ИСТИНА

The task of assessing the local carbon balance of green infrastructure elements, which is relevant in the context of the ESG green agenda, can be successfully solved on the basis of modern programmable loggers with NDIR technology for detecting CO2 in the air. The main idea of fully automated monitoring of carbon gas exchange consists in periodic pumping of atmospheric air through closed chambers for soil and vegetation, followed by a brief exposure to assess trends in growth (CO2 emission) or sink (photosynthesis) of carbon dioxide with CO2 loggers built into the chamber. This know-how was implemented at the experimental sites of the Serebryanoborsky Experimental forestry of ILAN RAS in Moscow on the example of planting blue spruce (Picea pungens Engelm.) on sod-podzolic sandy loam soil and soil structures with natural (peat) and synthetic (composite hydrogels) soil modifiers. Budget gas analyzers PS-3208 (PASCO, USA) and HT-401/5 (HTi, China) were used as CO2 loggers. The monitoring results revealed strong changes in the plant and soil components of C-gas exchange with repeated changes in the local carbon balance from source to sink throughout the year. The cold period plays an important role in the annual C-balance. For evergreen coniferous plantations in the cold period from November to March, carbon runoff can reach 20% due to periodic thaws that stimulate photosynthesis. Emission C-losses in the cold period can reach 30%, not stopping completely even in severe (20-30 ° C) frosts. Temperature is the most significant controlling factor of the C-balance with a contribution to its dynamics of at least 50-70%.