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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2022, Vol. 19, No. 2, pp. 155-168

Estimation of green forage distribution in reindeer pastures using satellite imagery of different spatial resolution

V.V. Елсаков 1 , S.M. Zuev 2 , T.A. Mylnikova 1 
1 Institute of Biology, Komi Science Centre UrB RAS, Syktyvkar, Russia
2 Scientific Center for Arctic Studies, Salekhard, Russia
Accepted: 26.04.2022
DOI: 10.21046/2070-7401-2022-19-2-155-168
Satellite images of different spatial resolution in combination with field surveys were used for modeling the spatial and temporal distribution of green forage biomass on the fence reindeer herding area (7.48 thousand ha) in Tazovsky District of Yamal-Nenets Autonomous Region. Reducing the image resolution (from 10 m for Sentinel-2 to 250 m for MODIS) significantly changed the structure of the stock distribution profile (the narrowing of low and high values in the mixing pixels to diapasons of average values). We observed a significant correlation between the models (Pearson’s correlation is 0.60; Spearman’s is 0.53, n = 850, p < 0.001) at the level of equally sized pixels (Sentinel generalized to MODIS). The greatest differences in the low and high values were noted for the Sentinel data set. Stock characteristics showed a higher degree of convergence (r2 = 0.92; n = 65, p < 0.001) between models for averaged data of individual economic-geobotanical contours. The MODIS data model was extrapolated to all tundra zone pastures. Herbaceous communities formed in the place of downed lakes (hasyrey) were differentiated by the time of their formation with a comparison of Landsat images of different years (1973–2014). The possibility of artificial extension of summer grazing areas was noted by the drainage of lakes cascades. Plots with downed lakes formed from 16.1 % (according to MODIS) to 20.0 % (Sentinel) of the total gross stock of green forage having a total area of 11.1 % of the coverage. The average values of the stock of green forage of hasyrey plots were varying from 10.2 to 15.4 quintal per hectare. The calculated indicators of vegetation resources distribution and reindeer capacity can be involved in the correction of intensity of traditional land use to change the environment.
Keywords: vegetation green forage, biomass modeling, Tazovsky District of Yamal-Nenets Autonomous Region, remote sensing methods, MODIS and Sentinel images, thermokarst lakes
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