Abstract: Lightning fire is highly frequent in Northeast China. Based on the Lightning Imaging Sensor (LIS)/Optical Transient Detector (OTD) data provided by the National Aeronautics and Space Administration (NASA), and by using the regional meteorological data, DEM data, and vegetation data, this paper analyzed the spatial and temporal distribution and related affecting factors of lightning fires in Northeast China. Spatially, lightning activity was more frequent in Hulunbeier and Heihe, and lightning fire was more concentrated in Daxinganling, Hulunbeier, and Heihe. Temporally, lightning peaked in July, while lightning fire peaked in June. Therefore, the spatial distributions of lightning activity and lightning fire were generally coincided. Daxinganlin had less lightning activity but frequent lightning fire, possibly because the greater undulation of topography, easy formation of thunderstorm under effects of atmospheric circulation, and wide distribution of combustible vegetative cover. The greater differences in the temporal distribution of lightning activity and lightning fire were mainly due to the more precipitation, higher relative humidity, and smaller wind velocity in July than in June.

Key words: Lead, Cadmium, Thuidium cymbifolium, Physiological characteristics