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. 4, pp. 168-180

Optical-microwave diagnostics of agricultural land afforestation

A.V. Dmitriev 1 , T.N. Chimitdorzhiev 1 , S.I. Dobrynin 1 , O.A. Khudaiberdieva 1 , I.I. Kirbizhekova 1 
1 Institute of Physical Materials Science SB RAS, Ulan-Ude, Russia
Accepted: 26.07.2022
DOI: 10.21046/2070-7401-2022-19-4-168-180
A method for comprehensive assessment of pine forest afforestation at abandoned agricultural fields is proposed in the context of clarifying carbon sequestration by Siberian boreal forests. The method is based on the correlation assessment between forest undergrowth biomass and the radar backscattering in L band as well as the analysis of long-term series of vegetation indices during the presence of snow cover. Data from synthetic aperture radars (SAR) ALOS 1, -2/PALSAR 1, -2, as well as 32 day composites of vegetation indices NDVI and EVI, obtained with the help of Google Earth Engine (GEE) cloud platform from multispectral optical images of Landsat-5, -7, -8 satellites were used for the research. Two areas of afforestation were considered for comparative assessment near Lake Baikal, the change of which was tracked using multi-temporal high-resolution data from the Google Earth service. A continuous increase of the radar backscattering from forest young growth for 14–15 years has been shown as a result of the conducted investigations. During this time period the total biomass of undergrowth (trunks and branches) reaches values at which further growth of trees does not affect the level of the radar backscattering, i.e. the «saturation» effect occurs. It is established that in the initial period of growth of young trees, the temporal dynamics of the backscattering intensity on cross-polarization can be described by a linear dependence (the coefficient of determination is greater than 0.9). A certain agreement was found between the dynamics of the EVI index and the radar backscattering intensity for one of the test sites, which is characterized by earlier and uniform afforestation. It is concluded that the proposed approach allows identifying the period of intense growth of forest undergrowth and can be used as a basis for forest classification in determining carbon sequestration.
Keywords: satellite radar, vegetation indices, time series analysis, afforestation
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