Abstract:

Based on the Landsat TM /ETM images and field survey data，the distribution, quality, spatial pattern and dynamic change principle of Tricholoma matsutake habitat in Ganzi region from the year 1994 to 2004 were studied with the aids of 3“S” techniques．This paper intends to provide scientific base for making decision for the protection and restoration of Tricholoma matsutake habitat.The results were as follows.(1)Three types of Tricholoma matsutake habitats were divided by means of the lifetype of community constructing species,sclerophyllous evergreen broadleaved forest,needlebroad leaved mixed forest and coniferous forest.(2)Enhancement of human disturbance activity leaded to the habitat landscape fragmentation and the ecotone area had an increasing tendency from the year 1994 to 2004,mainly including the increase of the total patch Edge Density,Landscape Shape Index,Interspersion Juxtaposition Index,Patch Richness and Shannon′s Diversity Index,and the decline of Largest Patch Index and Contagion Index.(3)Remote Sensing data showed that the forest area,which was closely associated with Tricholoma matsutake habitat,was up to 1 728 96309 hm2 in 2004,increased by 4329% compared with the habitat area in 1994.The habitat area of the Quercus aquifolioides and Picea likiangensis forest and Pinus densata and Quercus pannosa forest newly formed was 409 95468 hm2 and 24 61428 hm2 respectively during past decade years.Increasing in area,types and numbers of the habitat patches leaded to the delaying of the fragmentation process.(4)The Abies squamata forest,Pinus densata forest,Quercus aquifolioides and Picea likiangensis forest and Quercus semecarpifolia and Abies squamata forest were the dominant patch types.To boost the environmental quality of the Tricholoma matsutake habitat,it is necessary to adjust the dense,structure and composition proportion of Abies,Picea,Pinus,and Quercus species in the tree layer of coniferous forest and mixed wood as well as to improve the light conditions under forest to ensure the development of Quercus species