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Biogeochemistry

, Volume 142, Issue 3, pp 339–356 | Cite as

Soils in transition: saltwater intrusion alters soil chemistry in agricultural fields

  • Katherine L. TullyEmail author
  • Danielle Weissman
  • W. Jesse Wyner
  • Jarrod Miller
  • Thomas Jordan
Article

Abstract

As global sea-levels rise, low-lying coastal lands are subject to shallow coastal flooding and saltwater intrusion, affecting the productivity of farmlands worldwide. Soil biogeochemistry can be dramatically altered as saltwater intrudes agricultural fields. We selected three farm fields in Somerset Co., Maryland affected by saltwater intrusion and established transects from the ditch bank to the center of the cropped field and collected soils (to ~ 140 cm) at five points along this transect. The three fields in this study have different soil types, are located along different tributaries in the county, and receive different fertilizer rates, yet they all showed similar biogeochemical responses to saltwater intrusion. We found an increase in electrical conductivity and concentrations of chloride, sulfate, and forms of phosphorus (P) from the center of the field (low) to the ditch banks (high). As inundation increased, the structure of iron (Fe) changed from crystalline to non-crystalline forms, possibly due to dissolution under saturated conditions. Near the edges of the fields, the formation of organometallic complexes was positively associated with increases in soil carbon and organic soil P concentrations. Compared to areas of the fields where crops were actively growing, soil P concentrations are 2–3 higher on field edges, suggesting that saltwater intrusion may be transporting P to the edges of agricultural fields. These field edges are frequently saturated, thus reduction of Fe could lead to P release into solution potentially harming water quality. As climate change pushes saltwater further inland, it is important to understand the biogeochemical consequences for ecosystems up- and downstream. Understanding the how fractions of P move and change across fields affected by saltwater intrusion will be crucial for planning current and future management of coastal agricultural lands.

Keywords

Saltwater intrusion Agriculture Chesapeake Bay Phosphorus Carbon Iron Aluminum 

Notes

Acknowledgements

This work was supported by several funding sources: a Seed Grant through the University of Maryland National Science Foundation-ADVANCE Institutional Transformation grant (Grant No. HRD-1008117); a USDA National Institute for Food and Agriculture (NIFA) Integrated Agriculture and Natural Resources Extension and Research Program Grant administered through the University of Maryland (Project No. MD-PSLA-18496/Project Accession No. 1016911); a grant from the USDA NIFA Resilient Agroecosystems in a Changing Climate Challenge Area (Grant No. 12451226/Project Accesion No. 1015143); and a Maryland Sea Grant Coastal Resilience and Sustainability Fellowship (Grant No. 20171-002). We would like to thank all of the interns in the Agroecology lab who worked tirelessly on this project. Finally, we are indebted to the farmers of Somerset County, who have been so gracious with their time and land.

Supplementary material

10533_2019_538_MOESM1_ESM.eps (6.2 mb)
Electronic supplementary material 1 (EPS 6328 kb)
10533_2019_538_MOESM2_ESM.docx (63 kb)
Electronic supplementary material 2 (DOCX 63 kb)
10533_2019_538_MOESM3_ESM.xlsx (28 kb)
Electronic supplementary material 3 (XLSX 28 kb)

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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Plant Science and Landscape ArchitectureUniversity of MarylandCollege ParkUSA
  2. 2.University of Maryland ExtensionPrincess AnneUSA
  3. 3.University of Delaware, Plant and Soil Sciences, Carvel Research and Education CenterGeorgetownUSA
  4. 4.Smithsonian Environmental Research CenterEdgewaterUSA
  5. 5.Department of Environmental Science and TechnologyUniversity of MarylandCollege ParkUSA

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