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


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2022, Vol. 19, No. 2, pp. 142-154

Seasonal changes in temperature in the trunks of a living tree (by the example of pine)

D.A. Romanov 1 , I.V. Ryabinin 2 , A.N. Romanov 2 
1 Novosibirsk State University, Novosibirsk, Russia
2 Institute for Water and Environmental Problems SB RAS, Barnaul, Russia
Accepted: 22.04.2022
DOI: 10.21046/2070-7401-2022-19-2-142-154
Trees are persistently exposed to various natural effects. Physiological characteristics of a tree significantly depend on its temperature. In different branches of science and technology, measuring the tree temperature is relevant and in demand. This paper presents the results of seasonal and daily temperature changes (October-April) in a trunk of a pine (Pínus) tree. To measure the temperature, TMP1075 sensors were used. Data collection from temperature sensors was carried out by means of a base station controlled by the STM32L431 microcontroller. The measurement results were recorded on a flash card and sent via an SX1278 transceiver to a receiving station with a similar unit and access to the global network. The database was organized on the receiving side. Sampling of temperature sensors was performed at one- minute intervals. We studied diurnal temperature variations on the tree surface and in its trunk in winter and spring. Radial temperature dependences in the tree trunk were approximated by a quadric polynomial. They depended on the ambient temperature and differed significantly. The temperature difference between the surface and deep layers of the tree trunk reached 12 °C. The obtained results indicate that the measured ambient temperatures can be used in calculations of temperatures in a tree trunk at different depths.
Keywords: tree, trunk, temperature, seasonal dynamics, daily dynamics
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