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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Soil property trends and classification of alluvial floodplains, South Carolina Coastal Plain
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Soil property trends and classification of alluvial floodplains, South Carolina Coastal Plain

机译：南卡罗来纳沿海平原南卡罗来拓的土壤财产趋势与分类

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摘要

Alluvial soils derived from sediments of Piedmont origin occur in the Atlantic Coastal Plain of the southeastern U.S. In South Carolina, high-order rivers receiving sediment are Savannah (SV), Congaree (CN), Wateree (WA), Santee (ST), Lynches (LY), and Great Pee Dee (PD). This study investigated distribution of soil properties on natural levee, valley flat, and backswamp landforms within and among the six river floodplains and compared results to the taxonomic classifications used historically during soil survey production. This study also investigated the contribution of sediment sources to soil characteristics. Data were compiled for 65 soil pedons sampled from 16 soil survey areas during a 41-year time period. Pedons were located in three Major Land Resource Areas (MLRAs), and the results should aid in development of both land resource area and ecological site concepts. Data analyses centered on clay and silt contents, mineralogy, base saturation (BS), and cation exchange activity (CEA) classes. Evaluation of data from the six river floodplains revealed common properties among soils on fluvial landscapes across multiple MLRAs. Four soil systems, each derived from a predominant rock type, composed the Piedmont drainage basin of each river. The absolute area of each soil system differed between rivers, but sediment supplied typically did not result in great soil texture variation per landform. The land area proportion of the Carolina Slate Belt soil system had a close relationship to silt contents of the alluvial soils. On the valley flat landform of five floodplains, particle-size control section (PSCS) median clay content ranged only between 302 g kg(-1) and 405 g kg(-1). Among all valley flats median PSCS silt content ranged between 361 g kg(-1) and 511 g kg(-1). Slight positive downriver trends for clay were observed on SV, WA, and PD and for silt on SV and WA. Although local BS variation could be high between pedons, slight positive downriver BS trends on valley flats were observed on SV, WA, and ST. Negative BS trends were seen on LY and PD. Kaolinite was the dominant clay mineral in soils of all landforms on the six floodplains. Weatherable primary minerals in sand and silt fractions resulted in higher BS except for the LY soils, where resistant minerals composed sand and silt fractions. The semiactive CEA class occurred predominantly on all three landforms. Taxonomic analysis supported soil assignment to the suborders Aquepts or Udepts on all floodplains. Great group level Eutrudepts in South Carolina are first reported here, and they occur extensively enough on SV, CN, WA, and PD to warrant recognition in soil map units. Because most soil properties showed little variability for soils occurring in floodplains for all six rivers, botanical assessments will be needed to determine the magnitude of the role the properties have toward defining ecological sites. Ultimately, the alluvial systems may be aggregated as a single land resource area within the Coastal Plain.
机译：来自皮埃蒙特原产地沉积物的冲积土壤出现在南卡罗来纳州东南部的大西洋沿海平原中，高阶河流接收沉积物是大草原（SV），Congaree（CN），Wateree（WA），Santee（ST），Lynches （LY）和Great Pee Dee（PD）。本研究调查了六河洪泛平原内部内部和背后地貌的土壤性质分布，并在土壤调查生产中与历史上使用的分类分类进行了比较的结果。本研究还调查了沉积物来源对土壤特征的贡献。在41年期间，为16个土壤调查区采样的65个土壤施用数据编制了数据。佩顿位于三大土地资源领域（MLRAS），结果应有助于开发土地资源区和生态站点概念。以粘土和淤泥含量，矿物学，基础饱和度（BS）和阳离子交换活动（CEA）类为中心的数据分析。六河洪泛区的数据评估跨多个MLRAS的河流景观中的土壤中的常见特性。四种土壤系统，每个源自主要的岩石类型，组成了每条河流的皮埃蒙特排水盆地。河流之间的每种土壤系统的绝对区域不同，但沉积物通常不会导致每个地貌的土壤质地变化很大。 Carolina Slate带土系统的土地面积比例与冲积土壤的淤泥含量密切相关。在五个泛洪平的谷平面地貌上，粒度控制部分（PSC）中值粘土含量范围仅在302g kg（-1）和405g kg（-1）之间。在所有谷平板中，PSC淤泥含量在361g kg（-1）和511g kg（-1）之间。在SV，WA和Pd上观察到粘土的轻微正下流动趋势，并在SV和WA上淤泥。虽然临床之间的本地BS变化可能很高，但在SV，WA和ST上观察到谷平面上的轻微正向下降趋势。在ly和pd上看到了负面bs趋势。高岭石是六个洪泛平原的所有地形的土壤中的主要粘土矿物。除了含量的土壤外，耐磨砂和淤泥分数中的耐候初级矿物质导致较高的BS，其中耐矿物组成的沙子和淤泥馏分。半导体CEA课程主要发生在所有三个地貌上。分类分析分析支持所有洪水上的副视点或大学的土壤分配。南卡罗来纳州的伟大群体级别在此报告，它们在SV，CN，WA和PD上广泛地发生，以在土壤地图单元中保证识别。由于大多数土壤性质对所有六条河流发生洪泛灌溉发生的土壤的差异很小，因此需要植物评估来确定性质朝向定义生态位点的作用的程度。最终，冲积系统可以作为沿海平原内的单个土地资源区域聚合。

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