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  1. AU="Muwamba, A"
  2. AU=Kannangara Ajith P. AU=Kannangara Ajith P.
  3. AU=Tosoni Daniela
  4. AU=Cinesi Gmez Csar AU=Cinesi Gmez Csar
  5. AU="White, Andy"
  6. AU="Merlo, Juan"
  7. AU="Curling, P E"
  8. AU="Debraine, Arnaud"
  9. AU="Lambe, Cecile"
  10. AU="Jeong, Haneal"
  11. AU="Afaque, Syed Muhammad"
  12. AU=Layer Ryan M.
  13. AU="Rotaru, Luciana Teodora"
  14. AU="Nash, Kevin M"
  15. AU="Kubo, Sousuke"
  16. AU="Ingo Eitel"
  17. AU="van der Horst, A."
  18. AU="Di Mattia, A" AU="Di Mattia, A"
  19. AU="Di Pumpo, Marcello"
  20. AU="Doung, Yee-Cheen"
  21. AU="Saha, Moumita"
  22. AU="Wertz, Ashlee E"
  23. AU="Cowan, Michael J"
  24. AU=Togliatto Gabriele
  25. AU="Bassett, Dani S."
  26. AU="James Lemon"
  27. AU="Gros, Stephanie J"
  28. AU="Saeed Khademi"
  29. AU="Lallet-Daher, Helene"
  30. AU="Greenblatt, M"
  31. AU="Patwa, Ajay K"
  32. AU=Mastaglia F L
  33. AU="De Croock, Femke"
  34. AU=Robinson Michael J
  35. AU=Singh Romil
  36. AU="Martin, S J"
  37. AU="Szendrői, Miklós"
  38. AU="Moncel, Marie-Hélène"
  39. AU=Otu Akaninyene AU=Otu Akaninyene
  40. AU="Chiba, Kentaro"
  41. AU="Zhou, Jihua"
  42. AU="Ronald Bartels"
  43. AU="Liñares, J"
  44. AU="Valle, Valentina"
  45. AU="Tóth, András"
  46. AU="Pawar, Atul Darasing"
  47. AU="Semper, Chelsea"
  48. AU="Kraus, Joanne F"

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  1. Artikel: Effect of Water Table Depth on Nutrient Concentrations Below the Water Table in a Spodosol

    Muwamba, A / P. Nkedi-Kizza / K. T. Morgan

    Water, air, and soil pollution. 2018 Mar., v. 229, no. 3

    2018  

    Abstract: Water table depth manipulations as implemented in sugarcane fields of Southwestern Florida, USA, were hypothesized to influence the nutrient concentrations below the water table. Concentrations of phosphorus (P), potassium (K), nitrogen (N), and bromide ( ...

    Abstract Water table depth manipulations as implemented in sugarcane fields of Southwestern Florida, USA, were hypothesized to influence the nutrient concentrations below the water table. Concentrations of phosphorus (P), potassium (K), nitrogen (N), and bromide (Br⁻) were monitored above and below the water table using a column leaching experiment. Three columns were packed with Immokalee soil (A, E, and Bh horizons) classified as a spodosol and fertilizers (NPK) were applied on the soil surface as solids using rates of 11 kg P ha⁻¹, 166 kg K ha⁻¹, and 200 kg N ha⁻¹. A fourth column where fertilizer mixture and bromide were not added acted as a blank. Potassium was also applied as KBr with bromide used as tracer for water movement. Water table was maintained at 30 cm for 6 weeks and lowered to 50 cm deep for another 6 weeks. Samplers were placed in A, E, and Bh horizons and outlets were placed at 30 and 50 cm deep to obtain solutions for monitoring nutrients and tracer. Solution samplers placed in E and Bh horizons were located below the water table. Slightly elevated P, N, and K concentrations in E horizon for a 50-cm water table depth treatment were observed. For both water table treatments, minimal loss of applied N, P, and K below the water table was observed. The results of the study have shown that movement of nutrients below the water table is slow, and depends on the type of nutrients applied and the water table depth.
    Schlagwörter E horizons ; Spodosols ; fertilizers ; leaching ; monitoring ; nitrogen ; nutrient content ; nutrients ; phosphorus ; potassium ; potassium bromide ; samplers ; sugarcane ; water table ; Florida
    Sprache Englisch
    Erscheinungsverlauf 2018-03
    Umfang p. 83.
    Erscheinungsort Springer International Publishing
    Dokumenttyp Artikel
    ZDB-ID 120499-3
    ISSN 1573-2932 ; 0049-6979 ; 0043-1168
    ISSN (online) 1573-2932
    ISSN 0049-6979 ; 0043-1168
    DOI 10.1007/s11270-018-3727-z
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  2. Artikel: Determination of Sorption Coefficient of Phosphorus Applied for Sugarcane Production in Southwestern Florida

    Muwamba, A / Morgan, K. T / Nkedi-Kizza, P

    Journal of environmental quality. 2016 Sept., v. 45, no. 5

    2016  

    Abstract: Phosphorus is among the essential nutrients applied to sugarcane (Saccharum officinarum L.) fields in the form of a fertilizer mixture (N, P, and K) in southwestern Florida. Sorption coefficient is used for modeling P movement, and in this study, we ... ...

    Abstract Phosphorus is among the essential nutrients applied to sugarcane (Saccharum officinarum L.) fields in the form of a fertilizer mixture (N, P, and K) in southwestern Florida. Sorption coefficient is used for modeling P movement, and in this study, we hypothesized that the sorption coefficient determined using fertilizer mixture (N, P, and K) will be significantly different from values determined using KCl and CaCl2, the electrolytes most commonly used for conducting sorption experiments. Supporting electrolytes, 0.01 mol L−1 KCl, 0.005 mol L−1 CaCl2, deionized (DI) water, simulated Florida rain, and fertilizer mixture prepared in Florida rain were used to characterize P sorption. Immokalee (Sandy, siliceous, hyperthermic Arenic Alaquods) and Margate (Sandy, siliceous hyperthermic Mollic Psammaquents) are the dominant mineral soils used for sugarcane production in southwestern Florida; we used the A and Bw horizons of Margate soil and the A and Bh horizons of the Immokalee soil for sorption experiments in this study. Freundlich sorption isotherms described P sorption data. The Freundlich sorption isotherm coefficients followed the trend 0.005 mol L−1 CaCl2 > 0.01 mol L−1 KCl ≈ fertilizer mixture > simulated Florida rain ≈ DI water. Sorption coefficients were used for modeling P movement with HYDRUS 1D; similar P results were obtained with the 0.01 mol L−1 KCl and fertilizer mixture electrolyte treatments. The sorption coefficient for DI water and simulated Florida rain overpredicted P movement. The P sorption data showed the importance of choosing the appropriate electrolyte for conducting experiments based on the composition of fertilizer.
    Schlagwörter A horizons ; Alaquods ; B horizons ; calcium chloride ; crop production ; electrolytes ; fertilizers ; mineral soils ; models ; nitrogen ; nutrients ; phosphorus ; potassium ; potassium chloride ; Psammaquents ; rain ; Saccharum officinarum ; sorption ; sorption isotherms ; sugarcane ; Florida
    Sprache Englisch
    Erscheinungsverlauf 2016-09
    Umfang p. 1760-1768.
    Erscheinungsort The American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc.
    Dokumenttyp Artikel
    Anmerkung epub
    ZDB-ID 120525-0
    ISSN 1537-2537 ; 0047-2425
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  3. Artikel: Determination of Sorption Coefficient of Phosphorus Applied for Sugarcane Production in Southwestern Florida.

    Muwamba, A / Nkedi-Kizza, P / Morgan, K T

    Journal of environmental quality

    2016  Band 45, Heft 5, Seite(n) 1760–1768

    Abstract: Phosphorus is among the essential nutrients applied to sugarcane ( L.) fields in the form of a fertilizer mixture (N, P, and K) in southwestern Florida. Sorption coefficient is used for modeling P movement, and in this study, we hypothesized that the ... ...

    Abstract Phosphorus is among the essential nutrients applied to sugarcane ( L.) fields in the form of a fertilizer mixture (N, P, and K) in southwestern Florida. Sorption coefficient is used for modeling P movement, and in this study, we hypothesized that the sorption coefficient determined using fertilizer mixture (N, P, and K) will be significantly different from values determined using KCl and CaCl, the electrolytes most commonly used for conducting sorption experiments. Supporting electrolytes, 0.01 mol L KCl, 0.005 mol L CaCl, deionized (DI) water, simulated Florida rain, and fertilizer mixture prepared in Florida rain were used to characterize P sorption. Immokalee (Sandy, siliceous, hyperthermic Arenic Alaquods) and Margate (Sandy, siliceous hyperthermic Mollic Psammaquents) are the dominant mineral soils used for sugarcane production in southwestern Florida; we used the A and B horizons of Margate soil and the A and B horizons of the Immokalee soil for sorption experiments in this study. Freundlich sorption isotherms described P sorption data. The Freundlich sorption isotherm coefficients followed the trend 0.005 mol L CaCl > 0.01 mol L KCl ≈ fertilizer mixture > simulated Florida rain ≈ DI water. Sorption coefficients were used for modeling P movement with HYDRUS 1D; similar P results were obtained with the 0.01 mol L KCl and fertilizer mixture electrolyte treatments. The sorption coefficient for DI water and simulated Florida rain overpredicted P movement. The P sorption data showed the importance of choosing the appropriate electrolyte for conducting experiments based on the composition of fertilizer.
    Mesh-Begriff(e) Adsorption ; Agriculture ; Fertilizers ; Florida ; Phosphorus/analysis ; Saccharum ; Soil ; Soil Pollutants ; Water Pollutants, Chemical/analysis
    Chemische Substanzen Fertilizers ; Soil ; Soil Pollutants ; Water Pollutants, Chemical ; Phosphorus (27YLU75U4W)
    Sprache Englisch
    Erscheinungsdatum 2016-10-03
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 120525-0
    ISSN 1537-2537 ; 0047-2425
    ISSN (online) 1537-2537
    ISSN 0047-2425
    DOI 10.2134/jeq2016.03.0087
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  4. Artikel ; Online: Regional Differences in Stream Water Nitrogen, Phosphorus, and Sediment Responses to Forest Harvesting in the Conterminous USA.

    Muwamba, Augustine / Rau, Benjamin / Trettin, Carl C / Amatya, Devendra M / Tollner, Ernest W / Panda, Sudhanshu

    Journal of environmental quality

    2019  Band 48, Heft 3, Seite(n) 634–644

    Abstract: Forest harvesting and management techniques were hypothesized to result in significant differences in stream water N (NO-N), P (total P [TP]), and total suspended sediment (TSS) responses among regions of United States. The objectives were (i) to ... ...

    Abstract Forest harvesting and management techniques were hypothesized to result in significant differences in stream water N (NO-N), P (total P [TP]), and total suspended sediment (TSS) responses among regions of United States. The objectives were (i) to determine the mean response periods after harvesting for each water quality variable, (ii) to compare the regional response yields, and (iii) to determine relationships among water quality, rainfall, and flow. Watershed-scale studies where best management practices were implemented provided a basis for water quality analyses. A mixed model was used to estimate the time from harvest to time when the harvested site yielded similar export as the reference site (response period). Normalized water quality yields were calculated as response yields (kg ha yr) times estimated response periods. Significant differences among yields were identified using ANOVA and Tukey test (α = 0.05), and relationships between water quality and hydrologic variables were identified using multivariate analysis (α = 0.05). The ratio of estimated mean response period for TSS to NO-N and TP, each individually, was approximately two. The mean normalized NO-N response yield was greater for the northern than the southern and/or western regions. Normalized NO-N and TSS response yields were greater for plantations than for other harvest types. The TSS export significantly increased with discharge from plantations. The literature-based response periods used in this study were not fully monitored, and soil surface manipulations after harvesting pose a significant influence on sediment export in the United States.
    Mesh-Begriff(e) Environmental Monitoring ; Forests ; Nitrogen ; Phosphorus ; Rivers ; United States ; Water ; Water Movements
    Chemische Substanzen Water (059QF0KO0R) ; Phosphorus (27YLU75U4W) ; Nitrogen (N762921K75)
    Sprache Englisch
    Erscheinungsdatum 2019-06-10
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 120525-0
    ISSN 1537-2537 ; 0047-2425
    ISSN (online) 1537-2537
    ISSN 0047-2425
    DOI 10.2134/jeq2018.04.0145
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  5. Artikel: Regional Differences in Stream Water Nitrogen, Phosphorus, and Sediment Responses to Forest Harvesting in the Conterminous USA

    Muwamba, Augustine / Rau, Benjamin / Trettin, Carl. C / Amatya, Devendra. M / Tollner, Ernest W / Panda, Sudhanshu

    Journal of environmental quality. 2019 May, v. 48, no. 3

    2019  

    Abstract: Forest harvesting and management techniques were hypothesized to result in significant differences in stream water N (NO₃–N), P (total P [TP]), and total suspended sediment (TSS) responses among regions of United States. The objectives were (i) to ... ...

    Abstract Forest harvesting and management techniques were hypothesized to result in significant differences in stream water N (NO₃–N), P (total P [TP]), and total suspended sediment (TSS) responses among regions of United States. The objectives were (i) to determine the mean response periods after harvesting for each water quality variable, (ii) to compare the regional response yields, and (iii) to determine relationships among water quality, rainfall, and flow. Watershed-scale studies where best management practices were implemented provided a basis for water quality analyses. A mixed model was used to estimate the time from harvest to time when the harvested site yielded similar export as the reference site (response period). Normalized water quality yields were calculated as response yields (kg ha⁻¹ yr⁻¹) times estimated response periods. Significant differences among yields were identified using ANOVA and Tukey test (α = 0.05), and relationships between water quality and hydrologic variables were identified using multivariate analysis (α = 0.05). The ratio of estimated mean response period for TSS to NO₃–N and TP, each individually, was approximately two. The mean normalized NO₃–N response yield was greater for the northern than the southern and/or western regions. Normalized NO₃–N and TSS response yields were greater for plantations than for other harvest types. The TSS export significantly increased with discharge from plantations. The literature-based response periods used in this study were not fully monitored, and soil surface manipulations after harvesting pose a significant influence on sediment export in the United States.
    Schlagwörter best management practices ; harvesting ; hydrologic factors ; logging ; losses from soil ; multivariate analysis ; nitrate nitrogen ; plantations ; rain ; sediment transport ; sediments ; soil ; statistical models ; streams ; suspended sediment ; total phosphorus ; water quality ; water quality analysis ; United States
    Sprache Englisch
    Erscheinungsverlauf 2019-05
    Umfang p. 634-644.
    Erscheinungsort The American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc.
    Dokumenttyp Artikel
    Anmerkung epub
    ZDB-ID 120525-0
    ISSN 1537-2537 ; 0047-2425
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    ISSN 0047-2425
    DOI 10.2134/jeq2018.04.0145
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  6. Artikel: Response of Drainage Water Quality to Fertilizer Applications on a Switchgrass Intercropped Coastal Pine Forest

    Muwamba, Augustine / Amatya, Devendra M / Chescheir, George M / Nettles, Jamie E / Appelboom, Timothy / Tollner, Ernest W / Ssegane, Hebert / Youssef, Mohamed A / Birgand, Francois / Callahan, Timothy

    Water. 2020 Apr. 29, v. 12, no. 5

    2020  

    Abstract: The objectives of this study were (1) to test the hypothesis that fertilizer applications do not increase nutrient fluxes on a switchgrass/pine forest (IC) when compared to a mature pine forest (MP) and (2) to evaluate post-fertilization (post-fert, 2014– ...

    Abstract The objectives of this study were (1) to test the hypothesis that fertilizer applications do not increase nutrient fluxes on a switchgrass/pine forest (IC) when compared to a mature pine forest (MP) and (2) to evaluate post-fertilization (post-fert, 2014–2016) fluxes of nitrogen (N) and phosphorus (P) on IC and compare them to those observed during switchgrass growth prior to fertilization (pre-fert, 2012–2014) and site preparation for switchgrass establishment (site prep, 2009–2012). Nitrogen and P were applied to IC, a paired pure switchgrass site (SG), and MP, each about 25 ha in size, in June 2014, and again in June 2015 for the IC and SG sites only. Nitrogen and P concentrations were measured biweekly and rainfall and drainage outflow were measured continuously. During post-fert, the mean N concentrations and total loads were lower (p < 0.05) in IC than in SG and MP. The mean NO₃-N concentration and loads in IC were lower during post-fert than during site prep. The post-fert phosphate concentrations in IC were lower than they were during pre-fert and site prep. Frequent N and P applications in IC did not significantly (α = 0.05) increase N and P fluxes, likely due to plant uptake and sorption on the acidic site.
    Schlagwörter Panicum virgatum ; coniferous forests ; drainage ; drainage water ; fertilizers ; nitrogen ; phosphates ; phosphorus ; rain ; site preparation ; sorption ; water quality
    Sprache Englisch
    Erscheinungsverlauf 2020-0429
    Erscheinungsort Multidisciplinary Digital Publishing Institute
    Dokumenttyp Artikel
    Anmerkung NAL-light
    ZDB-ID 2521238-2
    ISSN 2073-4441
    ISSN 2073-4441
    DOI 10.3390/w12051265
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  7. Artikel: Response of Nutrients and Sediment to Hydrologic Variables in Switchgrass Intercropped Pine Forest Ecosystems on Poorly Drained Soil

    Muwamba, Augustine / Amatya, Devendra M / Ssegane, Herbert / Chescheir, George M / Appelboom, Timothy / Nettles, Jamie E / Tollner, Ernest W / Youssef, Mohamed A / Walega, Andrzej / Birgand, Francois

    Water, air, and soil pollution. 2020 Sept., v. 231, no. 9

    2020  

    Abstract: In the present study, we examined the relationships between (1) N, P, total organic carbon (TOC), and total suspended sediment (TSS) each and stream flow and water table elevation, individually (2) N, P, and TOC, each and TSS, and (3) stream water C/N ... ...

    Abstract In the present study, we examined the relationships between (1) N, P, total organic carbon (TOC), and total suspended sediment (TSS) each and stream flow and water table elevation, individually (2) N, P, and TOC, each and TSS, and (3) stream water C/N ratios and stream flow in managed pine forests with various switchgrass treatments implemented on four watersheds in coastal North Carolina plain. The treatments included a young pine forest–natural understorey (27.5 ha), a young pine forest with switchgrass intercropped between pine rows replacing natural understorey (IC) (26.3 ha), a mature thinned pine forest (25.9 ha), and pure switchgrass (27.1 ha). Precipitation, flow, water table elevation, N, phosphate, TOC, and TSS concentrations were measured from November 2009 to June 2014 (switchgrass growth from May 2012 after site preparation (SP) that ended in April 2012). Relationships (α = 0.05) among water quality and hydrologic variables were examined using a Spearman rank correlation coefficient and the principal component analysis (PCA). Nitrogen concentrations on IC were positively correlated with flow during SP. The export of nutrients and sediment from this drained pine plantation forest intercropped with switchgrass was affected by changes in hydrological and biochemical processes regulating the formation and transport of different water quality constituents during both site preparation and pine and switch growth periods. The PCA showed strong interaction between the hydrological and biochemical processes.
    Schlagwörter Panicum virgatum ; air ; coniferous forests ; forest plantations ; nitrogen ; phosphates ; poorly drained soils ; principal component analysis ; sediments ; site preparation ; soil pollution ; stream flow ; streams ; suspended sediment ; total organic carbon ; understory ; water ; water quality ; water table ; North Carolina
    Sprache Englisch
    Erscheinungsverlauf 2020-09
    Umfang p. 458.
    Erscheinungsort Springer International Publishing
    Dokumenttyp Artikel
    Anmerkung NAL-AP-2-clean
    ZDB-ID 120499-3
    ISSN 1573-2932 ; 0049-6979 ; 0043-1168
    ISSN (online) 1573-2932
    ISSN 0049-6979 ; 0043-1168
    DOI 10.1007/s11270-020-04808-3
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  8. Artikel: Effects of Site Preparation for Pine Forest/Switchgrass Intercropping on Water Quality

    Muwamba, A / Amatya, D. M / Appelboom, T / Birgand, F / Chescheir, G.M / Nettles, J. E / Skaggs, R. W / Ssegane, H / Tian, S / Tollner, E.W / Youssef, M. A

    Journal of environmental quality. 2015 July, v. 44, no. 4

    2015  

    Abstract: A study was initiated to investigate the sustainability effects of intercropping switchgrass (Panicum virgatum L.) in a loblolly pine (Pinus taeda L.) plantation. This forest-based biofuel system could possibly provide biomass from the perennial energy ... ...

    Abstract A study was initiated to investigate the sustainability effects of intercropping switchgrass (Panicum virgatum L.) in a loblolly pine (Pinus taeda L.) plantation. This forest-based biofuel system could possibly provide biomass from the perennial energy grass while maintaining the economics and environmental benefits of a forest managed for sawtimber. Operations necessary for successful switchgrass establishment and growth, such as site preparation, planting, fertilizing, mowing and baling, may affect hydrology and nutrient runoff. The objectives of this study were (i) to characterize the temporal effects of management on nutrient concentrations and loadings and (ii) to use pretreatment data to predict those treatment effects. The study watersheds (∼25 ha each) in the North Carolina Atlantic Coastal Plain were a pine/switchgrass intercropped site (D1), a midrotation thinned pine site with natural understory (D2), and a switchgrass-only site (D3). Rainfall, drainage, water table elevation, nitrogen (total Kjedahl N, NH4–N, and NO3–N), and phosphate were monitored for the 2007–2008 pretreatment and the 2009–2012 treatment periods. From 2010 to 2011 in site D1, the average NO3–N concentration effects decreased from 0.18 to −0.09 mg L−1, and loads effects decreased from 0.86 to 0.49 kg ha−1. During the same period in site D3, the average NO3–N concentration effects increased from 0.03 to 0.09 mg L−1, and loads effects increased from −0.26 to 1.24 kg ha−1. This study shows the importance of considering water quality effects associated with intensive management operations required for switchgrass establishment or other novel forest-based biofuel systems.
    Schlagwörter ammonium nitrogen ; baling ; biofuels ; biomass ; coastal plains ; coniferous forests ; drainage ; ecosystem services ; energy ; grasses ; intercropping ; mowing ; nitrate nitrogen ; nitrogen ; nutrient content ; Panicum virgatum ; phosphates ; Pinus taeda ; planting ; rain ; runoff ; sawlogs ; site preparation ; understory ; water quality ; water table ; watersheds ; North Carolina
    Sprache Englisch
    Erscheinungsverlauf 2015-07
    Umfang p. 1263-1272.
    Erscheinungsort The American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc.
    Dokumenttyp Artikel
    Anmerkung epub
    ZDB-ID 120525-0
    ISSN 1537-2537 ; 0047-2425
    ISSN (online) 1537-2537
    ISSN 0047-2425
    DOI 10.2134/jeq2014.11.0505
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  9. Artikel: Effects of Site Preparation for Pine Forest/Switchgrass Intercropping on Water Quality.

    Muwamba, A / Amatya, D M / Ssegane, H / Chescheir, G M / Appelboom, T / Tollner, E W / Nettles, J E / Youssef, M A / Birgand, F / Skaggs, R W / Tian, S

    Journal of environmental quality

    2015  Band 44, Heft 4, Seite(n) 1263–1272

    Abstract: A study was initiated to investigate the sustainability effects of intercropping switchgrass ( L.) in a loblolly pine ( L.) plantation. This forest-based biofuel system could possibly provide biomass from the perennial energy grass while maintaining the ... ...

    Abstract A study was initiated to investigate the sustainability effects of intercropping switchgrass ( L.) in a loblolly pine ( L.) plantation. This forest-based biofuel system could possibly provide biomass from the perennial energy grass while maintaining the economics and environmental benefits of a forest managed for sawtimber. Operations necessary for successful switchgrass establishment and growth, such as site preparation, planting, fertilizing, mowing and baling, may affect hydrology and nutrient runoff. The objectives of this study were (i) to characterize the temporal effects of management on nutrient concentrations and loadings and (ii) to use pretreatment data to predict those treatment effects. The study watersheds (∼25 ha each) in the North Carolina Atlantic Coastal Plain were a pine/switchgrass intercropped site (D1), a midrotation thinned pine site with natural understory (D2), and a switchgrass-only site (D3). Rainfall, drainage, water table elevation, nitrogen (total Kjedahl N, NH-N, and NO-N), and phosphate were monitored for the 2007-2008 pretreatment and the 2009-2012 treatment periods. From 2010 to 2011 in site D1, the average NO-N concentration effects decreased from 0.18 to -0.09 mg L, and loads effects decreased from 0.86 to 0.49 kg ha. During the same period in site D3, the average NO-N concentration effects increased from 0.03 to 0.09 mg L, and loads effects increased from -0.26 to 1.24 kg ha. This study shows the importance of considering water quality effects associated with intensive management operations required for switchgrass establishment or other novel forest-based biofuel systems.
    Sprache Englisch
    Erscheinungsdatum 2015-07
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 120525-0
    ISSN 1537-2537 ; 0047-2425
    ISSN (online) 1537-2537
    ISSN 0047-2425
    DOI 10.2134/jeq2014.11.0505
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  10. Artikel: Use of mixed solvent systems to eliminate sorption of strongly hydrophobic organic chemicals on container walls.

    Muwamba, Augustine / Nkedi-Kizza, Peter / Rhue, Roy Dean / Keaffaber, Jeffrey J

    Journal of environmental quality

    2009  Band 38, Heft 3, Seite(n) 1170–1176

    Abstract: Strongly hydrophobic organic chemicals (SHOCs) can be defined as neutral organic chemicals that have soil organic carbon (OC) normalized sorption coefficient (K(OC)) >10,000. Sorption isotherms of SHOCs are normally measured in aqueous systems to ... ...

    Abstract Strongly hydrophobic organic chemicals (SHOCs) can be defined as neutral organic chemicals that have soil organic carbon (OC) normalized sorption coefficient (K(OC)) >10,000. Sorption isotherms of SHOCs are normally measured in aqueous systems to determine K(OC). Since SHOCs can adsorb on container walls leading to overestimation of K(OC), we used mixed solvent systems to characterize this potential error. Sorption coefficient (K(M)) and percent recovery (%R(M)) of anthracene, DDT, and dieldrin during sorption on centrifuge tubes made of polytetrafluoroethylene (PTFE), polycarbonate (PC), polypropylene copolymer (PPCO), and glass high pressure liquid chromatography vials (HPLCV) were measured in volume ratio-varied methanol-water mixtures until 100% recovery of the sorbate was achieved. The data were evaluated using the Solvophobic theory. The K(M) values of the entire test SHOCs decreased exponentially with increasing fraction of methanol (f(c)). For sorption on PTFE, 100% recovery of the three chemicals was at f(c) > 0.45. However, 100% recovery of DDT and anthracene from PC and PPCO was at f(c) > 0.90. The 100% recovery of dieldrin from HPLC vials was at f(c) > 0.70. In water the calculated recoveries of DDT, dieldrin, and anthracene from PTFE were 32, 43, and 48%, respectively. However, the recoveries of dieldrin from HPLC vials and DDT and anthracene from PC and PPCO ranged from 2 to 14%. The data demonstrate that sorption on container walls is a source of error that can reduce the integrity of the analyte and might be one of the causes for the large variability in literature K(OC) values for SHOCs.
    Mesh-Begriff(e) Adsorption ; Anthracenes/chemistry ; Calcium Chloride/chemistry ; DDT/chemistry ; Dieldrin/chemistry ; Hydrophobic and Hydrophilic Interactions ; Methanol/chemistry ; Polycarboxylate Cement/chemistry ; Polypropylenes/chemistry ; Polytetrafluoroethylene/chemistry ; Solvents/chemistry
    Chemische Substanzen Anthracenes ; Polycarboxylate Cement ; Polypropylenes ; Solvents ; polycarbonate (25766-59-0) ; Polytetrafluoroethylene (9002-84-0) ; DDT (CIW5S16655) ; anthracene (EH46A1TLD7) ; Dieldrin (I0246D2ZS0) ; Calcium Chloride (M4I0D6VV5M) ; Methanol (Y4S76JWI15)
    Sprache Englisch
    Erscheinungsdatum 2009-05
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 120525-0
    ISSN 1537-2537 ; 0047-2425
    ISSN (online) 1537-2537
    ISSN 0047-2425
    DOI 10.2134/jeq2008.0123
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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