Investigation and Application Research on Landscape Plants in Lhasa

For finding out existing landscape condition in Lhasa, providing quantitative analysis of the landscape base situation and resolving the landscape related problems, the research had surveyed the landscape phytocoenology by biology-five-spots according to layer. The investigation had general surveyed the plant species and application in all parts of Tibet for the first time. In this study, we also analyzed and discussed the current situation, characteristics and problems of Lhasa landscape and put forward corresponding countermeasures. There are 45 families, 100 genera, 159 species (including varieties) in this investigation. The results showed that:(1) The highest importance value of arbor layer, shrub layer, herb layer were Prunus cerasifera f. atropurpurea, Platycladus orientalis cv. sieboldii, Poa pratensis, the important value respectively were 49.861, 27.756, 55.386 respectively. (2) The most application arbor and shrub layer in Lhasa was Rosaceae, the total of 27 species;The second was Salicaceae, the total of 18 species;the third was Oleaceae, the total of 9 species; the forth was Cupressaceae, the total of 8 species; the fifth was Leguminosae, the total of 6 species and they occupied 24.77%, 16.51%, 8.26%, 7.34%, 5.50% respectively in the investigating arbor and shrub plants. (3) The landscape plants in Lhasa were not rich and the planting development was lopsided. (4) The proportion of landscape plants composition was not reasonable, the adventitious plants were too high and the indigenous plants were too low.