HR: 1340h
AN: GC23A-0976    [Abstracts]
TI: Dynamics of soil moisture and actual evaporation over the East-European Plain during the second part of the 20th century
AU: * Speranskaya, N
EM: speran@mail.rcom.ru
AF: State Hydrological Institute, #23, 2nd line, St. Petersburg, 199053, Russian Federation
AU: Bohn, T
EM: tbohn@hydro.washington.edu
AF: University of Washington, Box 352700, Seattle, WA 98195-2, United States
AB: During the second part of the 20th century more important elements of the soil water balance exhibited significant changes over the Great Russian Plain. Soil moisture increasing was observed practically in all natural zones. In the past 10-15 years soil moisture values exceeded the level of the field capacity at some stations. Moreover, maximal soil moisture increasing was fixed during the summer-autumn period. Winter water content increased as well, especially in the forest zone. Only in the dry steppe zone soil moisture growth was observed in the winter-spring season. It should be also noted that the most intensive changes in the soil water content were fixed within the transition zones and especially in the steppe zone. These changes in the soil water regime inevitably affect the regime of evaporation from the soil surface. Actual evaporation increased in all natural zones except the dry steppe zone. In this zone actual evaporation decrease was fixed. Similar soil moisture, the most intensive actual evaporation changes were observed within the transition zones and especially in the dry steppe zone. Despite evaporation increasing, soil overmoistening affects the agrophysical soil properties. Processes of chernozems' leaching, bogging and desertification of soil settled into critical phase. During the past 45-50 years soil's salinification and gleying are well defined. Soil degradation is sometimes of irreversible character.
DE: 1637 Regional climate change
DE: 1655 Water cycles (1836)
SC: Global Environmental Change [GC]
MN: 2007 Fall Meeting