Spatial and seasonal variability of the nutritive regime of Al-Fe-humus podzols in boreal forests

The nutritive regime of soil under boreal forests is studied on the example of Al-Fe-humus podzols. The spatial heterogeneity and seasonal variability of available nutrients are examined. The factors of spatial heterogeneity of the nutritive regime are specified and the role of stands is estimated. The upper organic horizon (forest litter) of the investigated podzols under boreal forests accumulates considerable amounts of nutrients. The developm ent of this horizon is considered as an adaptation of boreal forest ecosyst ems to the nutrient-deficient environment.