Study On Landscape Ecological Security Pattern Of Land Use In Dongsheng District Of Ordos City Based On GIS

Ecological security is a kind of bottom line state,which in the economic growth at the same time,not to destroy the ecological environment and human living space has not been squeezed.Land use landscape pattern is the key to ecological security in many factors.The construction of a reasonable and feasible land use landscape ecological security pattern has become a new orientation of ecological protection,which can guide the planning and management of land use and enhance the level of ecological security.The object of this study is the Dongsheng District of Ordos City,Inner Mongolia.Based on the land use data,social economic data,natural geographic data and field survey data,and with the help of the basic theory of landscape ecology,stood on the basic theory of landscape ecology and the method of landscape index analysis,the dynamic change of landscape ecological pattern in the past 21 years and the ecological problems caused by it are analyzed.Then,the MCR and the limiting factor method are used to optimize the spatial layout of land use landscape pattern and to achieve the optimization of spatial structure.Finally,using GIS spatial analysis technology to complete the construction of land use landscape ecological security pattern.Research results show:(1)From 1993 to 2014,the landscape pattern of land use in the study area changed significantly.Farmland and grassland landscape area decreased significantly,woodland landscape area increased,urban and rural construction land expansion.During the whole study period,the landscape change rate increases year by year,and the change of the area has the characteristic of fluctuation.The degree of landscape fragmentation is increasing and urbanization is obvious.In 21 years the dominant landscape has always been grassland landscape.Human activities prompted the increase in the number of land use landscape patches in the study area and the decrease of the area and the increase of landscape fragmentation.The promotion of urbanization has significantly affected the overall pattern of the region,and the landscape heterogeneity has been strengthened year by year.(2)The present state of land use landscape pattern security evaluation results:The whole study area was observed,the security area is concentrated in the eastern region,and the western and central regions are also slightly distributed;The area of moderate safety and critical safety area is not large,but is distributed in the whole area;Unsafe areas are mainly concentrated in the central region.(3)Evaluation results of land use landscape ecological suitability:The middle and high farmland landscape is located in the central and eastern part of the gully terrace,where the water conditions are good,the irrigation guarantee rate is high,and the effective layer is thick;Secondary and higher forest landscape mainly distributed in eastern and western Chaideng regions in these areas,has certain water conditions and soilfertility in general;The grassland landscape is suitable in the whole range.(4)Results of multi-objective optimization:woodland landscape area was significantly reduced,water area and wetland landscape,farmland landscape and artificial forest landscape area increased significantly.(5)The result of land use landscape ecological security pattern:The area of the farmland landscape increased,mainly distributed in Bojianghaizi Township,township board wood and rare Taiwan town etc.relatively flat terrain and irrigation to ensure regional or urban and rural residents around.The number and spatial distribution of grassland landscape changed little.The status of unused land has good soil,topography and water resources conditions,but no reclamation,can be converted into farmland landscape or woodland landscape.Urban and rural construction landscape area decreased slightly,the number of construction land can meet the needs of the population in 2020,in the future construction land use should pay attention to the use of internal potential.The research results can provide reference for the land use and planning management and the construction of ecological security pattern.