STABILITY OF ORGANIC MATERIAL OF STERN-PODZOLIC SOILS TO THE DIFFERENT DEGREE OF EROSION DEGRADATION

Abstract

In washed and washed soils, organic compounds were mineralized twice as fast as in non-eroded soil. Water erosion increased the mineralizability of organic compounds of carbon and nitrogen. The content of active organic matter in the non-washed soil was 872 mg/kg, medium-washed - 839, strongly washed - 813 and in the washed-up - 990 mg/kg. The highest mineralization capacity with a relative content of a readily mineralizable fraction of active organic matter (29 %) is noted for soiled soil. The processes of water erosion lead to a decrease in the content of the active pool of soil organic matter in 1,04-1,07 times. There is an inverse relationship between the carbon-sequestering capacity and the mineralization capacity of soils. The capacity of sequestration of washed-out soils with increasing soil erosion was reduced. The minimum sequestering capacity was characterized by strongly washed soil in the autumn period (15,3) and the soiled soil in the spring period (12,7), maximum - unblashed soil in the spring period (21,3). The nitrogenous fund of sod-podzolic light loam soils of different degrees of erosion is closely related to the content of total organic carbon. The mineralized nitrogen pool in sod-podzolic light loamy soil is 6,7 ± 1,0 % of Nob.