在空间上的分布向着多样化和均匀化程度发展,森林景观异质性加强。研究区为典型岩溶区县,生态环境脆弱,10年来,森林面积虽然有所增加,但整体景观更加破碎化,受人为干扰的影响较大。
Based on the theory of landscape ecology, under support of Arcgis 9.3 and FRAGSTATS 3.3, indexes as total area, number of patches, patch density, edge density, largest patch index, patch mean area, Landscape Shape Index, Perimeter-Area Fractal Dimension, Aggregation Index, Shannon＇s Diversity Index, Shannon＇s Evenness Index and other indexes were used to analyze the forest landscape pattern characteristic of the typical karst county, Youyang county. The results indicated that the forest landscape pattern of study area changed significantly from 2002 to 2012. The percentage of forest area increased from 24.6% to 41.5%, but the non-forest, barren land and shrub land area decreased; The amount of landscape patches increased 43 267, however, graded structure was dominated by small patches, and the overall landscape tended to be fragmental; The landscape density and edge density increased, while the largest patch index and patch mean area decreased; The patch shape developed in the direction of the complication and irregularity; Distribution of the patches in space developed towards diversification and uniformity, thus forest landscape heterogeneity strengthened. The study area, with fragile ecological environment, is a typical karst county. Although the forest area has increased during the past 10 years, the overall landscape fragmentation level became more serious, owning to human activity.
出处
《广东农业科学》
CAS
CSCD
北大核心
2013年第21期145-151,F0002,共8页
Guangdong Agricultural Sciences
基金
国家科技支撑计划项目(2011BAC09B01
2006BAC01A16)
重庆市自然科学基金(CSTC2009BA0002)
关键词
森林景观格局
景观指数
动态分析
forest landscape pattern
landscape index
dynamic analysis
