Analysis on the Patch Characteristics of Vegetation Landscape of Xiaoxiangling Mountains in Sichuan Province

The spatial pattern characters of vegetation landscape of Xiaoxiangling Mountains in Sichuan were meticulously analyzed in four respects,that is,the basic characteristics,the shape characteristics,the aggregation and interspersion characteristics and the diversiform characteristics of patches,by the method of 3S technology combined with Landscape ecology.Our results indicate that:(1) there are 9 vegetation types in these Mountains with 1 849 number of patch,18 6951 hm2 areas.Coniferous and broad-leaved mixed forest is the background of the area because of its biggest distribution area and densest inlaid there;Secondary deciduous broad-leaved forest is of the lowest heterogeneity degree for its smallest area.(2) Evergreen broad-leaved and deciduous broad-leaved mixed forest is of the most simply shape,and high degree of patch aggregation.But Coniferous and broad-leaved mixed forest is of the most complicated of both patch shape and edge.Besides,secondary deciduous broad-leaved forest is of its least connectivity,and alpine shrub is of the highest degree of patch aggregation.(3) These Mountains' species richness,dominance and diversity are 1.54,0.66 and 0.67.It is found to be the main features of the vegetation landscape and the inlaid degree of each vegetation types is better in Mountains.