Optical in-situ sensors capture dissolved organic carbon (DOC) dynamics after prescribed fire in high-DOC forest watersheds

  • Authors: Olivares, Christopher I; Zhang, Wenbo; Uzun, Habibullah; Erdem, Cagri Utku; Majidzadeh, Hamed; Trettin, Carl; Karanfil, Tanju; Chow, Alex
  • Publication Year: 2019
  • Publication Series: Scientific Journal (JRNL)
  • Source: International Journal of Wildland Fire
  • DOI: 10.1071/wf18175

Abstract

Fires alter terrestrial dissolved organic carbon (DOC) exports into water, making reliable post-fire DOC monitoring a crucial aspect of safeguarding drinking water supply. We evaluated DOC optical sensors in a pair of prescribed burned and unburned first-order watersheds at the Santee Experimental Forest, in the coastal plain forests of South Carolina, and the receiving second-order watershed during four post-fire storm DOC pulses. Median DOC concentrations were 30 and 23 mg L1 in the burned and unburned watersheds following the first post-fire storm. Median DOC remained high during the second and third storms, but returned to pre-fire concentrations in the fourth storm. During the first three post-fire storms, sensor DOC load in the burned watershed was 1.22-fold higher than in the unburned watershed. Grab samples underestimated DOC loads compared with those calculated using the in-situ sensors, especially for the second-order watershed. After fitting sensor values with a locally weighted smoothing model, the adjusted sensor values were within 2 mg L1 of the grab samples over the course of the study. Overall, we showed that prescribed fire can release DOC during the first few post-fire storms and that in-situ sensors have adequate sensitivity to capture storm-related DOC pulses in high-DOC forest watersheds.

  • Citation: Olivares, Christopher I.; Zhang, Wenbo; Uzun, Habibullah; Erdem, Cagri Utku; Majidzadeh, Hamed; Trettin, Carl; Karanfil, Tanju; Chow, Alex. 2019. Optical in-situ sensors capture dissolved organic carbon (DOC) dynamics after prescribed fire in high-DOC forest watersheds. International Journal of Wildland Fire. 28(10): https://doi.org/10.1071/wf18175.
  • Keywords: first-order watershed, forest management, prescribed burn, Santee Experimental Forest, South Carolina
  • Posted Date: September 8, 2020
  • Modified Date: September 10, 2020
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