Hydrophobicity (water repellency) have negative impact on soil structure, plant growth and production. The knowledge on soil hydrophobic properties is important for proper amelioration of water repellent soils. A monitoring study on hydrophobicity level, microbiological indicators and the realtionships between them in a coal ash reclaimed Technosol under different vegetation cover (pine trees, acacia trees and stubble) was performed. It was found that the surface layers possessed extreme or severe hydrophobicity and below 30 cm depth the soil was slightly hydrophobic. The structure of microbial population changed depending on vegetation. Oligotrophic microorganisms dominated in soils under trees and fungi prevailed in the soil under stubble. The soil under pine trees had the highest microbial parameters. Soil hydrophobicity level was very highly positively correlated with the amount of fungi in both areas under tree vegetation. Under stubble, negative correlation of WDPT with fungi and cellulolytic microorganisms was found. Relations with basal respiration and microbial biomass carbon were weak.
- I. D. Atanassova, B. Hristov, T. Shishkov, S. Doerr. Lipid biomarkers and their environmental significance in mine soils from Eastern Europe. Arch Agron Soil Sci., 63(12), 1697-1710, (2017).
- I. D. Atanassova, M. Banov, T. Shiskov, Z. Petkova, B. Hristov, P. Ivanov, E. Markov, I. Kirilov, M. Harizanova. Relationships between Soil Water Repellency, Physical and Chemical Properties in Hydrophobic Technogenic Soils from the Region of Maritza-Iztok Coal Mine in Bulgaria. Bulg J Agric Sci., 24, Suppl. 2, 10-17, (2018).
- I. D. Atanassova, M. Harizanova, M. Banov. Free Lipid Biomarkers in Anthropogenic Soils, in: Soil Health Restoration and Management, Springer, Singapore, 321-355, (2020).
- I. D. Atanassova, S. H. Doerr, G. L. Mills. Hot-water-soluble organic compounds related to hydrophobicity in sandy soils, in: Soil carbon. Springer, Cham. 137-146, (2014).
- B. Li, A. R. Pales, H. M. Clifford, S. Kupis, S. Hennessy, W. Z. Liang, S. Moysey, B. Powell, K.T. Finneran, C. J. G. Darnault. Preferential flow in the vadose zone and interface dynamics: Impact of microbial exudates. J Hydrol, 558, 72-89, (2018).
- S. H. Doerr, R. A. Shakesby, R. Walsh. Soil water repellency: its causes, characteristics and hydrogeomorphological significance. Earth-Sci Rev., 51(1-4), 33-65, (2000).
- E. Lozano, F. García-Orenes, G. Bárcenas-Moreno, P. Jiménez-Pinilla, J. Mataix-Solera, V. Arcenegui, J. Mataix-Beneyto. Relationships between soil water repellency and microbial community composition under different plant species in a Mediterranean semiarid forest. J Hydrol Hydromech., 62(2), 101- 107, (2014).
- E. S. Vogelmann, J. M. Reichert, J. Prevedello, G. O. Awe, D. J. Reinert. Soil hydrophobicity: comparative study of usual determination methods. Ciênc. Rural, 45(2), 260-266, (2015).
- L. F. De Bano. Water repellency in soils: a historical overview, J Hydrol., 231, 4-32, (2000).
- V. L. Morales, J. Y. Parlange, T. S. Steenhuis. Are preferential flow paths perpetuated by microbial activity in the soil matrix? A review. J Hydrol., 393(1-2), 29-36, (2010)
- S. H. Doerr, C. J. Ritsema, L. W. Dekker, D. F. Scott, D. Carter. Water repellence of soils: new insights and emerging research needs. Hydrol. Process., 21(17), 2223-2228, (2007).
- E. Lozano, P. Jiménez-Pinilla, J. Mataix-Solera, V. Arcenegui, G. M. Bárcenas, J. A. González-Pérez, F. Garcia- Orenes, M.P. Torres, J. Mataix-Beneyto. Biological and chemical factors controlling the patchy distribution of soil water repellency among plant species in a Mediterranean semiarid forest. Geoderma, 207, 212-220, (2013).
- W. Zheng, E. K. Morris, A. Lehmann, M. C.Rillig. Interplay of soil water repellency, soil aggregation and organic carbon. A meta-analysis. Geoderma, 283, 39-47, (2016).
- IUSS Working Group WRB, International Soil Classification System for Naming Soil and Creating Legends for Soil Maps. World Soil Resources Reports N 106, FAO, Rome, (2015).
- V. Grudeva, P. Moncheva, S. Nedeva, B. Gocheva, S. Antonova-Nedeva, S. Naumova. Handbook of microbiology, Sofia, St. Kl. Ohridski University edition, (2007).
- K. Alef, P. Nannipieri. Soil respiration, in: Methods in Applied Soil Microbiology and Biochemistry. London, Academic Press, 214-218, (1995).
- J. Anderson, K. Domsh. A Physiological Method for the Quantative Measurement of Microbial Biomass in Soils, Soil Biol. Biochem., 10, 215-221, (1978).
- L. W. Dekker, C. J. Ritsema. Variation in water content and wetting patterns in Dutch water repellent peaty clay and clayey peat soils. Catena, 28(1-2), 89-105, (1996).
- H. H. Gerke, E. Hangen, W. Schaaf, R. F. Hüttl. Spatial variability of potential water repellency in a lignitic mine soil afforested with Pinus nigra. Geoderma, 102 (3), 255-274, (2001).
- P. Ivanov, I. Kirilov, M. Banov, B. Hristov, T. Shishkov, I. Atanassova. Water repellency in Maritsa-Iztok open cast coal mine soils in Bulgaria. Silva Balcanica, 20 (1), 53-64, (2019).
- P. Baldrian, J. Trogl, J. Frouz, J. Snajdr, V. Valaskova, V. Merahutova, T. Cajthaml, J. Herinkova. Enzyme activities and microbial biomass in topsoil layer during spontaneous succession in spoil heaps after brown coal mining, Soil Biol. Biochem., 40, 2107– 2115, (2008).
- K. Nedyalkova, G. Petkova, I. Atanassova, M. Banov, P. Ivanov. Microbiological properties of hydrophobic and hydrophilic Technosols from the region of Maritsa-Iztok coal mines. C. R. Acad. Bulg. Sci. 71, 577-585, (2018).
- M.C. Rillig. A connection between fungal hydrophobins and soil water repellency. Pedobiologia, 49, 395–399, (2005).