Wetlands

, Volume 29, Issue 1, pp 372–386

The legacy of wetland drainage on the remaining peat in the Sacramento — San Joaquin Delta, California, USA

  • Judith Z. Drexler
  • Christian S. de Fontaine
  • Steven J. Deverel
Article

Abstract

Throughout the world, many extensive wetlands, such as the Sacramento-San Joaquin Delta of California (hereafter, the Delta), have been drained for agriculture, resulting in land-surface subsidence of peat soils. The purpose of this project was to study the in situ effects of wetland drainage on the remaining peat in the Delta. Peat cores were retrieved from four drained, farmed islands and four relatively undisturbed, marsh islands. Core samples were analyzed for bulk density and percent organic carbon. Macrofossils in the peat were dated using radiocarbon age determination. The peat from the farmed islands is highly distinct from marsh island peat. Bulk density of peat from the farmed islands is generally greater than that of the marsh islands at a given organic carbon content. On the farmed islands, increased bulk density, which is an indication of compaction, decreases with depth within the unoxidized peat zone, whereas, on the marsh islands, bulk density is generally constant with depth except near the surface. Approximately 55–80% of the original peat layer on the farmed islands has been lost due to land-surface subsidence. For the center regions of the farmed islands, this translates into an estimated loss of between 2900–5700 metric tons of organic carbon/hectare. Most of the intact peat just below the currently farmed soil layer is over 4000 years old. Peat loss will continue as long as the artificial water table on the farmed islands is held below the land surface.

Key Words

bulk density compaction marsh microbial oxidation organic carbon radiocarbon age determination subsidence 

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Copyright information

© Society of Wetland Scientists 2009

Authors and Affiliations

  • Judith Z. Drexler
    • 1
  • Christian S. de Fontaine
    • 1
  • Steven J. Deverel
    • 2
  1. 1.California Water Science CenterU. S. Geological SurveySacramentoUSA
  2. 2.Hydrofocus, Inc.DavisUSA

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