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近20年以来,随着我国经济结构的调整和农村劳动力的转移,部分地区冬闲田的面积呈明显增长态势。为了科学、合理及高效地利用冬闲田资源,本研究以长江中下游农业区为实验区,利用长时间序列NDVI数据,结合研究区耕地空间分布和农作物在出苗期和成熟期NDVI变化特征,构建了NDVI动态阈值法的冬闲田遥感监测方法,进而对研究区2007至2008年冬闲田的空间分布和闲置时间进行了提取分析。研究发现,2007至2008年,我国长江中下游农业区冬闲田总面积为20.55万km2,占耕地总面积的45.49%。冬闲田集中分布于研究区北部和西北部的江苏、安徽、河南、湖北、湖南和江西的西北部地区,其中,湖北、湖南和江苏是冬闲田分布面积最多的省份,3省冬闲田面积占了研究区冬闲田总面积的53.41%。
In the recent 20 years, with the adjustment of China’s economic structure and the transfer of rural labor forces, the area of winter fallow fields in some areas showed a clear growth trend. In order to utilize the resources of winter fallow fields scientifically, reasonably and efficiently, this study took the agricultural area of the middle and lower reaches of the Yangtze River as the experimental area, using the long-time series NDVI data, combining with the spatial distribution of arable land in a study area and the characteristics of NDVI changes at the emergence and maturity The NDVI dynamic threshold method was used to monitor the winter fallow fields, and the spatial distribution and idle time of winter fallow fields from 2007 to 2008 in the study area were extracted and analyzed. The study found that from 2007 to 2008, the total area of winter fallow fields in agricultural areas in the middle and lower reaches of the Yangtze River in our country was 205,500 km 2, accounting for 45.49% of the total cultivated land. The winter fallow fields are concentrated in the north and northwest of Jiangsu, Anhui, Henan, Hubei, Hunan and Jiangxi northwest of the study area, among them, Hubei, Hunan and Jiangsu are the provinces with the most winter fallow fields, 53.41% of the total area of the winter fallow fields in the study area.