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地面观测和遥感模拟作为陆地生态系统蒸散发研究的2种基本手段,有着各自的优缺点且存在互补性。因此,有效地将遥感和地面观测站点资料相结合,探讨陆地生态系统蒸散发的时空分布规律及不同尺度转换理论与方法,实现蒸散耗水地面观测结果的尺度扩展和生态需水量估算成为普遍关注的焦点。从遥感与地面观测结合确定陆地生态系统蒸散发入手,论述目前基于该思路的4个方面的进展:①简单经验回归模型;②能量平衡余项法;③陆面过程模式;④陆面数据同化。并探讨遥感结合地面观测估算陆地生态系统蒸散发存在的问题及可能的解决途径。
Ground observation and remote sensing simulation as the two basic means of evapotranspiration research on terrestrial ecosystems have their own advantages and disadvantages and complementarity. Therefore, it is a common concern to effectively combine the remote sensing and surface observation data to explore the temporal and spatial distribution of evapotranspiration of terrestrial ecosystems and the theories and methods of different scales of conversion, and to achieve the scaling-up of surface observations of evapotranspiration and water consumption and ecological water requirement Focus. From the combination of remote sensing and ground observation, the thesis discusses the evapotranspiration of terrestrial ecosystems and discusses the four progresses currently based on this idea: ① simple empirical regression model; ② energy balance residual method; ③ land surface process model; ④ land surface data assimilation . And discusses the problems existing in evapotranspiration of terrestrial ecosystems and possible solutions through remote sensing and ground observation.