四川小相岭山系植被景观的斑块特征分析

利用3S技术与景观生态学相结合的方法,分别从斑块的基本特征、形状特征、聚集与散布特征以及多样性特征4个方面对四川小相岭山系的植被景观空间格局进行了详细分析。研究结果表明：1）该山系存在9种植被类型,斑块数为1849,斑块面积约186951hm^2。其中,针阔叶混交林分布面积与密度最大,是山系的基质植被类型;而次生落叶阔叶林面积最少,景观地位最弱。2）常绿落叶阔叶混交林形状最为简单,但聚集度高;而针阔叶混交林形状最不规则,边界最为复杂;另外,次生落叶阔叶林连接性最弱,高山草甸斑块聚集程度最高。3）该山系斑块的多样性、优势度、均匀度指数值分别为1．54、0．66和0．67,植被类型丰富多样、植被错综复杂、各植被斑块间镶嵌度较好。

Analysis Oil 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 metieulously 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 Lmdscape ecology.Our results indicate that:(1)there are 9 vegetation types in these Mountains with 1849 number of patch,186951 hm~2 areas.Coniferous and broad-leaved mixed forest is the background of the area because of its biggest distribution area and densest inlaidthere;Secondary deeiduous 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 aggeegation.But Coniferous and broad-leaved mixed forest is of the most complicated of both patch shape and edge.Be-sides,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.