SIMULATION MODELING AND PRACTICAL USE OF THE HYDROLOGICAL FUNCTION OF DETRITUS IN SOIL ENGINEERING TECHNOLOGIES

Abstract

The high water retention and water capacity functions of detritus determine its potential hydrological signifi cance in the formation of the water regime of soils and phytoproductivity of forest landscapes. Using computer modeling of water exchange in the “soilplantatmosphere” HYDRUS1D system, we preliminary studied the hydrological function of detritus for water retention of precipitation and root water consumption at different amounts and variants of the arrangement of detritus layers in the soil profi le. The soil structures designed on the basis of this information for sustainable afforestation with increased carbon sequestration demonstrated in field experiments with water balance monitoring high eficiency in optimizing the water retention capacity of the soil and roots water consumption of the test crop (Glauca spruce) with a 23fold reduction in unproductive water losses and a 1.5-2fold increase in the current plant growth relative to untreated control. The physical mechanism of the detritus hydrological function is the formation of capillary barriers blocking evaporation and capillary resorption of soil water due to due to surface accumulation (forest litter) or placement in layers inside the soil (peat layers in constructosems).