Normalized Difference Vegetation Index (NDVI) is a widely used indicator of vegetation status. In this
study, Moderate Resolution Imaging Spectroradiometer (MODIS) data was used to calculate NDVI,
and then the data from NDVI combined with ground sampling are used to conduct the soil organic
carbon (SOC) and nitrogen (N) research, which analyze the SOC and N contents in the surface soil of
Huolin River Wetland in northeast China. The results show that NDVI, SOC and N are highly related,
and NDVI can be used to study C and N spatial distribution in this wetland. It also demonstrates that
herbaceous vegetation is a better indicator of wetland nutrient enrichment.
It is very important to study on lightning activities in Northeast China since it is the area of lightning fire with the highest
frequency. Spatial and temporal distributions of lightning activities were analyzed based on Lightning Imaging Sensor
(LIS)/ Optical Transient Detector (OTD) data provided by the National Aeronautics and Space Administration (NASA).
Also the reasons of lightning fire were investigated through its spatial and temporal distributions, lightning activities,
Digital Elevation Models (DEM), vegetative cover types, and meteorological factors. Results showed that there are more
lightning activities in Hulunbeier and Heihe than other places, especially in July. But lightning fire occurred mainly in
the area of Daxinganling, Hulunbeier and Heihe, and the most frequencies of lightning fire happened in June. The reason
why there were few lightning activities but a lot of lightning fire in Daxinganling could be explained by the widely distributed
combustible vegetative cover types and the mountainous areas where easily produce thunderstorm which is
affected by atmospheric circulation. Results also suggested that the peak of lightning fire in these areas is in June but the
peak of lightning activities in July. This phenomenon could be accounted for by the more precipitation in July but the
more droughts in June. Overall, these researches will shed light on the understanding of lightning fire in order to prevent,
control, or even utilize it.
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