The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform
Edward A. D. Mitchell - One of the best experts on this subject based on the ideXlab platform.
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Spatio-temporal heterogeneity of riparian Soil Morphology in a restored floodplain
Hydrology and Earth System Sciences, 2013Co-Authors: Bertrand Fournier, Claire Guenat, Géraldine Bullinger-weber, Edward A. D. MitchellAbstract:Floodplains have been intensively altered in indus- trialized countries, but are now increasingly being restored. It is therefore important to assess the effect of these restoration projects on the aquatic and terrestrial components of ecosys- tems. However, despite being functionally crucial compo- nents of terrestrial ecosystems, Soils are generally overlooked in floodplain restoration assessments. We studied the spatio-temporal heterogeneity of Soil mor- phology in a restored (riverbed widening) river reach along the River Thur (Switzerland) using three criteria (Soil diver- sity, dynamism and typicality) and their associated indica- tors. We hypothesized that these criteria would correctly dis- criminate the post-restoration changes in Soil Morphology, and that these changes correspond to patterns of vascular plant diversity. Soil diversity and dynamism increased 5 yr after the restoration, but some typical Soils of braided rivers were still missing. Soil typicality and dynamism were correlated to vegetation changes. These results suggest a limited success of the project, in agreement with evaluations carried out at the same site using other, more resource-demanding, meth- ods (e.g., Soil fauna, fish diversity, ecosystem functioning). Soil Morphology provides structural and functional infor- mation on floodplain ecosystems. The spatio-temporal het- erogeneity of Soil Morphology represents a cost-efficient ecological indicator that could easily be integrated into rapid assessment protocols of floodplain and river restoration projects. The follow-up assessment after several major floods ( HQ20) should take place to allow for testing the longer- term validity of our conclusion for the River Thur site. More generally, it would be useful to apply the Soil mor- phology indicator approach in different settings to test its broader applicability.
Zueng-sang Chen - One of the best experts on this subject based on the ideXlab platform.
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Relationships between topography and spatial variations in groundwater and Soil Morphology within the Taoyuan–Hukou Tableland, Northwestern Taiwan
Geomorphology, 2007Co-Authors: Yu-shih Lin, Yi-wen Lin, Yu Wang, Yue-gau Chen, Mei-ling Hsu, Shou-hao Chiang, Zueng-sang ChenAbstract:This study examines the relationships between topography and spatial variations in groundwater and Soil Morphology within the multi-step Taoyuan–Hukou Tableland in northwest Taiwan. Several different geomorphological and pedological approaches were jointly undertaken, including analyses of a digital elevation model (DEM), a reclassified Soil map, field survey results, engineering borehole data, and a hydrological simulation. Five major geomorphic surfaces were identified based on terrace scarps observed in the DEM; minor surfaces separated by small fluvial scarps or tectonic scarps were also mapped. The simplified Soil map and field study of Soil Morphology reveal a number of Soil-distribution patterns associated with specific topographic settings. Soil Morphology changes from homogeneous red Soils in the fore-edge of surfaces to mottled Soils and finally to gley Soils in back-edge regions. Such a pattern is more pronounced in the proximal part of a surface, while toward the distal zone the patterns tend to be obscured by increasing amounts of mottled and gley Soils. The proportion of homogeneous Soils increases with narrowing of the surface. For fan-shaped surfaces, Soil types appear to be dominated by mottled Soils except for at terrace edges, where homogeneous red Soils occur. While homogeneous Soils dominate tectonically elevated surfaces, a toposequence of homogeneousmottled-gley Soils occurs in the surrounded lowlands. Borehole data and hydrological models indicate that these Soil-distribution patterns are strongly related to groundwater occurrence and fluvial processes, both of which are generally governed by topography. Despite the observed pedodiversity in this area, the common feature of these toposequences, i.e., the distribution of homogeneous red Soils along the surface fore-edge, may serve as a basis for establishing a reliable Soil chronosequence for the area. © 2007 Elsevier B.V. All rights reserved.
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Soil morphological variations on the Taoyuan Terrace, Northwestern Taiwan: Roles of topography and groundwater
Geomorphology, 2005Co-Authors: Yu-shih Lin, Yue-gau Chen, Zueng-sang Chen, Meng-long HsiehAbstract:To understand whether Soils on the same geomorphic surface have similar properties, this study examines the Morphology of Soils developed on the 30-kyr-old Taoyuan Terrace, Northwestern Taiwan. Relationships among Soil Morphology, variations in the groundwater table, and Soil forming processes were established based on field investigations and previously published datasets. The Soil series in the study area can be grouped into seven types, including three homogeneous groups, two mottled groups, one gley group, and one reworked group. Fifteen hand-core samples collected in the field and borehole data were used to understand spatial variations in Soil Morphology. The results indicate that Soil Morphology on the southern Taoyuan Terrace changes systematically from the fore-edge to the back-edge: from red/orange Soils to yellow Soils, then to mottled Soils, and finally to gley Soils. The borehole data indicate that the groundwater table is generally parallel to the ground surface but drops significantly near the terrace fore-edge. This pattern matches with the observed Soil toposequence, indicating that the pedogenic processes in the study area are mainly controlled by groundwater distribution determined by topography. Although Soils on the terrace fore-edge have developed under the well-drained conditions that favor lateritization, at least two distinct Soil types (i.e., red and orange) can be observed there, reflecting different geomorphological settings in a paleo-fluvial landscape. This work suggests that geomorphological and hydrological conditions should be examined carefully before using Soil Morphology for correlating geomorphic surfaces.
Yu-shih Lin - One of the best experts on this subject based on the ideXlab platform.
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Relationships between topography and spatial variations in groundwater and Soil Morphology within the Taoyuan–Hukou Tableland, Northwestern Taiwan
Geomorphology, 2007Co-Authors: Yu-shih Lin, Yi-wen Lin, Yu Wang, Yue-gau Chen, Mei-ling Hsu, Shou-hao Chiang, Zueng-sang ChenAbstract:This study examines the relationships between topography and spatial variations in groundwater and Soil Morphology within the multi-step Taoyuan–Hukou Tableland in northwest Taiwan. Several different geomorphological and pedological approaches were jointly undertaken, including analyses of a digital elevation model (DEM), a reclassified Soil map, field survey results, engineering borehole data, and a hydrological simulation. Five major geomorphic surfaces were identified based on terrace scarps observed in the DEM; minor surfaces separated by small fluvial scarps or tectonic scarps were also mapped. The simplified Soil map and field study of Soil Morphology reveal a number of Soil-distribution patterns associated with specific topographic settings. Soil Morphology changes from homogeneous red Soils in the fore-edge of surfaces to mottled Soils and finally to gley Soils in back-edge regions. Such a pattern is more pronounced in the proximal part of a surface, while toward the distal zone the patterns tend to be obscured by increasing amounts of mottled and gley Soils. The proportion of homogeneous Soils increases with narrowing of the surface. For fan-shaped surfaces, Soil types appear to be dominated by mottled Soils except for at terrace edges, where homogeneous red Soils occur. While homogeneous Soils dominate tectonically elevated surfaces, a toposequence of homogeneousmottled-gley Soils occurs in the surrounded lowlands. Borehole data and hydrological models indicate that these Soil-distribution patterns are strongly related to groundwater occurrence and fluvial processes, both of which are generally governed by topography. Despite the observed pedodiversity in this area, the common feature of these toposequences, i.e., the distribution of homogeneous red Soils along the surface fore-edge, may serve as a basis for establishing a reliable Soil chronosequence for the area. © 2007 Elsevier B.V. All rights reserved.
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Soil morphological variations on the Taoyuan Terrace, Northwestern Taiwan: Roles of topography and groundwater
Geomorphology, 2005Co-Authors: Yu-shih Lin, Yue-gau Chen, Zueng-sang Chen, Meng-long HsiehAbstract:To understand whether Soils on the same geomorphic surface have similar properties, this study examines the Morphology of Soils developed on the 30-kyr-old Taoyuan Terrace, Northwestern Taiwan. Relationships among Soil Morphology, variations in the groundwater table, and Soil forming processes were established based on field investigations and previously published datasets. The Soil series in the study area can be grouped into seven types, including three homogeneous groups, two mottled groups, one gley group, and one reworked group. Fifteen hand-core samples collected in the field and borehole data were used to understand spatial variations in Soil Morphology. The results indicate that Soil Morphology on the southern Taoyuan Terrace changes systematically from the fore-edge to the back-edge: from red/orange Soils to yellow Soils, then to mottled Soils, and finally to gley Soils. The borehole data indicate that the groundwater table is generally parallel to the ground surface but drops significantly near the terrace fore-edge. This pattern matches with the observed Soil toposequence, indicating that the pedogenic processes in the study area are mainly controlled by groundwater distribution determined by topography. Although Soils on the terrace fore-edge have developed under the well-drained conditions that favor lateritization, at least two distinct Soil types (i.e., red and orange) can be observed there, reflecting different geomorphological settings in a paleo-fluvial landscape. This work suggests that geomorphological and hydrological conditions should be examined carefully before using Soil Morphology for correlating geomorphic surfaces.
Bertrand Fournier - One of the best experts on this subject based on the ideXlab platform.
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Spatio-temporal heterogeneity of riparian Soil Morphology in a restored floodplain
Hydrology and Earth System Sciences, 2013Co-Authors: Bertrand Fournier, Claire Guenat, Géraldine Bullinger-weber, Edward A. D. MitchellAbstract:Floodplains have been intensively altered in indus- trialized countries, but are now increasingly being restored. It is therefore important to assess the effect of these restoration projects on the aquatic and terrestrial components of ecosys- tems. However, despite being functionally crucial compo- nents of terrestrial ecosystems, Soils are generally overlooked in floodplain restoration assessments. We studied the spatio-temporal heterogeneity of Soil mor- phology in a restored (riverbed widening) river reach along the River Thur (Switzerland) using three criteria (Soil diver- sity, dynamism and typicality) and their associated indica- tors. We hypothesized that these criteria would correctly dis- criminate the post-restoration changes in Soil Morphology, and that these changes correspond to patterns of vascular plant diversity. Soil diversity and dynamism increased 5 yr after the restoration, but some typical Soils of braided rivers were still missing. Soil typicality and dynamism were correlated to vegetation changes. These results suggest a limited success of the project, in agreement with evaluations carried out at the same site using other, more resource-demanding, meth- ods (e.g., Soil fauna, fish diversity, ecosystem functioning). Soil Morphology provides structural and functional infor- mation on floodplain ecosystems. The spatio-temporal het- erogeneity of Soil Morphology represents a cost-efficient ecological indicator that could easily be integrated into rapid assessment protocols of floodplain and river restoration projects. The follow-up assessment after several major floods ( HQ20) should take place to allow for testing the longer- term validity of our conclusion for the River Thur site. More generally, it would be useful to apply the Soil mor- phology indicator approach in different settings to test its broader applicability.
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Spatio-temporal heterogeneity of riparian Soil Morphology
2013Co-Authors: Bertrand Fournier, Claire Guenat, Géraldine Bullinger-weber, Mitchell EdwardAbstract:Abstract. Floodplains have been intensively altered in industrialized countries, but are now increasingly being restored and it is therefore important to assess the effect of these restoration projects on the aquatic and terrestrial components of ecosystems. Soils are a functionally crucial component of terrestrial ecosystems but are generally overlooked in floodplain restoration assessment. We studied the spatio-temporal heterogeneity of Soil Morphology in a restored (riverbed widening) river reach along River Thur (Switzerland) using three criteria (Soil diversity, dynamism and typicality) and their associated indicators. We hypothesized that these criteria would correctly discriminate the post-restoration changes in Soil Morphology within the study site, and that these changes correspond to patterns of vascular plant diversity. Soil diversity and dynamism increased five years after the restoration, but typical Soils of braided rivers were still missing. Soil typicality and dynamism correlated to vegetation changes. These results suggest a limited success of the project in agreement with evaluations carried out at the same site using other, more resource demanding methods (e.g. Soil fauna, fish, ecosystem functioning). Soil Morphology provides structural and functional information on floodplain ecosystems and allows predicting broad changes in plant diversity. The spatio-temporal heterogeneity of Soil Morphology represents a cost-efficient ecological indicator that could easily be integrated into rapid assessment protocols of floodplain and river restoration projects.
Jozef Deckers - One of the best experts on this subject based on the ideXlab platform.
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Condition of Quercus robur L. along a natural Luvisol microtoposequence on loess in Central Belgium
Soil Use and Management, 2006Co-Authors: R. Moortel, S. Rampelberg, Jozef DeckersAbstract:. This research aims to assess how the variability in Soil Morphology of Luvisols along a microtopographic sequence influences the condition of pedunculate oak (Quercus robur). The condition of 205 pedunculate oaks was observed during one growth season and related to morphological Soil properties. Results show that the presence of a consolidated argillic B horizon or fragipan in Luvisols, has a negative influence on the condition of Q.robur.
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Quantifying Soil Morphology in Tropical Environments Methods and Application in Soil Classification
Soil Science Society of America Journal, 2000Co-Authors: Anne Gobin, Jozef Deckers, Paul Campling, Jan FeyenAbstract:We tested the hypothesis that readily observed and easily measured morphological variables can he used to characterize the Soils sampled and described in southeastern Nigeria for purposes of land use and management. Field tests were developed for estimating Soil texture and amount of ironstone nodules, Two new Soil color indices provided an immediate means of diagnosing the Soil drainage regime in case of the color index (Cl) and Soil forming processes in tropical Soils in case of the redness index (RI). The indices correlated negatively with organic C content (R = -0.39) and positively with dithionite-extracted Fe 2 O 3 (0.44) and Al 2 O 3 (0.51). Inexpensive field tests for color, texture, and ironstone can be quantified using color indices and laboratory measurements. The local Soil classification was quantified by means of color indices (RI, CI) and percentages of ironstone, sand, silt, and clay measured in the A horizon. A classification based on Soil texture, ironstone, and color was used to define classes for the B horizon. The two first principal components (PC) extracted from Soil morphological variables measured on the upper three horizons of 72 pedons explained 64.7% of the total variance. Nonhierarchical clustering performed on the two PCs produced seven clusters that compare well with the great groups of U.S. Soil taxonomy. Principal component analysis on 211 Soil chemical and morphological variables confirmed that Soil texture, ironstone, and Soil color account for most of the variation of the Soils and provide an efficient means of characterizing tropical Soils derived from sedimentary parent material.
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Soil Morphology and Soil water regime of loess Soils under oak in the Meerdaal forest, Belgium
Agricultural and Forest Meteorology, 1997Co-Authors: S. Rampelberg, Jozef DeckersAbstract:Soil water content of the top layer of a Soil catena of Hapludalfs and Fragiudalfs was monitored in an experimental field site under oak in the Meerdaal forest. Knowledge of the Soil water regime is needed to assess Soil suitability of the Soils in the forest for natural regeneration of oak. The Soil water content was measured during one season using time domain reflectometry. In contradiction to what was expected, the top Soil in the zones of the catena with a clear fragipan in the underground is significantly and consistently drier than the top Soil in the zones with a homogeneous, unconsolidated argic B horizon. This is explained by the specific morphologic features of the fragipan which are a direct result of its formation process.