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Soil Conditions Following Hydrologic Restoration in Cypress Dome Wetlands

机译：柏树穹顶湿地水文恢复后的土壤条件

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摘要

Soil characteristics and decomposition rates were investigated in 12 geographically isolated wetlands (cypress domes) across a gradient of hydrologic alteration (altered, marginally altered and least altered sites) seven years after passive recovery from historic groundwater withdrawals. Above- and belowground decomposition rates were determined in transition (seasonally flooded) and outer deep (semi-permanently) hydrologic zones. Flood duration, frequency, redox conditions, pH, and soil organic matter were measured to potentially explain patterns across the alteration gradient. Despite the reduction in groundwater withdrawals, altered sites exhibited fewer days of inundation in transition and outer deep zones compared to marginally altered and least altered wetlands. Over a 56week period, altered wetlands displayed greater decomposition in the aboveground outer deep zone (73.3 +/- 4.0% mass remaining) and in the belowground transition zone (62.0 +/- 4.5% mass remaining) compared to marginally and least altered sites. Analyses indicated that marginally altered wetlands were more comparable to least altered wetlands however differences in altered wetland soils (including decomposition) persist. Although wetland hydrology has been partially restored, additional time and/or further site augmentation may be needed for altered sites to be functionally equivalent to least altered wetlands and in some cases (e.g., excessive subsidence) the degree of past alteration may limit restoration potential.
机译：从历史性地下水抽取被动恢复七年后，在12个地理上隔离的湿地（柏树穹顶）中，在一定的水文变化（变化，边缘变化和变化最小的地点）上调查了土壤特征和分解速率。确定了过渡期（季节性淹没）和外深部（半永久性）水文区的地上和地下分解速率。测量洪水持续时间，频率，氧化还原条件，pH值和土壤有机质，以潜在地解释整个变化梯度的模式。尽管减少了地下水抽取量，但与微幅变化和最少变化的湿地相比，变化的地点在过渡区和外部深区的淹没天数更少。在56周的时间内，相比边缘和变化最小的地点，改变的湿地在地上外部深层区域（剩余质量为73.3 +/- 4.0％）和地下过渡区域（剩余质量为62.0 +/- 4.5％）显示出更大的分解。分析表明，略有改变的湿地与最少改变的湿地具有更高的可比性，但是改变后的湿地土壤（包括分解）的差异仍然存在。尽管湿地水文学已部分恢复，但可能需要更多时间和/或进一步增加位置，以使改变后的位置在功能上等同于改变最少的湿地，并且在某些情况下（例如过度沉陷），过去改变的程度可能会限制恢复潜力。

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  • 来源
    《Wetlands》 |2019年第1期|185-196|共12页
  • 作者

    Bartholomew Megan K.; Anderson Christopher J.; Berkowitz Jacob;

  • 作者单位

    Auburn Univ, Sch Forestry & Wildlife Sci, Auburn, AL 36849 USA|US Army, Corps Engineers, Engineer Res & Dev Ctr, Vicksburg, MS 39180 USA;

    Auburn Univ, Sch Forestry & Wildlife Sci, Auburn, AL 36849 USA|US Army, Corps Engineers, Engineer Res & Dev Ctr, Vicksburg, MS 39180 USA;

    Auburn Univ, Sch Forestry & Wildlife Sci, Auburn, AL 36849 USA|US Army, Corps Engineers, Engineer Res & Dev Ctr, Vicksburg, MS 39180 USA;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Decomposition; Wetland soils; Hydrologic recovery; Cypress domes; Wetland restoration;

    机译：分解;湿地土壤;水文恢复;柏穹顶;湿地恢复;

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