ROLE OF WOODY PLANTS’ ECTOMYCORRHIZA IN THE DYNAMIC OF FOREST SOILS ORGANIC MATTER: SYNTHESIS AND CONCEPTUALIZATION OF AVAILABLE DATA

O. G. Chertov^1*, I. V. Priputina², V. N. Shanin^{1, 2}, P. V. Frolov²

¹ Center for Forest Ecology and Productivity of the Russian Academy of Sciences

Profsoyuznaya st., 84/32 bldg. 14, Moscow, 117997, Russian Federation

²Institute of Physical, Chemical and Biological Problems in Soil Science, Russian Academy of Sciences – separate subdivision of the Federal Research Centre

«Pushchino Research Centre of Russian Academy of Sciences»,

Russia, 142290, Moscow region, Pushchino, Institutskaya str., 2, build. 2.

^*E-mail: ochertov@rambler.ru

Received: 20.02.2024

Revised: 15.03.2024

Accepted: 24.03.2024

The main aspects of the woody plants ectomycorrhiza functioning, which affect the forest soil organic matter (SOM) formation and decomposition, are considered. Ectomycorrhiza consumes trees’ root exudates for growth with formation of a dense net of extramatrical mycelium, which has a short life span. Thanks to that, a fast turnover of mycelium biomass takes place here with formation of a big pool of belowground litter fall. Its mass is larger than a total pool of aboveground litter (leaves, confer needles, etc.). Mycelial bio- and necromass have been consumed by soil biota of different functional groups and levels of soil food webs, resulting in formation of solid-phase metabolic products. These products (excreta, casts) represent a labile nitrogen-rich pool of fresh SOM. Simultaneously, the decomposition of this labile SOM pool serves as a mechanism to return available nitrogen to plant roots in the soil. This mechanism determines an ectomycorrhizal positive effect for trees and other plants growth in forest communities. Therefore, a consideration of the effect of ectomycorrhiza on soil organic matter shall include a triad of organisms: “plant – mycorrhiza – soil biota” (including both microorganisms and soil fauna).

Keywords: forest soils, ectomycorrhiza, soil organic matter, nitrogen mining, soil fauna, faunal excretes

 

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