基于时间窗口阈值法的山丹县农作物种植结构变化

Abstract

及时准确地获取区域农作物种植结构信息，对于保障区域农业可持续发展及国家粮食安全都具有重要意义。本文以黑河流域山丹县为研究区，基于TM/ETM+影像，利用时间窗口阈值法对山丹县2007和2012年大麦、小麦、油菜和玉米的空间分布进行遥感识别，并分析其变化。结果表明：1) 山丹县农作物种植结构提取总体精度87.20%，Kappa系数0.84。2) 2007~2012年，山丹县大麦的种植面积和种植比例呈下降趋势，小麦、油菜和玉米的种植面积和种植比例呈增加趋势，其他农作物的种植面积小幅增加但种植比例下降，增加的小麦、油菜和玉米主要由其他农作物转移而来。 Timely and accurately obtaining crop planting structure is crucial for guaranteeing the agriculture sustainable development and national food security. Taking Shandan County in the Heihe River Basin as the study area, we adopted a time window threshold method based on TM/ETM+ image to extract the spatial distribution of barley, wheat, rapeseed and corn of Shandan County in 2007 and 2012. The changes in the crop planting structure and the driving forces behind them were also analyzed. The results show that: 1) the overall accuracy of crop planting structure extraction was 87.20%, with Kappa coefficient of 0.84; 2) the planting area and proportion of barley decreased during 2007-2012, while those of wheat, rapeseed and corn increased. The planting area of other crops slightly increased while the planting proportion of it slightly decreased. The increased wheat, rapeseed and corn were mainly converted from other crops.