Research On Spatial Assembling For The Anti-typhoon Shelter Forest In Sanya City

Ecological environment is the basic condition of human survival and development. The coastal areas play a significant role in the national economic and social development of the country. But this area is also the highest area and frequency of natural disasters, such as typhoon, storm, tsunami and the red tides, which have become one of the factors restricting the development of coastal cities.The landscape performance in urban greenbelt construction had been mainly considered before. In this study, the performance of precaution of the typhoon as the key point, combining with the landscape benefit and coastal city features, by choosing appropriate tree species, to build more tree species, multi-level and efficiency of the typhoon nearly natural tropical and subtropical city greenbelt system of forest protection and landscape forest construction technology, the results were as followed:(1)More than70%of greenbelt was accessory greenbelt in Sanya city, and the landscape function was given priority to, but its protective function was low. The protective greenbelt were much fewer, accounts for only1.98%, they cannot fully played an important role of the forest in defense of natural disasters and maintain the ecological balance. So it was necessary to adjust to the species and community structure. According to the level of typhoon shelter forest and forest and the diversity of Sanya city community about typhoon shelter forest system, the shelter forest function was layout. We can use a variety of tropical tree species mixed collocation, to make community structure more stable and reasonable use of land space hierarchy.(2)The wind defense performance was also measured in the anti-typhoon shelter forest. Results showed that greenbelt can reduce the typhoon wind speed to a certain extent. Wind speed reduced significantly after typhoon pass through the anti-typhoon forest belt. Again, wind speed increased in the open area but it is still smaller than the wind speed before passing through the forest belts. Forest belt located in the coastal area, due to its long forest age and trees lush, it had a great effect on the reducing of the typhoon wind speed in the coastal city, and different kinds of tree species and planting types for the protection of the typhoon were also different. So, it was very important to study plant growth status, plant behavior and the sort in typhoon shelter forest system of Sanya city. (3) By the type of greenbelt of tropical coastal city, we put forward four types of green upgrading schemes, namely, the urban coastal typhoon shelter forest green upgrade, unit accessory green space upgrade, upgrading urban park green space and urban road green space protection upgrade, etc. to form the "two belts, one net, three point, three line" for the purpose of the overall layout. For this, city center should be established including mountain, pastoral, wetland, urban green space to combined the dot, line, face with landscape environment and green corridor,and further come to the combination of urban green ecological barrier, build superior tourist city landscape and greening landscape environment.