Analysis And Optimization Of Spatial Pattern Of Ecological Land In County Area

Ecological land as security protection and stability of regional ecological system,maintaining regional ecological balance,to provide the service function of ecological products and play an important space,on the regional geological disaster protection,water resources and biodiversity conservation plays an important role.Degeneration of the cultivated land quality,urban sprawl,excessive development present situation of land resource,ecological land lead to the cultivated land protection,the contradictions between development and ecological protection construction land is increasing.Optimization for construction and development of agricultural production constraint of ecological land use spatial pattern,coordinate the contradiction between economic development and ecological protection,for the sustainable development of regional social economy and ecological protection is of great significance.Land use status based on the city of dujiangyan,the use of landscape pattern space stress evaluation methods,combined with the existing general Arc GIS spatial analysis of dujiangyan city ecological land use pattern are analyzed,and explores the general ecological land in dujiangyan and the relationship of ecological land space stress;Secondly from the ecological service function of land use,to water resources protection,disaster protection,landscape recreation and biodiversity conservation as the main body of ecological service function,using the Arc GIS spatial analysis,identify regional comprehensive key ecological land use spatial pattern;Finally to core type key as the source of ecological protection,ecological land to construction land development economic suitability,the pressure and ecosystem services of cultivated land protection for resistance,build dujiangyan minimum cumulative resistance model of ecological land space protection,optimal simulation for dujiangyan city ecological land use spatial optimization scheme.The main conclusions are as follows:(1)The existing general ecological land of dujiangyan is 71804.52hm2,accounting for 59.42% of the total area of the city.The existing construction land is 18646.19hm2,accounting for 15.43% of the total area of the city,and the potential space of developable construction land is 3564.89hm2,accounting for only 2.95% of the total area of the city.Therefore,it can be seen that dujiangyan city has a good ecological land foundation,but the development potential of construction land is insufficient.(2)General ecological land use patches total 77443,dujiangyan patch perimeter amounted to 26073 km,with the general ecological land ecological land adjacency number plaque is 28685,among them of land for agricultural production accounted for 25.09%,11.95% for development and construction;The adjacent length of general ecological land and non-ecological land is 8190.59 Km,of which agricultural production land accounts for 2.87% and development and construction land accounts for 11.95%.The relationship between the existing general ecological land and non-ecological land is complex,which is affected by the development and construction land.(3)The existing general ecological land affected by non-ecological land in dujiangyan city is up to36167.05 hm2,accounting for 50.36%.Based on the development of general construction land ecological risk of land ecological security coefficient of 3.04,and 2.57 higher than that of land for agricultural production,the existing general ecological land by the high degree of ecological land stress,and is subject to the threat of construction land development degree is higher than the land for agricultural production,regional ecological protection and social economic development and construction of contradiction is more outstanding.(4)The ecological land structure with the main ecological service functions of water security,disaster protection,landscape recreation and biodiversity protection constitutes the key ecological land space of dujiangyan city.Identify the north and west of dujiangyan importance level was significantly higher in the mountains of key ecological land area in eastern and southern plains,of which the core type key ecological land with a total area of 51919.61 hm2,accounted for 42.96% of the total,72.31% of the total area of the general ecological land.(5)The optimal ecological land space optimization scheme of dujiangyan city was determined,and the suitable scale of ecological land in dujiangyan city was 57110.76 hm2.Scale compared with the existing general ecological land has decreased,but regional core type key ecological region obtained the very good protection,guarantee the ecological efficiency is not falling,and greatly reduce the dujiangyan the contradiction between ecological protection and social economic development and construction.