The Rearch On The Rorest Ecosystem Construction Construction Techniques Around The City Of Nanning

With the acceleration of urbanization, environment problems become more and more serious, the construction of urban forest ecosystem has become the most important content of the construction of urban forestry, this paper approaches the inner 100m and outer 1000m of Nanning city highway and the visual side slope land as the construction range, in order to build a forest green belt and protection, transform the existing forest as the main content of construction. Combined with discipline theory;such as city forest ecology, landscape ecology, landscape ecology theory,forest aesthetic as research basis. The analytical hierarchy process (AHP),TOPSIS method, the dynamic clustering method are used respectively as the research method of Nanning city forest ecosystem construction technology. And the research results are as follows:(1)The planning scope of this paper for Nanning city forest ecological circle is intended to be nanning city highway as axes of a specific geographical area ecological system, and its range stretches approximately 82 km, main line along the city highway inner side 100 m, the outer side 1000 m and the visual lateral side slope land of forestry area,and that is the open carrier of ecological service function made up of the forest and its geographic environment which and Nanning city landscape system and the areas surrounding the ecological system of agriculture constitute Nanning urban ecological security barrier, nanning city is an important part of the construction of the forest.(2)The present situation investigation results show that the total forest ecosystem land area of Nanning is 9516.87 hm2, of which 4008.04 hm2 woodland, accounting for 42.1%,5508.83 and 57.9% hm2 non-forest. According to the earthy land ownership it is divided as state-owned land hm2 1991.84, accounted for 20.9%;Other state-owned land hm2 218.35, accounted for 2.3%; Collective land area of 7306.68 hm2, accounted for 76.8%. And the forest woodland,the forest area is 2506.43 hm2, accounted for 62.53%;sparse woodland 45.18 hm2, accounted for 1.13%; Shrub land 41.67 hm, accounted for 1.04%; None-forested land is 1084.18 hm2, accounted for 27.05%; 92.28 hm2 cleft, accounting for 2.30%, waste mountains 238.30 hm2, for 5.95%. The forest coverage rate is 27.31%. It is expected to increase the new forest area of 1205.75hm2 through the compliment of ecosystem and the forest coverage rate increased to 42.12%, an increase of 14.81%.(3) The analytic hierarchy process (AHP) is first used to establish the evalution model of Nanning forest ecosystem greening mode,and combined the TOPSIS to overall evalute the 85 construction greening model, and using dynamic clustering method to classify the sort result and the evaluation results show that:the good greening models are 17, the medium performances are 58 and the poor performances are 10. Through comprehensive analysis, combining ecological circle site conditions, forest land types, forest category status, use all sorts of forest technology will show more than 75 kinds of medium greening model as the construction of ecological circle green community configuration mode.(4) Five aspects of building forest ecological circle of Naning are put forward:①According to the city forest land use on the ecosystem approach to obtain land for construction in three ways, namely, land construction, rental and guide land owners to build their own building by planning.②City forest ecosystem landscape layout by the circle "part of five belts" and jump layout "ten nodes" composition.③Construction of city forest ecosystem works by important landscape nodes, the construction of wetland protection and restoration projects (point building), the important forest landscape construction projects (line building) and green pattern of ecosystem protection and maintenance of engineering construction of auxiliary projects (surface building).④Preferred construction of green trees and green patterns 45 of 75 species, combined with ecosystem specific spatial layout of the landscape with the design and landscape mode nodes. (5) Discussing of the ecosystem around the city should follow the principles of plant configuration, configuration of the building community structure proposed four options, namely, community watch-type configuration mode, configuration mode of ecological communities, the production model green community construction, bamboo construction model optimization.Forest ecosystem built around the city of Nanning City to suburban forest ecosystem security system throughout the country and even the city of Nanning forestry development and forest provide scientific basis for the construction of the city.