| Under the background of rural revitalization in the new period,the issue of agriculture has been widely concerned by all sectors of society,and agriculture,as a basic industry,plays an important role in production and life.With the continuous improvement of people’s quality of life,in order to meet the needs of diversification,it is necessary to understand the characteristics of crop planting.Through the analysis of crop phenology characteristics and space-time characteristics of planting,this paper can provide data support for planting structural adjustment and agricultural materials security,and plays an important role in improving the comprehensive production capacity of regional agriculture.In view of the current situation of crop planting characteristics in the southern Xinjiang county,this paper selects Karakax County,a typical agricultural county in southern Xinjiang,as the research area,uses MODIS,Sentinel-2 image data,extracts the phenology information and planting area of wheat,maize,rice,cotton and orchard,and carries out a study on the distribution characteristics of crop planting based on the characteristics of phenologying and space-time changes.The following conclusions are drawn from the above-mentioned studies:(1)Changes in crop phenology information.The crop growth curve was reconstructed by TIMESAT software,and the phenology parameters of crop were extracted by dynamic threshold method.According to the results of the extraction,the five crop showed an advance trend in terms of growth and a shortening trend in the growth quarter.(2)Crop planting area extraction.The crop planting area in 2016-2019 was obtained by using the object-oriented maximum like classification algorithm,and the overall recognition accuracy was more than 80% by yearbook comparison verification.(3)Characteristics of crop time change.The area under planting of five crop continued to expand in 2016-2019,with an average annual growth rate of 2%.In terms of the proportion of planting area,the ratio of wheat and rice was basically stable,the proportion of maize fluctuates between 17.94% and 22%,the proportion of cotton was gradually increasing,rise from 9.26% to 11.57% in four years,and the proportion of orchard was the largest,with an average ratio of 43.41%.(4)The characteristics of crop space change.In the spatial distribution,the crop were mainly concentrated and distributed,most are flaky and a few were striped.Based on the analysis of crop distribution characteristics by landscape pattern index,cotton fragmentation increased and other crop decreased in 2019,cotton and orchard showed irregular shapes,reflected random expansion,rice planting showed concentrated patches,and wheat and maize basically maintained their original shape characteristics.(5)Factors influenced the characteristics of crop distribution.Through the analysis of the factors influenced crop planting distribution,it was concluded that social and economic factors were the main factors affected crop distribution,especially population density and GDP per capita,natural factors have certain influence on crop distribution,and the influence of policy factors on crop planting distribution is becoming more and more prominent. |
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