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首页> 外文期刊>Wetlands >Improving Hydric Soil Identification in Areas Containing Problematic Red Parent Materials: a Nationwide Collaborative Mapping Approach
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Improving Hydric Soil Identification in Areas Containing Problematic Red Parent Materials: a Nationwide Collaborative Mapping Approach

机译：在含有问题的红色母体材料的区域中改善水生土壤的识别：全国范围的协作制图方法

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摘要

Hydric soil identification utilizes diagnostic morphologic features, including iron transformations, resulting from anaerobic conditions. However, soils derived from some red parent materials (RPM) fail to develop characteristic hydric soils morphologies, confounding hydric soil and wetland delineation. Laboratory and field methods addressing resistant RPM soils exist, but application remains limited by uncertainty regarding problematic RPM distribution. In response, a collaborative effort (>50 participants) documented problematic RPM distribution across the contiguous United States. Specifically, >1100 samples from >450 locations underwent laboratory analysis using the Color Change Propensity Index to identify problematic RPM soils. Geospatial analysis linked verified problematic soils with associated geologic units and soil series, generating maps of RPM distribution. Potential problematic RPM was identified in the Northeast and Mid-Atlantic, Great Lakes, South-central, and Desert Southwest-Western Mountains (problematic RPM regions herein), encompassing diverse groups of soils and parent materials. Despite the observed variability in soil characteristics, results suggest that problematic RPM was consistently derived from sedimentary, hematite-rich red bed formations developed where deposition of terrestrial sediments occurred in near-shore, marginal-marine environments. Understanding problematic RPM soils distribution promotes the appropriate application of existing hydric soil field indicators, including F21 - Red Parent Material, thus improving approaches to hydric soil identification and wetland management.
机译：亲水性土壤鉴定利用了厌氧条件下的诊断形态特征，包括铁转化。然而，源自某些红色母体材料（RPM）的土壤无法形成特征性的水土形态，从而混淆了水土和湿地的轮廓。存在解决抗RPM土壤的实验室和野外方法，但是由于存在问题的RPM分布的不确定性，其应用仍然受到限制。作为回应，一个合作努力（> 50名参与者）记录了整个美国连续的RPM分配问题。具体来说，使用颜色变化倾向指数对来自450多个地点的1100多个样本进行了实验室分析，以识别有问题的RPM土壤。地理空间分析将经过验证的有问题的土壤与相关的地质单位和土壤序列联系起来，生成RPM分布图。在东北和大西洋中部，大湖区，中南部和沙漠西南西南山区（此处是有问题的RPM地区），确定了潜在的有问题的RPM，其中包括各种土壤和母体。尽管观测到的土壤特征具有变化性，但结果表明，有问题的RPM始终来自沉积的，富含赤铁矿的红层地层，在近岸边缘海洋环境中发生了陆地沉积物的沉积。了解有问题的RPM土壤分布可促进适当使用现有的含羟基土壤田间指标，包括F21-红色母体材料，从而改善含羟基土壤识别和湿地管理的方法。

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