- V. Diamantis (1)
- S.H. Doerr (8)
- P. Douglas (2)
- H.G.M. Elsen van den (1)
- A.J.D. Ferreira (2)
- E. Gazani (1)
- C. Haskins (2)
- L. Johnsey (2)
- J.J. Keizer (1)
- M. LeBlanc (1)
- P. Li (1)
- C.T. Llewellyn (2)
- K.A. Mainwaring (2)
- C.P. Morley (2)
- L. Pagorogon (1)
- J.Y. Parlange (1)
- F. Pliakas (1)
- C.J. Ritsema (8)
- G. Rooij de (1)
- D.F. Scott (1)
- R.A. Shakesby (1)
- F. Stagnitti (3)
- M.M. Steenhuis (1)
- N. Turoczy (1)
- X. Xiong (1)
- A.K. Ziogas (2)
Use of olive mill wastewater (OMW) to decrease hydrophobicity in sandy soil
Diamantis, V. ; Pagorogon, L. ; Gazani, E. ; Doerr, S.H. ; Pliakas, F. ; Ritsema, C.J. - \ 2013
Ecological Engineering 58 (2013). - ISSN 0925-8574 - p. 393 - 398.
biosurfactant production - microbial surfactants - aggregate stability - repellency - wastewaters - amelioration - degradation
This study explores the potential effectiveness of olive mill wastewater (OMW) as an alternative to industrial surfactants in decreasing hydrophobicity in sandy soil. The OMW was obtained from a storage lagoon and characterized by high concentrations of short-chain fatty acids, mainly butyric, propionic and acetic, which contributed approximately to 1/3 of the wastewater organic load. It was applied diluted with freshwater (1:1) in an agricultural field in Greece affected by water repellency at a rate of 4 L/m2. OMW was found to be effective in decreasing soil water repellency, which suggests the potential of OMW to be used as a natural surfactant. The decrease in hydrophobicity was attributed to the fatty-acid related surface-active properties, enabling rapid penetration of OMW into the soil matrix, and the consequent enhancement of soil microbial activity that enables degradation of soil hydrophobic compounds.
The Water Reuse project: Sustainable waste water re-use technologies for irrigated land in NIS and southern Europe states; project overview and first results
Elsen, H.G.M. van den; Doerr, S.H. ; Ritsema, C.J. - \ 2008
Editorial: Water repellence of soils: new insights and emerging research needs
Doerr, S.H. ; Ritsema, C.J. ; Dekker, L.W. ; Scott, D.F. ; Carter, D. - \ 2007
Hydrological Processes 21 (2007)17. - ISSN 0885-6087 - p. 2223 - 2228.
hydrophobicity - portugal - rainfall - dynamics - impact - flow
An increasing awareness of the occurrence and implications of soil water repellence has caused a surge in research activity addressing this phenomenon in recent years. This has involved not only the disciplines of hydrology, soil, and related environmental sciences, but increasingly also biology, chemistry, physics, and surface sciences, which has allowed elucidation of the causes and behaviour of soil water repellence based on first order principles. Furthermore, novel approaches and advances in technology have allowed examination of its causes and implications at increasingly coarse and fine spatial and temporal scales. The 19 papers presented in this special issue exemplify this trend by bringing together studies from diverse disciplines and presenting the latest advances regarding the origin, occurrence, controls, hydrological effects, and amelioration of soil water repellence. Here we aim to summarize, evaluate and set into context some of the new insights arising from these studies and also attempt to identify the key current and likely future research gaps related to water repellence in soils
Occurrence, prediction and hydrological effects of water repellency amongst major soil and land-use types in a humid temperate climate
Doerr, S.H. ; Shakesby, R.A. ; Dekker, L.W. ; Ritsema, C.J. - \ 2006
European Journal of Soil Science 57 (2006)5. - ISSN 1351-0754 - p. 741 - 754.
sandy soils - wetting patterns - organic-matter - dutch coast - variability - moisture - parameter - portugal - rainfall - runoff
Knowledge of soil water repellency distribution, of factors affecting its occurrence and of its hydrological effects stems primarily from regions with a distinct dry season, whereas comparatively little is known about its occurrence in humid temperate regions such as typified by the UK. To address this research gap, we have examined: (i) water repellency persistence (determined by the water drop penetration time method, WDPT) and degree (determined by the critical surface tension method, CST) for soil samples (0¿5, 10¿15 and 20¿25 cm depth) taken from 41 common soil and land-use types in the humid temperate climate of the UK; (ii) the supposed relationship of soil moisture, textural composition and organic matter content with sample repellency; and (iii) the bulk wetting behaviour of undisturbed surface core samples (0¿5 cm depth) over a period of up to 1 week. Repellency was found in surface samples of all major soil textural types amongst most permanently vegetated sites, whereas tilled sites were virtually unaffected. Repellency levels reached those of the most severely affected areas elsewhere in the world, decreased in persistence and degree with depth and showed no consistent relationship with soil textural characteristics, organic matter or soil moisture contents, except that above a water content of c. 28% by volume, repellency was absent. Wetting rate assessments of 100 cm3 intact soil cores using continuous water contact (¿20 mm pressure head) over a period of up to 7 days showed that across the whole sample range and irrespective of texture, severe to extreme repellency persistence consistently reduced the maximum water content at any given time to well below that of wettable soils. For slightly to moderately repellent soils the results were more variable and thus hydrological effects of such repellency levels are more difficult to predict. The results imply that: (i) repellency is common for many land-use types with permanent vegetation cover in humid temperate climates irrespective of soil texture; (ii) supposedly influential parameters (texture, organic matter, specific water content) are poor general predictors of water repellency, whereas land use and the moisture content below which repellency can occur seem more reliable; and (iii) infiltration and water storage capacity of very repellent soils are considerably less than for comparable wettable soils.
|Water movement in hydrophobic soils
Doerr, S.H. ; Ritsema, C.J. - \ 2005
In: Encyclopedia of hydrological sciences. Vol. 2 / Anderson, M.G., McDonnell, J.J., Chichester (UK) [etc.] : Wiley - ISBN 0471491039 - p. 1027 - 1040.
|Organic compounds associated with water repellency in sandy soils
Doerr, S.H. ; Douglas, P. ; Morley, C.P. ; Llewellyn, C.T. ; Mainwaring, K.A. ; Haskins, C. ; Johnsey, L. ; Ritsema, C.J. ; Stagnitti, F. ; Ferreira, A.J.D. ; Ziogas, A.K. - \ 2005
In: Soil abiotic and biotic interactions and impact on the ecosystem and human welfare / Huang, P.M., Violante, A., Bollag, J.M., Vityakon, P., Enfield NH (USA) : Science Publishers - ISBN 1578083443
Extraction of compounds associated with water repellency in sandy soils of different origin
Doerr, S.H. ; Llewellyn, C.T. ; Douglas, P. ; Morley, C.P. ; Mainwaring, K.A. ; Haskins, C. ; Johnsey, L. ; Ritsema, C.J. ; Stagnitti, F. ; Allinson, G. ; Ferreira, A.J.D. ; Keizer, J.J. ; Ziogas, A.K. ; Diamantis, J. - \ 2005
Australian Journal of Soil Research 43 (2005)3. - ISSN 0004-9573 - p. 225 - 237.
organic-matter - hydrophobicity - variability - substances - severity
After an initial evaluation of several solvents, the efficiency of Soxhlet extractions with isopropanol/ammonia (s.g. 0.88) (70 : 30 v : v; 24 h) in extracting compounds associated with water repellency in sandy soils was examined using a range of repellent and wettable control soils (n = 15 and 4) from Australia, Greece, Portugal, The Netherlands, and the UK. Extraction efficiency and the role of the extracts in causing soil water repellency was examined by determining extract mass, sample organic carbon content and water repellency (after drying at 20°C and 105°C) pre- and post-extraction, and amounts of aliphatic C¿H removed using DRIFT, and by assessing the ability of extracts to cause repellency in acid-washed sand (AWS). Key findings are: (i) none of organic carbon content, amount of aliphatic C¿H, or amount of material extracted give any significant correlation with repellency for this diverse range of soils; (ii) sample drying at 105°C is not necessarily useful before extraction, but may provide additional information on extraction effectiveness when used after extraction; (iii) the extraction removed repellency completely from 13 of the 15 repellent samples; (iv) extracts from all repellent and wettable control soils were capable of inducing repellency in AWS. The findings suggest that compounds responsible for repellency represent only a fraction of the extract composition and that their presence does not necessarily always cause repellency.
Effects of clay amendment on adsorption and desorption of copper in water repellent soils
Xiong, X. ; Stagnitti, F. ; Allinson, G. ; Turoczy, N. ; Li, P. ; LeBlanc, M. ; Cann, M.A. ; Doerr, S.H. ; Steenhuis, M.M. ; Parlange, J.Y. ; Rooij, G. de; Ritsema, C.J. ; Dekker, L.W. - \ 2005
Australian Journal of Soil Research 43 (2005)3. - ISSN 0004-9573 - p. 397 - 402.
heavy-metals - sorption characteristics - cadmium - zinc
Copper is an important micronutrient and trace amounts are essential for crop growth. However, high concentrations of copper will produce toxic effects. Australia is increasingly developing production of crops in water repellent soils. Clay amendment, a common amelioration techniques used in Australia, has demonstrated agronomic benefits in increased crop or pasture production. The sorption and desorption of copper and the effect of clay treatment on copper behaviour in a water repellent soil collected from an experimental farm in South Australia is studied. We found that the water repellent soils amended with clay have an increased adsorption capacity of copper. Also the clay-amended soils had an increased ratio of specific sorption to total sorption of copper. The implications of this study to the sustainable agro-environmental management of water repellent soils is discussed