Study On Spatial And Temporal Variability Of Cultivated Land Use Efficiency Of Farmers Based On Remote Sensing

Cultivated land protection and food security are always been an important issue in the field of land resources management.Ensuring the quantity and improving the quality of cultivated land are the key points in the research.The quality of cultivated land is affected by objective factors and usually takes a longer time to improvet.Farmers have become one of the feasible ways to improve the utilization of cultivated land.Based on this,Yutian is selected as a study area.With the help of ENVI and ArcGIS,based on Landsat data,the temporal and spatial variation of cultivated land utilization in Yutian County during 2001-2017 was studied in a multi-level way.The study area provided references for the tapping of grain production potential.The main results are as follows:The traditional grain crops in the study area were mainly summer corn single and winter wheat-summer corn multiple cropping,and the former was about twice that of the latter.Influenced by the economy,the size of the Chinese cabbage planting had become the characteristics of the study area.It had increased from 3002 to 9155 hm~2 in 2001-2017.It shows the circle distribution centered on the county seat.The inner layer grew Chinese cabbage,and the outer layer grew winter wheat or summer corn.Under this planting structure,the township-scale multiple cropping index in the study area was between 1.2 and 1.6,and the intensive index of cultivated land was between 0.09 and0.79,with an average value of 0.29,which indicates that the intensive utilization degree was low and the regional difference was large.The proportion of townships with intensive utilization was 15%,20%and 65%.The three townships had three points of uniformity,one point and one line and one point and one side respectively in space.It is concluded that the overall utilization of cultivated land in Yutian is relatively low,and is insufficientat the level of farmers.The number of farming,economic conditions and farmers'part-time opportunities are the main reasons that affect farmers'enthusiasm for farming and the degree of cultivated land utilization.Figure 31;table 20;Reference 81...