Abstract
Using the technology of remote sensing,geographical information system and the analysis software of landscape pattern,the paper analyzed four sensing images of Tetraena mongolica distribution region in different periods(1977,1990,2000,2005) to study the dynamic changes of temporal and spatial landscape patterns based on the images interpretation and landscape classification and cartography and the calculation of landscape index,The results show:(1) On landscape scale,patch number,landshape index,Shannon's diversity index and Shannon's evenness index were increased,while mean patch size and dominance index were decreased year after year.It is indicated that the landscape pattern tended to be fragmented,landscape components tended to be complicated in the distribution region of T.mongolica.(2) In the different habitats of Tetraena mongolica the landscape patterns in Shizuishan,Taositu,Qianlishan and Wuda populations were fragmented.The landscape structure tended to be diversified and complicated.While the landscape patterns in Wujiamiao,Qipanjing and Hainan populations were relatively integrated because of less severe human driving force.And there were preponderant patches connected each other in the landscape.(3) Of all of the landscape types,T.mongolica was the maximal landscape component and basic landscape type in the research region,but its dominant status was reduced in the 28-year period of and its distribution tended to be dispersed and fragmented.Besides the land for industrial,urban construction and farming purposes as well as desertified land and other vegetations were largely increased and tended to be connected.Their functions in the landscape were increasing gradually.(4) It is indicated that the industrial development and rapid urbanization and land desertification caused by irrational land use were direct reasons for the T.mongolica population area reduction and landscape pattern change of the research region.
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