ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 3, pp. 206-214

Study of NDVI trends and vegetation phenological parameters in permafrost region of Siberia by satellite observations

E.V. Varlamova 1 , V.S. Solovyev 1 
1 Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB RAS, Yakutsk, Russia
Accepted: 29.03.2017
DOI: 10.21046/2070-7401-2017-14-3-206-214
A study of NDVI spatio-temporal changes and vegetation phenological parameters in permafrost region of Siberia (on example of Yakutia) was carried out using AVHRR/NOAA data (1982–2014). The maps of the NDVI trends and meteorological parameters (annual air temperature, precipitation) were created. Maps of NDVI correlation with air temperature and precipitation were also compiled. To study phenological parameters, two sites with tundra vegetation in northern Yakutia and one site with deciduous needleleaf forests in central part of Yakutia were selected. The sites are characterized by homogeneous type of vegetation, lowland and similar (within one natural area) climatic parameters. A method based on stable transition of air temperature through +5 °C was used to estimate the beginning, the end and the length of the growing season for selected sites. Over the past three decades, a positive NDVI trend is observed in the whole of Eastern Siberia, except for some small areas. Positive relations between the NDVI and air temperature in study areas are observed. The correlation of NDVI and precipitation was not established. During the study period, the length of the growing season (LOS) increased in all sites. The LOS of deciduous needleleaf forests increases mainly due to earlier start of the growing season. The LOS of tundra vegetation increases due to earlier start and later end of the growing season as well. Air temperature is more important than precipitation among the factors significantly influencing vegetation variations in the permafrost region of Siberia.
Keywords: NDVI, phenological parameters, growing season, permafrost region, Eastern Siberia, AVHRR
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