Mapping the occurrence and thickness of soil horizons within soil profiles
Mapping the occurrence and thickness of soil horizons within soil profiles
复制标题
绘制土壤剖面内土层的出现情况和厚度
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
B. Minasny
中科院分区：
文献类型：
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作者：
G. Gastaldi;B. Minasny
虽然许多研究已经绘制了单个土壤层的厚度，但很少有人将层作为整个土壤剖面绘制。我们开发的土壤景观回归模型来描述和预测的发生和厚度的几个土层1米深。这项研究是在澳大利亚新南威尔士州猎人谷的一个75平方公里的区域进行的，使用了1050个土壤剖面观测。用于制作模型的景观因素包括地形属性、土地利用和地质。我们推导出回归模型来预测个别土层的厚度。由于并非所有层位都能出现在整个区域，我们不能建立一个假设误差方差为常数的回归模型。因此，我们使用逻辑回归与普通回归的组合，首先对每个层位的出现进行建模，然后分别对其厚度进行建模。该模型揭示了土壤属性和预测的发生和厚度的每一个土壤层之间的显着关系。验证它和c）用不同的地图来表示它们。2材料和方法2.1研究区域和数据研究区域位于Pokolbin的猎人谷下游，面积约为75平方公里（图1）。气候温和。研究区域的海拔范围为55至500米。根据海拔高度，我们可以区分两个区域：西南部，坡度从15到30度不等，中部和东北部，坡度从0到5度不等。研究区土壤主要为粘壤土和轻粘土。根据澳大利亚土壤分类系统，土壤类别包括Dermosols和Chromosols。这些数据来自悉尼大学在2000年至2009年期间进行的各种调查，包括1050个土壤剖面。这些数据描述了根据澳大利亚分类的土壤（田地质地、不同土层的深度、颜色和形态）。为了进行研究，我们安排了收集的数据和理想化的土壤剖面模型。我们考虑了一个理想化的土壤剖面，它具有以下所有层位，按顺序使用澳大利亚层位名称：Ap，A1，A2，B1，B2，B3，BC和C。对土壤层位较低深度的原始数据进行了转换，
While many studies have mapped the thickness of individual soils horizons, few have mapped the horizons as a whole soil profile. We developed soil-landscape regression models to describe and predict the occurrence and the thickness of several soil horizons to 1 m depth. The study was carried out at a 75 km2 area in the Hunter Valley, New South Wales in Australia, using 1050 soil profiles observations. The landscape factors that were used to make the models included terrain attributes, landuse, and geology. We derived regression models to predict the thickness of the individual soil horizons. Because not all horizons can be present in the whole area, we cannot develop a regression model which has the assumption of constant error variance. Therefore, we used a combination of a logistic regression with an ordinary regression to first model the occurrence of each horizon and then their thickness, respectively. This model revealed significant relations between the soil attributes and the prediction of the occurrence and thickness of each of the soil horizons. validate it and c) to represent them with different maps. 2 MATERIALS AND METHODS 2.1 Study area and data The study area is in the lower Hunter Valley, Pokolbin with an area of approximately 75 km2 (Figure 1). The climate is temperate. Elevation in the study areas ranged from 55 to 500 m. Based on the elevation, we can distinguish two zones: southwest where the slope ranged from 15 to 30 degrees and the middle and north-east where the slope ranged from 0 to 5 degrees. The soils in the study area are mainly clay loams and light clays. The soil class includes Dermosols and Chromosols according to the Australian Soil Classification System. The data came from various surveys conducted by the University of Sydney from 2000 to 2009, consisting of 1050 soil profiles. The data described the soil according to the Australian classification (field texture, depth of the different horizons, colour, and morphologies). In order to conduct the study, we arranged the data collected and idealized a soil profile model. We considered an idealized soil profile which has all of the following horizons in a sequential order using the Australian horizon designation: Ap, A1, A2, B1, B2, B3, BC and C. We converted the raw data of soil horizon lower depth