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首页> 外文学位 >A MODEL FOR EVALUATING DIFFERENTIATING CHARACTERISTICS OF THE COLO SOILS AS MAPPED IN THE NORTH CENTRAL REGION.
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A MODEL FOR EVALUATING DIFFERENTIATING CHARACTERISTICS OF THE COLO SOILS AS MAPPED IN THE NORTH CENTRAL REGION.

机译：中北部地区彩色土壤微分特征评估模型。

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摘要

The Colo soil series (fine-silty, mixed, mesic Cumulic Haplaquoll) was studied as mapped in the North Central Region (NCR). Within this broad geographic area there are variations in climate, vegetation, parent material, relief, and time--the five soil forming factors. The majority of the Colo soil profiles studied (located on floodplains of streams of varying size) were collected at the type location for the Colo series in the county soil survey. Forty-seven soil profiles were described and sampled to determine selected physical, chemical, and mineralogical properties of the Colo soil. A limited amount of data for soils derived from alluvial sediments is available. This investigation studied one soil series and characterized the series as mapped, compared soil and landscape parameters relative to the Colo soil, and developed a model to better understand the genesis of soils derived from alluvial sediments in the NCR.; Chemical and physical depth distributions of selected properties in some profiles indicated some degree of horizon differentiation. Clay depth distributions were either a straight line or a curve which increased systematically with depth to a maximum (illuviated zone) then decreased, indicating little particle size stratification. B/A and subsurface/surface (sub/sur) clay ratios ranged from 1.7 to .9. Total phosphorus (TP) and inorganic phosphorus (IP) depth distributions in many profiles had a zone of eluviation and illuviation indicating redistribution of phosphorus in the profile. This could be interpreted that the soils are on landforms that have been stable for some period of time. Total carbon (TC) content usually increased regularly with increasing depth. In some profiles the TC increased with depth to a maximum then decreased with increasing depth. Recent sediments with relatively low amounts of TC were present in the upper part of some profiles.; Statistical model equations involving several physical, chemical, mineralogical, and landscape parameters as dependent or independent variables were developed. The statistical model developed with chemical and physical data for all observations that had the highest R('2) (.72) had TC as the dependent variable and TP, IP, organic phosphorus/total phosphorus and organic carbon/organic phosphorus as independent variables. Another model, significant at the 1% level, predicted the relationship of clay, TC, AVP (available phosphorus), and HION (hydrogen ion activity in moles/liter) to TP. Weighted averages of the physical and chemical data were also used in model equations. Models using other soil and landscape vairables such as the type of clay minerals present, longitude, latitude, climatic data, width of the floodplain, parent material, vegetation, and slope and erosion class of the associated upland soils were indexed to determine relationships among these variables.; Clay mineralogical analyses indicated a dominance of interstratified clay minerals while montmorillonite, kaolinite-chlorite, and illite were minor clay minerals as interpreted from relative peak heights. The types of clay minerals did not change but relative peak heights did change with depth in the profile.
机译：根据北部中部地区（NCR）的地图，研究了Colo土壤系列（细粉质，混合，中性Cumulic Haplaquoll）。在这个广阔的地理区域内，气候，植被，母体材料，起伏和时间（这五个土壤形成因素）都有变化。在县土壤调查中，大多数Colo土壤剖面（位于大小不同的河滩上）都是在Colo系列的类型位置处收集的。描述并取样了47个土壤剖面，以确定科洛土壤的选定物理，化学和矿物学性质。关于冲积沉积物的土壤的数据有限。这项研究研究了一个土壤序列，并对其进行了特征描述，比较了相对于Colo土壤的土壤和景观参数，并开发了一个模型，以更好地了解NCR中冲积沉积物产生的土壤的成因。在某些剖面中选定特性的化学和物理深度分布表明一定程度的水平差异。粘土的深度分布是一条直线或一条曲线，随着深度的增加而系统地增加，达到最大值（不饱和区域），然后减小，表明几乎没有粒度分层。 B / A和地下/地下（地下/地下）粘土比范围为1.7至.9。许多剖面中的总磷（TP）和无机磷（IP）深度分布都有一个洗脱带和溶蚀带，表明剖面中磷的重新分布。这可以解释为土壤处于一段时间稳定的地貌上。总碳（TC）含量通常随着深度的增加而有规律地增加。在某些剖面中，TC随深度增加到最大，然后随深度增加而减小。在某些剖面的上部，出现了TC含量相对较低的近期沉积物。建立了涉及几个物理，化学，矿物学和景观参数作为因变量或自变量的统计模型方程。对于所有具有最高R（'2）（.72）观测值的化学和物理数据建立的统计模型，以TC为因变量，以TP，IP，有机磷/总磷和有机碳/有机磷为自变量。另一个模型的显着性为1％，它预测了粘土，TC，AVP（有效磷）和HION（氢离子活性，以摩尔/升计）与TP的关系。物理和化学数据的加权平均值也用于模型方程式。使用其他土壤和景观变化模型（例如存在的粘土矿物的类型，经度，纬度，气候数据，洪泛区的宽度，母体材料，植被以及相关的旱地土壤的坡度和侵蚀类别）进行索引，以确定这些关系变量。粘土矿物学分析表明，层状粘土矿物占主导地位，而蒙脱石，高岭石-绿泥石和伊利石是次要的粘土矿物，从相对峰高上可以看出。粘土矿物的类型没有变化，但相对峰高却随剖面深度的变化而变化。

著录项

  • 作者

    COLLINS, MARY ELIZABETH.;

  • 作者单位

    Iowa State University.;

  • 授予单位 Iowa State University.;
  • 学科 Agriculture Agronomy.; Geological Survey.
  • 学位 Ph.D.
  • 年度 1980
  • 页码 439 p.
  • 总页数 439
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农学（农艺学）;
  • 关键词

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