MERSI资料在内蒙古草原牧草产量估测中的应用研究

利用卫星遥感资料估测天然草地生产力是草地生态学和草地管理学的研究热点。内蒙古草原面积大、类型多、具有重要的生态和生产功能,实时监测其草地生产力变化十分必要。由于风云3号极轨气象卫星资料具有迅速、覆盖面广、不受地面条件限制等优点,文中将内蒙古自治区气象局42个生态监测站点2008～2010年6～8月份的风云3号卫星MERSI遥感数据和同步的牧草产量实测数据相结合,引入MERSI-NDVI概念,建立了基于MERSI-NDVI估测内蒙古草原牧草产量的估测模型,并对模型的可靠性进行了检验。结果表明:基于风云3号极轨气象卫星资料提取的MERSI-NDVI与内蒙古草原牧草产量具有较高的相关性,利用MERSI-NDVI遥感估测天然草地牧草产量是可行的;基于MERSI-NDVI构建的三个类型草地遥感估产模型精度在65.32%～88.84%之间,其精度可以满足宏观测产的要求。不仅适合大面积监测估产,还可用于局部地域牧草产量的定点估产。

The applied research on estimating the yield of forage in Inner Mongolia grasslands using MERSI Data

Estimating the productivity of forage on natural meadow is the hot spot of grassland ecology and grassland management by use of the remote sensing data.Grasslands in Inner Mongolia have large areas,many types and significant ecology and productive function.It is necessary to survey the grassland productivity in real time.The data of meteorological satellite(Fengyun-3 satellite) have the advantages of speed,large covering square and no limitation of ground condition.The concept of MERSI-NDVI was cited in this paper based on the combination of actual measurement data of forage grass production which was measured in 42 ecological monitoring units of Inner Mongol Autonomous Region at the time of June-August from 2008 to 2010 and remote sensing monitoring data of synchronous FY-3 satellite,and making estimation model based on estimating the yield of forage grass by MERSI-NDVI,then testing the reliability of the model.The results showed that MERSI/NDVI and the yield of forage grass of different grassland types showed close relation.So,estimating the yield of forage of natural meadow is viable.the precision of three types of yield model was between 65.32%~88.84%,its precision can satisfy the require of macroscopic measuring yield,which is not only suitable for monitoring and estimate the yield in large areas,and also suitable for estimating the yield form fixed point in part areas.