Restoration of the Soil and Vegetation in Sandy Land with Different Stages of Deflation

The aim of this work is to reveal the features of fallow sandy lands with different stages of deflation. The virgin soil-vegetation cover was the reference point: plots with light and strong deflation were compared with it. The soil deflation stages were determined by the presence or absence of layers characteristic of the backgroundsoils of the territory. The restoration of vegetation depends on the activity of wind erosion, the properties of the soils and substrata emerging on the soil surface. Studies have shown that the soil properties of deflated plots contradict the background and classical schemes of fallow land recovery. Keywords: Trasbaikalia, Barguzin Depression, sandy lands, plant-soil cover, soil deflation, vegetation restoratio

Restoration of the Soil and Vegetation in Sandy Land with Different Stages of Deflation

The aim of this work is to reveal the features of fallow sandy lands with different stages of deflation. The virgin soil-vegetation cover was the reference point: plots with light and strong deflation were compared with it. The soil deflation stages were determined by the presence or absence of layers characteristic of the backgroundsoils of the territory. The restoration of vegetation depends on the activity of wind erosion, the properties of the soils and substrata emerging on the soil surface. Studies have shown that the soil properties of deflated plots contradict the background and classical schemes of fallow land recovery. Keywords: Trasbaikalia, Barguzin Depression, sandy lands, plant-soil cover, soil deflation, vegetation restoratio

THE ROLE OF THE DEMUTATIONAL PROCESSES IN THE TRANSFORMATION OF THE PLANT-SOIL COVER OF THE FALLOW LAND IN BAIKAL BASIN

In the article the features of demutational processes in fallow lands are considered on the example of key plots with soils of light granulometric composition in Transbaikalia. There is a «failure » of the classical scheme for the restoration of fallow land on alkaline sands. There is a development of biological crusts, which prepare the substrate for the settlement of higher vegetation. A record decrease in the humus and fine earth content (particles less than 0,05 mm in diameter) is noted in the surface horizons of the fallow land, which is 0,45 % in the Barguzin basin and 0,38 % in Ust-Kiran. During the process of restoration, in Ust-Kiran key plot, the stage of weedy and annual species of polynyas and motley grass has already been passed, and at present the vegetative composition is represented by a small mosaic of mono-dominant parcels. In the «Upper Kuitun» key plot, overgrowing of deposits by higher vegetation is prevented by the moss-lichen cover formed on the soil surface. The process of so-called «soil sequestration», which discovered in the ecosystems of this site, not only leads to a special type of degradation of pasture vegetation, but contributes to the depletion of its water potential.Исследования выполнены в рамках темы № АААА–А17–117011810038–7, а также при финансовой поддержке гранта РФФИ № 17-29-05019