摘要
利用遥感数据和大量同期地面实测数据建立基于不同草地类型、多种植被指数的植被覆盖度估算模型,对研究区2017-2018年各草地类型覆盖度从空间上进行反演、并分为五级进行评价,直观反映了各草地类型内部覆盖度高低情况。结果表明,温性草原类和高寒草原类对NDVI的敏感性强,山地草甸类和高寒草甸类对EVI的敏感性强。三江源区属低植被覆盖区,整体呈现出自东南向西北覆盖度逐渐降低的趋势。不同草地类型覆盖度由高到底为:温性草原类>高寒草甸类>高寒草原类>山地草甸类。分级显示高植被覆盖面积比例最大的是温性草原类,低植被覆盖面积比例最大的是山地草甸类。
By using the NDVI and EVI data,and combined with the data of field survey data in the same period,a remote sensing coverage estimation model was established based on multiple vegetation indexes of different grassland types.The coverage of multi grassland types are divided into five grades for evaluation,it intuitively reflects the internal classification of each grassland type.Warm steppe and cold steppe are strongly sensitive to NDVI,but mountain meadow and alpine meadow are obviously sensitive to EVI.The Three-River source region belongs to low vegetation coverage zone.Furthermore the vegetation coverage in the Three-River source region shows a trend of gradual increase from northwest to southeast.The vegetation coverage of the different grassland types in the study area decrease gradually in the following order:temperate grassland,alpine meadow,alpine grassland and mountain meadow.In these multiple grasslands,the large proportion of high vegetation coverage area is temperate grassland,while the large proportion of low vegetation coverage area is mountain meadow.
作者
井梅秀
蔡福
王学江
赵小娟
苏妍
JING Meixiu;CAI Fu;WANG Xuejiang;ZHAO Xiaojuan;SU Yan(Institute of Atmospheric Environment,China Meteorological Administration,Shenyang 110166,China;Center of Agriculture and Husbandry Remote Sensing of Qinghai Province,Xining 810008,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2020年第2期141-147,共7页
Journal of Arid Land Resources and Environment
基金
中国气象局沈阳大气环境研究所2018年开放基金课题:基于MODIS数据的青海省农牧区草畜平衡监测及评估研究资助.
关键词
植被覆盖度
敏感程度
遥感反演
分级评价
三江源区
vegetation coverage
sensitivity
remote sensing inversion
classification evaluation
the Three-River source area
