| The Guilin Lijiang valley, which possesses many unique world nature landscape resources, is one of the tourism places that were exploited earliest in china. With the development of tourism industry, however, some landscape resource have been destroyed, and the landscape structure has been influenced to much extent. On the basis of landscape ecology principles and methods, thinking over the level of the valley landscape and the influencing character of local people activities, selecting the patch density, landscape fragment, landscape diversity, landscape dominance and landscape proportionnable index, and so on, this paper analyzes quantitatively the landscape stucture of the Lijiang valley. At the same time, the mechanisms and causes of tourism development on the landscape structure and its change, landscape function, the landscape pattern and its prediction have also been studied. These quantitative results are not very more in china presently.Tourism develope and human actvity are the main reasons for landscape structure change. When the disturbence becoming severly, fragmentation, heteroity and the landscape diversity in this area will increase. There exists an inverse relationship between the landscape isolation and human activity for those man-made landscape types, such as landscape type (farmland, plantantion, industial area) or nature landscape type (nature woodland), a direct realationship between the landscape isolation and human activity. It is such conclued that the human activity has a strong impact on the landscape structure.The infrastructuer buffer zones and road buffer zones are to assess the impact of tourism development on the landscape structure. The influences on the vegetation ecological attributes mainly includes the species distribution, structure constitution and vegetation morphology, etc.. The results show that: in the 2-4m of road buffer zones and 0-10m of infrastrctuer buffer zones, the density of dominant species and biomass will decrease for herbs, and abundance and proportion will get bigger than other exents (inner species increasing owing to the outer species invading); In the shrub disturbence extent, There exists an inverse relationship between the influence degrees and buffer zones; In the 40m of infrastructure buffer zones, there has the biggest influence on the trees, however, the effect of road buffer zones is unobvious, only a small change on the morphology.The influences on the soil ecological attributes mainly include the quality, structure, the loose and tense degree, the vegetation root content, pH value, unit weight, organic matter, the content of nutrient elements, and so on. It is the biggest impact on the destructive district. The results are mainly as follows: sticky quality, tuber structure, the loose and tense degree, unit weight, pH value (decreases in the few conditons that resulting acidity strengthening), alkalinity increases in the same soil level, root quantity and macro-element content decreases; There has a extraordinary difference between K, Ca and Mg, especially for Pb and Cd which shows that the collecting function of soil enhances under the disturbence conditon, and other micro-elements, such as Zn> Mn, Cu, Ni get decreasing.Tourism activity is one of the key reasons for water body pollution. To different recreation types, the pollution degree has the obvious difference. In the same recreation type, different using frequencies and visitor density has different pollution impact on the water body.The change of landscape structure have great impact on its function. The tourism development actuvities not only destroy species, but also accelerate its flowing. When destroygetting deeply, nutrient elements and soil will lose severly. The energy can converse and exchange among buffer zones.According to the tourist capacity analyzing of the typical tourism sites in different landscape zones, the landscape patterns have been predicted for the future. In the upstream middle-mountain forest and meadow landscape zone, the pattern will develop...
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