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Gheorghe Jigău, Anton Blidari, Natalia Borș and Ana Bîrsan

Abstract

The evolution of climate during the seventy-year cycle (1946-2016) led to the shaping, in the region, of two parallel trends of the evolution of the soil cover: a) in the sense of aridization; b) in the sense of humidification. These are due to the contouring of an alternation of drought and humid and relatively damp years in the 11-year climate cycle. According to calculations, 5 of them are humid or relatively damp and 6 are dry or relatively dry. Research shows that the climatic environment in the phase of modification leads to the simultaneous development of processes of both aridization of several spaces and hydromorphism of other. This situation shows different stability of the soil cover components in the region to climate change under natural-anthropogenic chernozem conditions. This particularity of soil development is to be taken into account both in pedological studies and in the framework of Regional Strategies and Programs for Adaptation to Climate Change.

Open access

Gheorghe Jigau, Leșanu Mihai, Bîrsan Ana, Blidari Anton, Borș Natalia, Plăcintă Nina and Cernolev Elena

Abstract

The chernozems evolution of the Carpatho-Danubian-Pontic space clearly shows two consecutive phases: climatogenic and anthropo-climatogenic. The latter is characterized by increasing agrogenic impact on soil climate. The soil cover of Carpathian-Danubian-Pontic space is the hierarchical functional system long-time product. Pedogenetic factors → pedogenetic regimes → pedogenetic processes → soil (soil cover). During Pleistocene, the chernozem pathogenesis in the region resumed 13 times, each time starting from the carbonic chernozem phase. Zonal climatic cyclicality has led to the differentiation of chernozem subtypes, determined by the zonal differentiation of pedogenic regimes and typogenetic elemental processes. The current stage of chernozem cleavage in the region began 10-12 thousand years ago. The evolution of soils in the soil was determined by the climate cyclicality and the increase of anthropogenic imputations and involves the succession over time of several phases: - Cryogenic with poorly developed soil by A (AO) - C Order; - Early dynamic halocene with developed zonal soil formation; - Late halocene with climatic evolution of the profile; - Natural-anthropogenic. During the last one, four eras were accelerated: natural-anthropo-turbian, naturalanthropic modification, natural-anthropic restructuring and natural-anthropic stagnation. Increasing the anthropogenic impulses led to the modification of the climatic → soil relations in the sense of increasing the degree of continentalisation of the soil climate materialized in the aridization of the soil cover, the change of the sense and intensity of the typogenic processes and the induction of some nontypical elementary processes of the chernozemic pedogenesis.