The Experts below are selected from a list of 103887 Experts worldwide ranked by ideXlab platform
J Adamson - One of the best experts on this subject based on the ideXlab platform.
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the effects of burning and sheep grazing on Water table depth and Soil Water Quality in a upland peat
Journal of Hydrology, 2007Co-Authors: Fred Worrall, Alona Armstrong, J AdamsonAbstract:Rotational burning of heather to improve grazing and grouse breeding is a common management practice for upland catchments in the UK. However, the effects of such practices on hydrology and Water Quality are not well understood because the timescale of burning rotation is typically between 7 and 20 years thus requiring long-term experiments in order to resolve the effects. Furthermore, land management, such as changes in burning or grazing practices, has been proposed as a possible strategy for the remediation of the widespread increases in dissolved organic carbon (DOC) observed across the northern hemisphere. This study is based on a long-term experiment on the effect of different rotational burning cycles and grazing intensities on upland vegetation and aims to understand the effects of these management strategies on hydrology and Water Quality. The main outcomes are: (i) The depth to Water table in the Soil showed significant differences between different burning rotations and grazing intensities. Depth to Water table was greatest on plots where burning did not occur or for longer burning cycles where livestock had been excluded. (ii) The pH and conductivity of sampled Soil Water showed no significant difference between grazing treatments, with the presence of burning being the most important factor (frequency of the burning cycle was not important). (iii) The DOC content showed no significant difference between grazing treatments but showed a significant decrease with the presence of burning, though no direct relationship with the depth to Water table could be found. (iv) Burn management explains only a small proportion of the variance in the composition of the DOC, rather the variation is dominated by the differences between days of sampling and seasonal variation. Therefore, this study suggests that land management controls hydrology and Water Quality through controlling the development of vegetation.
M V Fey - One of the best experts on this subject based on the ideXlab platform.
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prediction of the Soil depth salinity trend in a vineyard after sustained irrigation with saline Water
Agricultural Water Management, 2009Co-Authors: W P De Clercq, M Van Meirvenne, M V FeyAbstract:Remote sensing combined with an ability to look deeper than the Soil surface is currently high in demand. This study was conducted through scaling down the amount of Soil data from a saline irrigation Water experiment to see if one can still capture the essential Soil salinity depth trends within the data, to a level that can enhance the ability of remote methods. A saline irrigation experiment with 6 Water qualities was conducted for 8 years on 1.2 ha of vineyard land near Robertson in the Western Cape Province of South Africa. Soil Water was sampled at regular intervals at 5 depths between 0.15 and 1.2 m with suction cup lysimeters at a fixed time following each irrigation. Electrical conductivity of the Soil Water (ECsw) was determined after sampling. Data collected over the full 8-year period were investigated for depth trends in ECsw, seeking trend lines with lowest polynomial order that were still significantly predict the salinity profile. At all treatment levels a first order polynomial equation, fitted to the salinity profiles, significantly predicted the salinity trends. The ECsw value at only two depths could therefore be used to calculate total salt accumulation and Soil Water Quality below the root zone. The implication is that considerable value can be obtained from minimal measurements both in estimating salt accumulation in the Soil profile and predicting Water Quality in return flow from saline irrigation.
Fred Worrall - One of the best experts on this subject based on the ideXlab platform.
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the effects of burning and sheep grazing on Water table depth and Soil Water Quality in a upland peat
Journal of Hydrology, 2007Co-Authors: Fred Worrall, Alona Armstrong, J AdamsonAbstract:Rotational burning of heather to improve grazing and grouse breeding is a common management practice for upland catchments in the UK. However, the effects of such practices on hydrology and Water Quality are not well understood because the timescale of burning rotation is typically between 7 and 20 years thus requiring long-term experiments in order to resolve the effects. Furthermore, land management, such as changes in burning or grazing practices, has been proposed as a possible strategy for the remediation of the widespread increases in dissolved organic carbon (DOC) observed across the northern hemisphere. This study is based on a long-term experiment on the effect of different rotational burning cycles and grazing intensities on upland vegetation and aims to understand the effects of these management strategies on hydrology and Water Quality. The main outcomes are: (i) The depth to Water table in the Soil showed significant differences between different burning rotations and grazing intensities. Depth to Water table was greatest on plots where burning did not occur or for longer burning cycles where livestock had been excluded. (ii) The pH and conductivity of sampled Soil Water showed no significant difference between grazing treatments, with the presence of burning being the most important factor (frequency of the burning cycle was not important). (iii) The DOC content showed no significant difference between grazing treatments but showed a significant decrease with the presence of burning, though no direct relationship with the depth to Water table could be found. (iv) Burn management explains only a small proportion of the variance in the composition of the DOC, rather the variation is dominated by the differences between days of sampling and seasonal variation. Therefore, this study suggests that land management controls hydrology and Water Quality through controlling the development of vegetation.
W P De Clercq - One of the best experts on this subject based on the ideXlab platform.
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prediction of the Soil depth salinity trend in a vineyard after sustained irrigation with saline Water
Agricultural Water Management, 2009Co-Authors: W P De Clercq, M Van Meirvenne, M V FeyAbstract:Remote sensing combined with an ability to look deeper than the Soil surface is currently high in demand. This study was conducted through scaling down the amount of Soil data from a saline irrigation Water experiment to see if one can still capture the essential Soil salinity depth trends within the data, to a level that can enhance the ability of remote methods. A saline irrigation experiment with 6 Water qualities was conducted for 8 years on 1.2 ha of vineyard land near Robertson in the Western Cape Province of South Africa. Soil Water was sampled at regular intervals at 5 depths between 0.15 and 1.2 m with suction cup lysimeters at a fixed time following each irrigation. Electrical conductivity of the Soil Water (ECsw) was determined after sampling. Data collected over the full 8-year period were investigated for depth trends in ECsw, seeking trend lines with lowest polynomial order that were still significantly predict the salinity profile. At all treatment levels a first order polynomial equation, fitted to the salinity profiles, significantly predicted the salinity trends. The ECsw value at only two depths could therefore be used to calculate total salt accumulation and Soil Water Quality below the root zone. The implication is that considerable value can be obtained from minimal measurements both in estimating salt accumulation in the Soil profile and predicting Water Quality in return flow from saline irrigation.
Ingyu Choi - One of the best experts on this subject based on the ideXlab platform.
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effect of low concentration liquid manure application on Soil Water and groundWater Quality in bio circulation experimental forest
Journal of The Korean Society of Agricultural Engineers, 2010Co-Authors: Eunmi Hong, Jinyong Choi, Seunghwan Yoo, Wonho Nam, Jinkie Yeo, Ingyu ChoiAbstract:Manure recycling as fertilizer is one of solutions for the environmental problem related with livestock manure treatment as well as the ocean dumping ban act prohibiting manure disposal to the ocean. For the manure disposal, forest area can be a candidate place because the area has a wide range of applicable sites. However, the manure application to the forest has a possibility of causing environmental impacts including Water Quality problems due to nutrient loading. Therefore it is necessary to investigate Water Quality impact from manure disposal to the forestry plantation. In this study, ground and Soil Water Quality had been monitored in the bio-circulation experimental forest where low concentration liquid manure (LCLM) was applied. Soil and groundWater samples were collected and analyzed weekly from April to October in 2008 and 2009. The mean and variation of NO3-N concentration in Soil Water of LCLM treatment places showed higher concentration than the reference places declining during growing season. In the case of groundWater from monitoring well in the downstream of disposal site, the -N concentration was 3.59 mg/L in 2008 and 3.26 mg/L in 2009 in average showing higher concentration than the reference well although the concentration was not exceed the national drinking Water standard. To investigate the source of nitrate, isotope analysis was also implemented. Its result showed that the LCLM application could be the nitrate source requiring further long-term monitoring Soil and Water Quality.