| At present,our country is in the key period of reform.Because of the rapid urbanization and the rapid industrialization,the demand for construction land is continuously aggravated,which leads to the phenomenon of encroaching on a large amount of cultivated land,and the shortage of cultivated land reserve resources.The phenomenon that leads to the contradiction between man and land is becoming more and more serious,which seriously restricts the development of economy.For this reason,the state has taken a series of protective measures,so that the information on cultivated land resources,the present situation of cultivated land resources and the scientific management of cultivated land resources have been accurately grasped,and the complicated data have been standardized and standardized through effective management methods.It is of great significance to establish a core information database of cultivated land resources for rational utilization and protection of cultivated land resources,macro monitoring,law enforcement by relevant departments,and providing favorable data support and reference basis.This paper takes Xingguo County as the research object,and the data of the first phase of the General Survey of Geographical conditions provided by the Jiangxi Provincial basic Geographic Information Center.As the data support of this paper,the cultivated land database of Xingguo County is constructed by the ArcSDE for Oracle model as the basic platform for the application and analysis of subsequent data.The spatial distribution characteristics of cultivated land in Xingguo County are analyzed from the perspective of GIS spatial analysis,and the landscape pattern theory is used for reference.The change law of cultivated land landscape pattern is analyzed from the angle of quantification.(1)Based on the general survey data of geographical conditions,the relevant standards and norms for the establishment of database for the general survey of geographical conditions were established.After processing and checking the data,the spatial database of cultivated land in Xingguo County was established.(2)The database is constructed by ArcSDE for Oracle,and the Oracle database and ArcSDE are compared with each other.The spatial data engine is configured to make the storage and utilization of database more efficient and fast.(3)Based on the database,this paper analyzes Xingguo County from the angle of topographic information factors of high level and slope,and according to the spatial distribution characteristics and data statistics of the analysis,Xingguo cultivated land mainly concentrated in the southwest-central flat valley and low slope.(4)The change characteristics of cultivated land landscape pattern in Xingguo County were analyzed by using landscape pattern theory,and the farmland landscape was further subdivided into paddy field and dryland landscape,which was required by the index model of cultivated land landscape pattern.It is concluded that there are some differences between paddy field and dryland in landscape index index.According to the characteristics and data of index description,paddy field is far more divided than dryland.Although the patch density of paddy field is higher than that of dry land,the former has higher patch fragmentation and heterogeneity than the latter.This also indicates that the paddy field is affected by artificial transformation in reality,and the main reason is that the paddy field is superior to the dry land in the spatial position,combined with the spatial distribution map of cultivated land in Xingguo County.Most of the cultivated land in Xingguo is in flat valley and low sloping land.From elevation and slope planting area and proportion can also be confirmed.At low altitude,low slope zones are also the main areas of human concentration and activity.Due to social development and other factors,a large number of man-made occupation of cultivated land,which is the main reason for the high degree of fragmentation and heterogeneity of cultivated land. |
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