基于MODIS-NDVI的通辽市植被遥感动态监测

Remote Sensing Dynamic Monitoring of Vegetation in Tongliao City Based on MODISNDVI

利用2003—2017年MODIS-NDVI遥感资料,对内蒙古通辽市21世纪开始实施“三北”防护林、退耕还林还草、“双千万亩”综合治理等一系列生态建设工程以来,植被变化情况进行了动态监测评估。结果表明,受到全球气候变暖及植被生长季变长等因素的影响,通辽市植被总体呈增加趋势,植被指数(NDVI)年平均值从2003年的0.2961上升至2017年的0.3227;同时植被覆盖结构改善明显,低植被覆盖向中植被覆盖转变。2003—2017年,扎鲁特旗植被指数较为平稳,保持较高水平。从植被指数变化来看,开鲁县、科尔沁左翼中旗一带及科尔沁左翼后旗中东部地区改善较为明显。

Based on the MODIS-NDVI remote sensing data from 2003 to 2017, the vegetation changes of Tongliao City have been dynamically monitored and evaluated since the implementation of a series of ecological construction projects such as the Three-North Shelter Forest Program, Conversion of Cropland to Forest and Grassland Program and Comprehensive Management Program of ′Double Million Mu′ at the start of 21st century. The results showed that the vegetation in Tongliao City generally expressed an increasing trend due to the global warming and the extension of growing season of vegetation, and the annual average of NDVI was elevated from 0.296 1 in 2003 to 0.322 7 in 2017. At the same time, the vegetation cover structure was improved obviously, and the low vegetation cover had been changing into the middle vegetation cover. The NDVI of Jarud Banner was relatively stable and maintained a high level from 2003 to 2017. From the aspect of NDVI changing, the vegetation cover in Kailu County, the certain areas of Horqin Zuoyi Middle Banner and the central and eastern region of Horqin Zuoyi Rear Banner was improved more obvious.