晋南区冬小麦种植分布卫星遥感反演及时空变化分析  

Analysis of Temporal and Spatial Variations in Winter Wheat Growing Regions in Jinnan Region Using Remote Sensing

作　　者：米晓楠[1] 杨超[1] 李峰[2] 相栋 李孟蔚 赵永强[1] 闫加海[1] 

机构地区：[1]山西省气候中心,山西太原030006 [2]防灾科技学院,河北三河065201 [3]右玉县气象局,山西右玉037200

出　　处：《山西农业科学》2018年第3期378-382,共5页Journal of Shanxi Agricultural Sciences

基　　金：中国气象局气候变化专项(CCSF201730);山西省科技基础条件平台建设项目(2014091004-0101)

摘　　要：晋南区作为山西省冬小麦种植主产区,其冬小麦种植结构的变化对农业决策有着至关重要的影响。基于MODIS数据,将归一化植被指数(NDVI)作为一个波段,与可见光波段、近红外波段同时作为分析波段,分析主要地物波谱特征,确定反演冬小麦面积的理想时期,优化混合像元分解法的端元选取方式为裸地—冬小麦—林地—水体模型;然后提取了2000—2014年晋南区冬小麦种植面积分布,并结合实际统计数据对结果进行校正,校正后相对误差小于15%的县占总数的92.41%;基于提取结果对2000—2014年晋南区冬小麦种植分布变化和种植概率空间变化进行了分析。结果表明,晋南区冬小麦种植分布受地形因素影响较大,主要分布在运城盆地、临汾盆地、长治盆地和晋城市中部等地势较平坦的地区,且2000—2014年冬小麦面积整体呈下降趋势,长治减少幅度最大;晋南区冬小麦种植核心地带主要分布在临汾盆地和运城盆地,临汾盆地大部地区种植概率变化较小,运城盆地种植概率增减不一,晋城市种植概率下降较多,在长治盆地下降最为明显。Jinnan region is the major producing area for winter wheat in Shanxi province.The area of winter wheat planted in Jinnan region accountes for 96.74 percent of the total area of winter wheat planted in Shanxi province.The changes of distribution of winter wheat in this area are crucial to agricultural decision-making.Remote sensing can obtain different scale ground information,the data update cycle is short,and it is widely used in winter wheat identification.MODIS data has been available for more than 10 years since 2000,and has been widely used in crop planting and long-term monitoring.In this study,based on MODIS data,NDVI（Normalized vegetation index）was used as a band to analyze the spectral characteristics of the main surface features,along with the visible and near-infrared bands.According to the spectral characteristics of the main surface features,the ideal period for extracting the winter wheat information could be determined during wheat period of elongation,and the method of pixel unmixing was optimized.The optimized model of end members was nudation-winter wheat-woodland-water model.The distribution of winter wheat in Jinnan region from 2000 to 2014 was extracted using the optimized method of pixel unmixing.The results were revised by combining the actual statistics,and the percentage of counties with a relative error of less than 15% was 92.41% after revising.Then,according to the extracted results,the variation of winter wheat in Jinnan region from 2000 to 2014 was that the area of winter wheat in Jinnan region was overall declining from 2000 to 2014,and largest reduction was in Changzhi.On the other hand,the land use change and the core regions of winter wheat in Jinnan region also could be obtained.However,the change of agricultural land use was influenced by many factors such as crop rotation,price fluctuation,water limitation,and so on.This made it difficult to evaluate the change of winter wheat land use only by comparison of agricultural land use for any two independent years.In this study,

关 键 词：冬小麦面积 MODIS数据 混合像元分解法 植被归一化指数 

分 类 号：S512.11[农业科学—作物学]