Journal of Soils and Sediments

, Volume 18, Issue 4, pp 1756–1766 | Cite as

Sediment delivery and nutrient export as indicators of soil sustainability in an Iowa agricultural watershed

  • Matthew T. Streeter
  • Keith E. Schilling
  • Calvin F. Wolter
Sediments, Sec 3 • Hillslope and River Basin Sediment Dynamics • Research Article

Abstract

Purpose

Soil erosion is an ongoing global agricultural crisis. Quantifying and tracking soil erosion and sediment export from agricultural watersheds is a key component for evaluating long-term sustainability.

Materials and methods

Our study used Revised Universal Soil Loss Equation soil erosion estimates and concentration of total suspended solids in-stream (determined through relationships with in-stream turbidity measurements) to estimate sediment delivery to an Eastern Iowa stream from a 780-ha watershed in 2015. Furthermore, we quantified soil organic carbon (SOC) and nitrogen (N) storage within the plow layer of our study area and used our estimated soil loss values to determine particulate nutrient export to the stream. These values were compared to in-stream nutrient sensor data in order to quantify the proportion of N in-stream coming from soil erosion compared to other sources.

Results and discussion

Results indicate that soil erosion in 2015 was approximately 7.5 Mg ha−1. Sediment export to the stream was determined to be 279 kg ha−1 and the sediment delivery ratio was estimated to be 3.7%. SOC and N stocks were 40 and 2.5 Mg ha−1, respectively. Approximately 0.01% of total SOC and N were lost from the plow layer in 2015.

Conclusions

This study identifies long-term risks to watershed sustainability and water quality associated with soil erosion which directs watershed managers towards Best Management Practices that may more effectively reduce export of soil and nutrients while increasing the sustainability of an essential agricultural industry.

Keywords

Erosion Nutrient export Sediment delivery ratio Turbidity 

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  • Matthew T. Streeter
    • 1
  • Keith E. Schilling
    • 1
  • Calvin F. Wolter
    • 2
  1. 1.Iowa Geological Survey, 300 Trowbridge HallUniversity of IowaIowa CityUSA
  2. 2.Iowa Department of Natural ResourcesDes MoinesUSA

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