Most studies on permafrost soils have been conducted in the

However, neither the number of rainy events above certain high thresholds, nor the amount of rain fallen during these events has exceeded those observed during the 1950s and 1960s, before the dry period. Thus macronutrients cannot explain the increase in runoff observed since the beginning of the drought, unless determining that the relative decrease of number and rainfall amount in small events should affect the vegetation cover?
Table 2 gives, for the few years where all data are available and accounting the catchment area (27,050 km2), the runoff coefficient of this area of “small koris”.