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[HCG22-03] The Variation and Factors of Plant Phenology in Mongolia
Keywords:Mongolia, plant phenology, grassland vegetation
In this paper attempts to describe seasonal and interannual changes of phenology and its factors in grassland vegetation in Mongolia using observation data and remote sensing method. The observation has been made at Natural Environmental Monitoring Stations (NEMS) operated by Institute of Meteorology and Hydrology (IMH), Mongolia.
Observational data on grassland vegetation reveal that there are large interannual and spatial variation in vegetation phenology. The difference between maximum and minimum reaches 60 days in emergence date. There is different spatial distribution in each phenological stages depending on the year. Phenology has close relationship to soil moisture. Soil moisture status in ear1y growing stage determine the timing of emergence, and soil moisture after emergence affects the amount of biomass. The increase in the length of growing season does not directly connect to the increase in biomass, and the most important factor for increasing biomass amount is the timing of increasing soil moisture. And also we attempt to estimate the start of growing season (SOS) using SPOT/VEGETATION data. This is one of a satellite image dataset and the spatial resolution is around 1km * 1km. We calculate several vegetation indices and try to find the best way to estimate SOS for all grassland type in Mongolian vegetation. It can help to manage to maintain the nomadic grassland condition in the future.