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首页> 外文期刊>Soil Science Society of America Journal >Human-Transported Material Soils of Urbanizing Estuarine Landscapes
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Human-Transported Material Soils of Urbanizing Estuarine Landscapes

机译：人口化的城市化河口景观物质土壤

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Additions of human-transported materials (HTM) have significantly altered many coastal shorelines and wetlands. The hydrology and the ability of these anthropogenic soils to support ecologically important functions is poorly understood. In this study, we documented soil hydrologic patterns along disturbed estuarine shorelines and wetlands. Our goal was to determine if the soils had properties relative to the potential to support denitrification (i.e., labile C, saturation, and reducing conditions). Eleven anthropogenic sites, located in Rhode Island and 30 to >60 yr old, were studied. Auger transects were completed to characterize anthropogenic soils. Water table levels were monitored twice a month. Anthropogenic soils were described and sampled from pits at five representative locations. Soil organic C (SOC), permanganate-oxidizable C (POC), bulk density, and pH were measured. Deposits of HTM, comprised of dredge and fill materials, ranged in thickness from 26 to >285 cm, were predominantly sandy and often contained artifacts. In the thickest HTM deposits, water table levels rose as much as 2.5 m above the original buried soil surface. Redoximorphic features were identified within the range of water table activity in 16 of the 18 monitored anthropogenic soils, suggesting reducing conditions. Soil organic C ranged from 1.6 to 88.9 g kg super(-1), was highest in surface horizons, and had an irregular distribution with depth. Labile C, estimated from POC measurements, followed the SOC distribution. Evidence of labile C, saturation, and reducing conditions in the majority of these soils suggest that most of the disturbed estuarine soils we studied have the capacity for denitrification.
机译：增加人类运输的材料（HTM）已大大改变了许多沿海海岸线和湿地。这些人为土壤支持生态重要功能的水文和能力知之甚少。在这项研究中，我们记录了沿受干扰的河口海岸线和湿地的土壤水文模式。我们的目标是确定土壤是否具有与支持反硝化作用的潜力相关的特性（即，不稳定的碳，饱和度和还原条件）。研究了位于罗得岛（Rhode Island）且有30至60年历史的11个人类活动场所。俄歇断面已完成，以表征人为土壤。每月两次监测地下水位。描述了人为土壤并从五个代表性地点的矿坑中取样。测量土壤有机碳（SOC），高锰酸盐可氧化碳（POC），堆积密度和pH。 HTM的沉积物由疏edge和填充材料组成，厚度从26到> 285 cm不等，主要是沙质，经常含有人工产物。在最厚的HTM矿床中，地下水位比原始埋藏的土壤表面高出2.5 m。在18种被监测的人为土壤中，有16种在地下水位活动范围内发现了氧化还原形态特征，表明土壤还原性条件。土壤有机碳含量范围为1.6至88.9 g kg super（-1），在地表水平最高，且随深度分布不规则。通过POC测量估算的不稳定C遵循SOC分布。这些土壤大多数中不稳定的碳，饱和度和还原性条件的证据表明，我们研究的大多数受干扰的河口土壤都具有反硝化能力。

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