Research On The Delimitation Of Territorial Space Based On Suitability Evaluation

In the process of rapid urbanization,the land problem of our country is becoming more and more prominent.With the continuous expansion of urban and rural construction land,agriculture and ecological space have been severely squeezed,the contradiction between construction and development and agricultural production,and ecological environmental protection is extremely acute,and the incoordination among the three has triggered people’s food security.Ecological security is of great concern.Since the 18 th CPC National Congress,a series of central meetings and documents have repeatedly proposed the scientific delineation of the "three zones and three lines," namely,the delineation of the red line for towns,agriculture,ecological space and ecological protection,the protection of the red line for permanent basic farmland,and the boundary for urban development.Optimize the spatial structure and establish the cooperative relationship between protection and development.This paper takes Dali city as an example,on the basis of dividing the land space into single suitable space and compound space,the compound space is restricted and suitable from the function of towns and cities,and the suitability of agricultural function,respectively.Four aspects of ecological function suitability are selected to construct the evaluation index system,and many kinds of suitability(abbreviated as multi-suitability)evaluation are carried out.According to the results of multi-suitability evaluation,the suitable grade of each evaluation unit was determined from the perspective of urban development,agricultural production and ecological protection.The single suitable space and the evaluation results from different angles of view are superimposed,and the three kinds of land spaces,namely,town,agriculture and ecology,are divided into three categories under different angles of view.Knot According to the actual situation of Dali,the delimitation scheme from the perspective of ecological protection is chosen as the result of three kinds of spatial delimitation of Dali city,town,agriculture and ecology.At the same time,the control measures of three types of space are put forward.Through the study,Dali City delimited 9959.40 hectares of urban space,accounting for 5.73% of the total area of Dali City;31966.99 hectares of agriculturalspace,accounting for 18.38% of the total area of Dali City;Designated ecological space of 132000.49 hectares,accounting for 75.89 percent of the total area of Dali City.The results show that the three spatial distribution rules of Dali city are as follows: the proportion of urban space is the smallest,mainly concentrated in Xiaguan town,Dali town and Fengyi town in space;The agricultural space is mainly concentrated in the central dam area,showing the characteristics of concentrated distribution of Hercynian and separate dispersal of East China Sea;the ecological spatial distribution is wide,and most of them are distributed.The proportion of villages and towns is more than 60%.The result is consistent with the distribution of the key ecological functional areas,nature reserves and national parks in Dali City,and Erhai Lake should be protected.The three kinds of territorial spatial delimitation methods and control measures proposed in this paper provide a theoretical basis for territorial spatial planning and provide reference for other areas to carry out relevant research.The results of Dali city can provide the basis for the adjustment of permanent basic farmland and ecological protection red line and the delineation of urban development boundary in Dali city.