Spatial Distribution and Optimization of Cultivated Land Use Potential in Winter of Southern China from the Perspective of Food Security:A Case Study of Poyang Lake Plain
The purpose of this study is to explore the spatial distribution and optimization characteristics of cultivated land use potential in winter in the context of the new round of grain production capacity improvement action.The research methods include the EcoCrop model,GAEZ model and literature review.The research results showed that:1)the average proportion of crop planting area in winter in the study area is about 50%in recent 30 years,and show a significant decreasing trend in 2007 as a mutation year.2)The cultivated land resources have great potential to improve the use efficiency in winter and increase grain yield.97%of cultivated land in the study area is suitable for winter seed,which can achieve a total yield increase of about 4.4 million tons to 4.9 million tons and can indirectly increase rice production by about 0.42 million tons.3)There are obvious spatial differences in the distribution and yield of winter rape and Chinese milk vetch under different potential winter planting windows,which further refines the spatial and temporal characteristics of crop planting.The optimization scheme combining crop type and planting window realizes the synergy of high spatial suitability and grain yield.In conclusion,this study proposes the spatial distribution characteristics and optimization plan of cultivated land use in winter with more guiding value for agricultural production.It could provide technical support and path selection for intensive management and utilization of regional cultivated land,and optimization and adjustment of planting structure.
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