Impact of a Subsurface Soil Compaction at Haplic Castanozem on the Dynamics of Soil Moisture Content and the Mean Infiltration Rate During Simulated Rainfall | Влияние на наличието на уплътнен слой под почвената повърхност при Карбонатен чернозем върху динамиката на почвената влажност и средната скорост на инфилтрация по време на моделен дъжд
2011
Lozanova, L., N. Pushkarov Institute of Soil Science, Sofia (Bulgaria)
It is well known that the formation and nature of water erosion processes are essential to soil infiltration capacity, which in turn, apart from baseline characteristics and soil moisture, also depends on the presence of compacted layer below the soil surface. In the present study, an attempt has been made to study the process of wetting the soil layer 0-40 cm by measuring the matrix potential of soil moisture, in the absence and presence of subsurface compacted layer 10-30 cm. Within a series of experiments with simulated rainfall on Haplic Kastanozem with no vegetation cover, mercury tensiometers were placed at four depths 10, 20, 30 and 40 cm, which readings were taken during the rainfall at intervals of 2, respectively 5 minutes. The experiments included simulated rainfalls with four levels of intensity about 0.3, 0.5, 1 and 2 mm/min) at the lower part of northeast slope with a gradient of 70. Applied water amount ~ 150 l was supplied in three equal portions within 25 hours, with each one of the rain intensities. Conclusions are drawn about the influence of the rain intensity and antecedent soil moisture on the infiltration process in the presence and absence of subsurface soil compaction
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