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Stefan H Doerr - One of the best experts on this subject based on the ideXlab platform.
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quantifying the impact of soil water Repellency on overland flow generation and erosion a new approach using rainfall simulation and wetting agent onin situ soil
Hydrological Processes, 2007Co-Authors: G Leightonboyce, Richard A Shakesby, Stefan H Doerr, R P D WalshAbstract:The conventional view of soil water Repellency is that it promotes overland flow and soil erosion, but this is not always borne out by observations. This study aimed to isolate the effects of Repellency on long-unburnt and recently burnt terrain on infiltration, overland flow and erosion at the small plot scale (0·36 m2). Rainfall simulations (30 min; intensity 100 mm h−1), using untreated water, and water treated with surfactants to eliminate Repellency, were conducted on in situ repellent soils in fire-prone Eucalyptus globulus plantations, north-central Portugal at (i) a long-unburnt site with and without litter, and (ii) a recently burnt site. On long-unburnt terrain, the mean overland flow coefficient (33%) was 16 times higher and mean slopewash was 23 times higher under repellent compared with wettable conditions. On recently burnt terrain, no overland flow was recorded under wettable conditions, while under repellent conditions the mean coefficient was 70%. The water storage capacity of the litter layer under 10-year-old eucalyptus stands for dry antecedent conditions was at least 3 mm water depth per cm litter depth, implying at least a delay to the onset of overland flow. Severe Repellency (36% ethanol) was found to persist through a 30-min storm (100 mm h−1) when a litter layer was present. A continuous wetting front was observed in the upper ∼1 cm of exposed soil, indicating a breakdown in Repellency at the time of observation. Below ∼1 cm, repellent, dry soil conditions generally persisted through the simulated storm event. A major implication is that prediction of hydrological impacts of Repellency must also take into account the infiltration characteristics of any litter layer and any non-repellent soils, if present. Copyright © 2007 John Wiley & Sons, Ltd.
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occurrence prediction and hydrological effects of water Repellency amongst major soil and land use types in a humid temperate climate
European Journal of Soil Science, 2006Co-Authors: Stefan H Doerr, Richard A Shakesby, L W Dekker, Coen J. RitsemaAbstract: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.
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effects of differing wildfire severities on soil wettability and implications for hydrological response
Journal of Hydrology, 2006Co-Authors: Stefan H Doerr, W. H. Blake, Richard A Shakesby, C.j. Chafer, Geoffrey Humphreys, P. J. WallbrinkAbstract:Abstract Fire-induced or enhanced soil water Repellency is often viewed as a key cause of the substantial increases in runoff and erosion following severe wildfires. In this study, the effects of different fire severities on soil water Repellency are examined in eucalypt forest catchments in the Sandstone Tablelands near Sydney, burnt in 2001 and 2003. At sites affected by different fire severities and in long-unburnt control sites, Repellency persistence was determined in situ and in the laboratory for surface and subsurface soil samples (n=846) using the Water Drop Penetration Time (WDPT) test. All long-unburnt samples were found to be water repellent, with severe to extreme persistence (>900 s) being dominant for surface (0–2.5 cm) and slight to moderate persistence (10–900 s) for subsurface (2.5–5 cm) soil, indicating naturally very high ‘background’ levels of Repellency. In contrast to the generation or enhancement of Repellency usually reported following forest fires of similar severity in previous studies, burning caused widespread destruction of Repellency. The mineral soil depth to which Repellency was destroyed (0.5–5 cm) was found to increase with burn severity. Below this charred wettable layer, persistence of pre-existing water Repellency increased. Two years after the fire, the frequency of extreme Repellency persistence was reduced in the surface and subsurface. However, recovery to pre-fire Repellency levels had not been achieved. The associated hydrological impacts of these fire effects are more complex than simply the enhancement of overland flow, runoff and soil erosion with increasing fire severity. For forest fires sufficiently severe to remove foliage and ground litter above already repellent soil, a more severe burn, in which there is destruction of surface soil Repellency, would result in lower runoff response compared to a burn insufficiently severe to destroy surface Repellency. During storms intense enough to saturate the wettable surface rapidly, this layer may, however, be removed by overland flow, with potentially severe implications for soil fertility and seedbed survival, post-fire ecosystem recovery, and downstream sedimentation and water quality. The results demonstrate that existing fire severity classifications are not well suited to predicting fire impacts on soil hydrological responses and highlight the need for a new fire severity evaluation scheme. A scheme encompassing not only foliage and ground cover status, but also changes to surface and subsurface soil hydrological properties, would provide a better prediction of the immediate hydrological effects of wildfires on catchments such as flash flooding and erosion, and also of their time-to-recovery than current classifications allow. Such a scheme could prove invaluable given the future increase in fire frequency and severity predicted for many regions.
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extraction of compounds associated with water Repellency in sandy soils of different origin
Soil Research, 2005Co-Authors: Stefan H Doerr, Coen J. Ritsema, C T Llewellyn, Peter Douglas, Christopher P Morley, Kathryn A Mainwaring, C Haskins, L Johnsey, Frank Stagnitti, G AllinsonAbstract: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 ◦ Ci s 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.
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water Repellency of soils the influence of ambient relative humidity
Soil Science Society of America Journal, 2002Co-Authors: Stefan H Doerr, Richard A Shakesby, L W Dekker, Coen J. Ritsema, Robert BryantAbstract:Adverse effects of soil water Repellency (hydrophobicity) are of concern during or following rainfall or irrigation, and are often preceded by conditions of high atmospheric relative humidity (RH). Assessments of Repellency are, however, commonly conducted on air-dried samples at ambient laboratory conditions. This study explores the effects of differing antecedent RHs (32-98%) on the water Repellency of air-dried soils of wide ranging characteristics under laboratory conditions using water drop penetration time (WDPT) and ethanol-percentage tests. Most samples exhibited considerably higher water Repellency after exposure (< 1 d) to 98% RH compared with lower RHs, typical of ambient laboratory conditions. This work suggests that previous studies mayhave incorrectly classified some soils, likely to exhibit water Repellency in the field, as wettable, and that tests carried out following exposure of samples to high RH provide assessments that best reflect critical field conditions.
L W Dekker - One of the best experts on this subject based on the ideXlab platform.
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occurrence prediction and hydrological effects of water Repellency amongst major soil and land use types in a humid temperate climate
European Journal of Soil Science, 2006Co-Authors: Stefan H Doerr, Richard A Shakesby, L W Dekker, Coen J. RitsemaAbstract: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.
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exponential increase of publications related to soil water Repellency
Soil Research, 2005Co-Authors: L W Dekker, K Oostindie, C.j. RitsemaAbstract:Soil water Repellency is much more wide-spread than formerly thought. During the last decades, it has been a topic of study for soil scientists and hydrologists in at least 21 States of the USA, in Canada, Australia, New Zealand, Mexico, Colombia, Chile, Congo, Nepal, India, Hong Kong, Taiwan, China, Ecuador, Venezuela, Brazil, Mali, Japan, Israel, Turkey, Egypt, South Africa, Germany, The Netherlands, Spain, Portugal, United Kingdom, Denmark, Sweden, Finland, Poland, Slovakia, Russia, France, Italy, and Greece. Although, water repellent soils already have been indicated at the end of the nineteenth century, they have been discovered and studied in most countries in the last decades. Water Repellency is most common in sandy soils with grass cover and in nature reserves, but has also been observed in loam, heavy clay, peat, and volcanic ash soils. From 1940 to 1970 research was focussed on identifying vegetation types responsible for inducing water Repellency and on developing techniques to quantify the degree of water Repellency. Of special interest has been the effects of wildfire on the development of soil water Repellency and its consequences for soil erosion. Due to increasing concern over the threat to surface and groundwater posed by the use of agrichemicals and organic fertilisers, studies on water repellent soils have also been focused on its typical flow behavior with runoff and the existence of preferential flow paths. Since the end of the 1950s, wetting agents and clay amendments have been studied to ameliorate water repellent soils. Since 1883, more than 1200 articles related to soil water Repellency have been published in journals, reports, and theses. An exponential increase in number of publications started in 1960, resulting in an average of 200 publications per 5 years.
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water Repellency of soils the influence of ambient relative humidity
Soil Science Society of America Journal, 2002Co-Authors: Stefan H Doerr, Richard A Shakesby, L W Dekker, Coen J. Ritsema, Robert BryantAbstract:Adverse effects of soil water Repellency (hydrophobicity) are of concern during or following rainfall or irrigation, and are often preceded by conditions of high atmospheric relative humidity (RH). Assessments of Repellency are, however, commonly conducted on air-dried samples at ambient laboratory conditions. This study explores the effects of differing antecedent RHs (32-98%) on the water Repellency of air-dried soils of wide ranging characteristics under laboratory conditions using water drop penetration time (WDPT) and ethanol-percentage tests. Most samples exhibited considerably higher water Repellency after exposure (< 1 d) to 98% RH compared with lower RHs, typical of ambient laboratory conditions. This work suggests that previous studies mayhave incorrectly classified some soils, likely to exhibit water Repellency in the field, as wettable, and that tests carried out following exposure of samples to high RH provide assessments that best reflect critical field conditions.
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water Repellency and critical soil water content in a dune sand
Soil Science Society of America Journal, 2001Co-Authors: L W Dekker, Stefan H Doerr, K Oostindie, Apostolos K Ziogas, Coen J. RitsemaAbstract:Assessments of water Repellency of soils are commonly made on air-dried or oven-dried samples, without considering the soil water content. The objectives of this study were to examine the spatial and temporal variability of soil water content, actual water Repellency over short distances, and the variations in critical soil water contents. Between 22 April and 23 November 1999, numerous samples were collected from a grass-covered dune sand (typic Psammaquent), at six depths, eight times in transects and two times in soil blocks. The water drop penetration time (WDPT) test was used to measure the actual water Repellency of the field-moist samples and the potential water Repellency after drying the samples at 25, 65, and 105 °C. Highly spatial and temporal variability in water content and persistence of actual water Repellency was found between the samples from all soil depths. At each depth we established an upper water content, below which samples were water repellent and a lower water content, above which samples were wettable. This water content range, called the transition zone, was different for each depth, and, for example, assessed at 0 to 2.5 cm depth between soil water contents of 18 and 23% (vol./vol.), and at 16.5 to 19 cm depth between 2 and 5% (vol./vol.). The potential water Repellency of samples dried at 25 and 65 °C was on some days less severe than the actual Repellency of field-moist samples on other days, thus underestimating the maximal persistence of water Repellency that can occur in the field. Drying of the samples at 105 °C significantly increased the potential water Repellency.
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occurrence of soil water Repellency in arid and humid climates
Journal of Hydrology, 2000Co-Authors: Daniel Francisco Jaramillo Jaramillo, L W Dekker, Coen J. Ritsema, Jan M H HendrickxAbstract:Abstract Soil water Repellency generally tends to increase during dry weather while it decreases or completely vanishes after heavy precipitation or during extended periods with high soil water contents. These observations lead to the hypothesis that soil water Repellency is common in dry climates and rare in humid climates. The study objective is to test this hypothesis by examining the occurrence of soil water Repellency in an arid and humid climate. The main conclusion of this study is that the effect of climate on soil water Repellency is very limited. Field observations in the arid Middle Rio Grande Basin in New Mexico (USA) and the humid Piedras Blancas Watershed in Colombia show that the main impact of climate seems to be in which manner it affects the production of organic matter. An extremely dry climate will result in low organic matter production rates and, therefore, less potential for the development of soil water Repellency. On the other hand, a very humid climate is favorable for organic matter production and, therefore, for the development of water Repellency.
Coen J. Ritsema - One of the best experts on this subject based on the ideXlab platform.
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occurrence prediction and hydrological effects of water Repellency amongst major soil and land use types in a humid temperate climate
European Journal of Soil Science, 2006Co-Authors: Stefan H Doerr, Richard A Shakesby, L W Dekker, Coen J. RitsemaAbstract: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.
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extraction of compounds associated with water Repellency in sandy soils of different origin
Soil Research, 2005Co-Authors: Stefan H Doerr, Coen J. Ritsema, C T Llewellyn, Peter Douglas, Christopher P Morley, Kathryn A Mainwaring, C Haskins, L Johnsey, Frank Stagnitti, G AllinsonAbstract: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 ◦ Ci s 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.
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water Repellency of soils the influence of ambient relative humidity
Soil Science Society of America Journal, 2002Co-Authors: Stefan H Doerr, Richard A Shakesby, L W Dekker, Coen J. Ritsema, Robert BryantAbstract:Adverse effects of soil water Repellency (hydrophobicity) are of concern during or following rainfall or irrigation, and are often preceded by conditions of high atmospheric relative humidity (RH). Assessments of Repellency are, however, commonly conducted on air-dried samples at ambient laboratory conditions. This study explores the effects of differing antecedent RHs (32-98%) on the water Repellency of air-dried soils of wide ranging characteristics under laboratory conditions using water drop penetration time (WDPT) and ethanol-percentage tests. Most samples exhibited considerably higher water Repellency after exposure (< 1 d) to 98% RH compared with lower RHs, typical of ambient laboratory conditions. This work suggests that previous studies mayhave incorrectly classified some soils, likely to exhibit water Repellency in the field, as wettable, and that tests carried out following exposure of samples to high RH provide assessments that best reflect critical field conditions.
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water Repellency and critical soil water content in a dune sand
Soil Science Society of America Journal, 2001Co-Authors: L W Dekker, Stefan H Doerr, K Oostindie, Apostolos K Ziogas, Coen J. RitsemaAbstract:Assessments of water Repellency of soils are commonly made on air-dried or oven-dried samples, without considering the soil water content. The objectives of this study were to examine the spatial and temporal variability of soil water content, actual water Repellency over short distances, and the variations in critical soil water contents. Between 22 April and 23 November 1999, numerous samples were collected from a grass-covered dune sand (typic Psammaquent), at six depths, eight times in transects and two times in soil blocks. The water drop penetration time (WDPT) test was used to measure the actual water Repellency of the field-moist samples and the potential water Repellency after drying the samples at 25, 65, and 105 °C. Highly spatial and temporal variability in water content and persistence of actual water Repellency was found between the samples from all soil depths. At each depth we established an upper water content, below which samples were water repellent and a lower water content, above which samples were wettable. This water content range, called the transition zone, was different for each depth, and, for example, assessed at 0 to 2.5 cm depth between soil water contents of 18 and 23% (vol./vol.), and at 16.5 to 19 cm depth between 2 and 5% (vol./vol.). The potential water Repellency of samples dried at 25 and 65 °C was on some days less severe than the actual Repellency of field-moist samples on other days, thus underestimating the maximal persistence of water Repellency that can occur in the field. Drying of the samples at 105 °C significantly increased the potential water Repellency.
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occurrence of soil water Repellency in arid and humid climates
Journal of Hydrology, 2000Co-Authors: Daniel Francisco Jaramillo Jaramillo, L W Dekker, Coen J. Ritsema, Jan M H HendrickxAbstract:Abstract Soil water Repellency generally tends to increase during dry weather while it decreases or completely vanishes after heavy precipitation or during extended periods with high soil water contents. These observations lead to the hypothesis that soil water Repellency is common in dry climates and rare in humid climates. The study objective is to test this hypothesis by examining the occurrence of soil water Repellency in an arid and humid climate. The main conclusion of this study is that the effect of climate on soil water Repellency is very limited. Field observations in the arid Middle Rio Grande Basin in New Mexico (USA) and the humid Piedras Blancas Watershed in Colombia show that the main impact of climate seems to be in which manner it affects the production of organic matter. An extremely dry climate will result in low organic matter production rates and, therefore, less potential for the development of soil water Repellency. On the other hand, a very humid climate is favorable for organic matter production and, therefore, for the development of water Repellency.
Gerd Wessolek - One of the best experts on this subject based on the ideXlab platform.
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determination of Repellency distribution using soil organic matter and water content
Geoderma, 2005Co-Authors: K Taumer, Heiner Stoffregen, Gerd WessolekAbstract:The aim of this study is to investigate the effect of soil moisture and soil organic matter content on the water Repellency of a former sewage field. A topsoil block (40×80×30 cm) and a soil transect (300×100 cm) from a former wastewater infiltration site near Berlin were sampled with a high spatial resolution for this purpose. Actual and potential water Repellency were measured using the Water Drop Penetration Time (WDPT) test. Gravimetric water content and soil organic matter (SOM) were determined for each sample; a total of 864 soil samples were analysed. The investigations were carried out in January 2003. Water Repellency occurred in the top soil even during this winter period. The spatial distribution of water content and water Repellency clearly showed preferential flow paths. Water Repellency was measured at field moist samples (actual Repellency) and at dried samples (potential Repellency). The transition zone for distinguishing between water repellent and wettable regions was determined to be 0.15 g g−1. Therefore, a calculation of the wettability by water content alone is not possible. We suggest a new approach for calculating a so-called ‘critical water content’ (Θcrit) as a function of the amount of soil organic matter (SOM). The function Θcrit (g g−1)=1.12 SOM (g g−1)+0.037 g g−1 leads to a better prediction of wettable and non-wettable soil regions for the entire soil profile. The distinction between these regions is necessary for the calculation of the water and solute transport in a two- or three-dimensional numeric model.
Nancy Alanis - One of the best experts on this subject based on the ideXlab platform.
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effect of fire severity on water Repellency and aggregate stability on mexican volcanic soils
Catena, 2011Co-Authors: Antonio Jordan, Jorge Mataixsolera, Lorena M Zavala, Alejandra L Nava, Nancy AlanisAbstract:Abstract A field study was conducted in order to study the effects of different wildfire severities on [1] soil organic matter content, [2] soil water Repellency, and [3] aggregate stability; [4] the distribution of soil water Repellency in aggregate sieve fractions (1–2, 0.5–1, 0.25–0.5 and
