| 美国路易斯安那州铁矿石土壤薄层磐层的表征特性 |
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| 作者姓名： | D. C. WEINDORF N. BAKR Y. ZHU B. HAGGARD S. JOHNSON J. DAIGLE |
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| 作者单位： | Louisiana State University Agricultural Center, 307 MB Sturgis Hall, Baton Rouge, LA 70803 (USA);Louisiana State University Agricultural Center, 307 MB Sturgis Hall, Baton Rouge, LA 70803 (USA);Louisiana State University Agricultural Center, 307 MB Sturgis Hall, Baton Rouge, LA 70803 (USA);Louisiana State University Agricultural Center, 307 MB Sturgis Hall, Baton Rouge, LA 70803 (USA);Louisiana State University Agricultural Center, 307 MB Sturgis Hall, Baton Rouge, LA 70803 (USA);United States Department of Agriculture–Natural Resources Conservation Service, 3737 Government Street, Alexandria, LA 71302 (USA) |
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| 基金项目： | *1Supported by the LSU AgCenter, USA. |
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| 摘 要： | Placic horizons, defined as thin, wavy, hardened layers of iron and organic matter, are rare within the United States, occurring only in Washington, Alaska, and Hawaii. While ironstone is common in many soils of the southeastern United States, it is not known to contain appreciable organic matter. As a pilot study evaluating the justification for a larger study on ironstone in Louisiana, a 40 m lateral exposure with suspected placic horizons was evaluated in Vernon Parish, Louisiana. Results of laboratory analysis show elevated levels of iron and organic matter in the suspect horizons that meet the criteria of placic horizons as defined by the Soil Survey Staff. Based on the results of this study, additional evaluation of multiple pedons with similar features is warranted. Should additional pedons demonstrate similar properties, a new great group of ‘Petrudepts’ would be needed to describe both the placic horizons in the pedon and the udic moisture regime in which they occur.
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| 关 键 词： | 路易斯安那州 美国东南部 土壤调查 胶层 表征 试验评估 水分状况 实验室分析 |
| 收稿时间： | 12 March 2010 |
Characterization of placic horizons in ironstone soils of Louisiana, USA |
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| D. C. WEINDORF,N. BAKR,Y. ZHU,B. HAGGARD,S. JOHNSON,J. DAIGLE.Characterization of placic horizons in ironstone soils of Louisiana, USA[J].Pedosphere,2010,20(4):409-418. |
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| Authors: | D C WEINDORF N BAKR Y ZHU B HAGGARD S JOHNSON and J DAIGLE |
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| Institution: | Louisiana State University Agricultural Center, 307 MB Sturgis Hall, Baton Rouge, LA 70803 (USA);Louisiana State University Agricultural Center, 307 MB Sturgis Hall, Baton Rouge, LA 70803 (USA);Louisiana State University Agricultural Center, 307 MB Sturgis Hall, Baton Rouge, LA 70803 (USA);Louisiana State University Agricultural Center, 307 MB Sturgis Hall, Baton Rouge, LA 70803 (USA);Louisiana State University Agricultural Center, 307 MB Sturgis Hall, Baton Rouge, LA 70803 (USA);United States Department of Agriculture-Natural Resources Conservation Service, 3737 Government Street, Alexandria, LA 71302 (USA) |
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| Abstract: | Placic horizons, defined as thin, wavy, hardened layers of iron and organic matter, are rare within the United States, occurring only in Washington, Alaska, and Hawaii. While ironstone is common in many soils of the southeastern United States, it is not known to contain appreciable organic matter. As a pilot study evaluating the justification for a larger study on ironstone in Louisiana, a 40 m lateral exposure with suspected placic horizons was evaluated in Vernon Parish, Louisiana. Results of laboratory analysis show elevated levels of iron and organic matter in the suspect horizons that meet the criteria of placic horizons as defined by the Soil Survey Staff. Based on the results of this study, additional evaluation of multiple pedons with similar features is warranted. Should additional pedons demonstrate similar properties, a new great group of ‘Petrudepts’ would be needed to describe both the placic horizons in the pedon and the udic moisture regime in which they occur. |
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| Keywords: | ortstein petroferric contact pedon Petrudepts |
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