Journal article
Dissolved inorganic and organic carbon export from tile-drained midwestern agricultural systems
The Science of the total environment, Vol.883, pp.163607-163607
04/23/2023
DOI: 10.1016/j.scitotenv.2023.163607
PMID: 37098395
Abstract
While carbon is a critically important natural element cycling through the soil profile of agricultural systems, few studies have examined the flux of dissolved organic carbon (OC) and inorganic carbon (IC) through artificially-drained cropped fields. In this study, we monitored eight tile outlets, nine groundwater wells and the receiving stream during a March to November period in 2018 to quantify subsurface IC and OC flux from tiles and groundwater to a perennial stream from a single cropped field in north-central Iowa. Results showed that carbon export from the field was dominated by IC losses through subsurface drainage tiles that were 20× higher than dissolved OC concentration in tiles, groundwater and in Hardin Creek. IC loads from tiles comprised approximately 96 % of the total carbon export. Detailed soil sampling within the field quantified TC stocks to a 1.2 m depth (246,514 kg/ha), and based on the maximum annual rate of IC loss from the field (553 kg/ha per year), we estimated that approximately 0.23 % of the TC content (0.32 % of the TOC content and 0.70 % of the TIC content) of the shallow soils was lost in a single year. Loss of dissolved carbon from the field is likely offset by reduced tillage and additions of lime. Study results suggest that attention should be given to improved monitoring of aqueous total carbon export from fields for accurate accounting of carbon sequestration performance.
Details
- Title: Subtitle
- Dissolved inorganic and organic carbon export from tile-drained midwestern agricultural systems
- Creators
- Keith E Schilling - Iowa Geological Survey, University of Iowa, Iowa City, IA, United States of America. Electronic address: keith-schilling@uiowa.eduMatthew T Streeter - University of IowaChristopher S Jones - University of IowaPeter J Jacobson - Grinnell College
- Resource Type
- Journal article
- Publication Details
- The Science of the total environment, Vol.883, pp.163607-163607
- DOI
- 10.1016/j.scitotenv.2023.163607
- PMID
- 37098395
- ISSN
- 0048-9697
- eISSN
- 1879-1026
- Language
- English
- Date published
- 04/23/2023
- Academic Unit
- Earth and Environmental Sciences; IIHR--Hydroscience and Engineering
- Record Identifier
- 9984400160302771
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