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- Title
WATER REPELLENCY IN MARITSA-IZTOK OPEN CAST COAL MINE SOILS IN BULGARIA.
- Authors
Ivanov, Plamen; Kirilov, Ivaylo; Banov, Martin; Hristov, Biser; Shishkov, Toma; Atanassova, Irena
- Abstract
The study presents assessment of water repellency (WR) in non-humus reclaimed mine soils from the region of Maritsa-Iztok Mines, Bulgaria. Soil samples from two experimental plots (under black pine and without vegetation), from depths 0-5 (10) cm and 10-20 cm, in different seasons (spring and summer) were studied. Soil water repellency (SWR) was assessed by water drop penetration time (WDPT) before and after laboratory heating at 65°C. Variation in WDPT of soil samples in both seasons was established before heating. The longest time was measured in April at the non-vegetated site. At the pine-vegetated site, these values are lower, but are typical for most of the samples. After heating, a decrease of WDPT at both sites was observed. Sub-surface samples show similar fluctuations between seasons before heating. Unlike in spring, extremely water repellent samples were found at the pine-vegetated site in summer. Different WR is typical for most of the sampling points at the non-vegetation site. WDPT changes randomly in closer values between seasons. After heating sub-surface samples, water drop penetration time at both experimental plots also decreases. The percentage of extremely water repellent samples increases in summer. After heating, the WR partially decreases over both seasons, with sharp decline of the extreme WR in summer. We speculate that the decrease of SWR after heating is caused by conformational and/or structural and compositional changes in WR causative agents.
- Subjects
BULGARIA; MINE soils; COAL mining; WATER repellents; MARITSA Iztok Mines EAD; SOIL sampling; SOIL composition
- Publication
Silva Balcanica, 2019, Vol 20, Issue 1, p53
- ISSN
1311-8706
- Publication type
Article
- DOI
10.6084/m9.figshare.8234381