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Measuring Fluxes of Mineral Nutrients and Toxicants in Plants with Radioactive Tracers

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Risk indicator for agricultural inputs of trace elements to Canadian soils.

S C Sheppard¹, C A Grant, M I Sheppard

¹ECOMatters Inc., 24 Aberdeen Ave., Pinawa, MB, Canada R0E 1L0. sheppards@ecomatters.com

Journal of Environmental Quality

|March 31, 2009

Summary

This summary is machine-generated.

Agricultural practices may increase soil trace element concentrations over time. A new model estimates that Canadian agricultural soils could see up to threefold increases in trace elements within 100 years, highlighting potential soil quality concerns.

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Area of Science:

Environmental Science
Agricultural Science
Soil Science

Background:

Trace elements (TEs) are naturally present in soils, but agricultural inputs like fertilizers and animal feed additives can alter their concentrations.
Concerns exist regarding the long-term impact of these added TEs on soil quality and potential toxicity.
Understanding future TE accumulation is crucial for developing sustainable agricultural management practices.

Purpose of the Study:

To develop and present a model estimating future trace element concentrations in Canadian agricultural soils.
To assess the potential risks associated with TE accumulation over time.
To provide an early warning system for soil quality deterioration due to TE buildup.

Main Methods:

A model was developed to estimate future TE concentrations across 2780 agricultural land polygons in Canada.
The model considers inputs from the atmosphere, fertilizers, manures, and municipal biosolids for elements including Arsenic (As), Cadmium (Cd), Copper (Cu), Lead (Pb), Selenium (Se), and Zinc (Zn).
Metrics were developed to quantify the risk related to TE accumulation.

Main Results:

Future soil concentrations of TEs are projected to increase, potentially up to threefold higher than current background levels within 100 years.
While steady-state toxic concentrations are far in the future, the projected increases indicate a significant impact on soil.
Geographic distribution of TE accumulation reflects agricultural intensity, with micronutrient fertilizer contributions being a key area of uncertainty.

Conclusions:

The study provides a valuable tool for predicting future TE concentrations in Canadian agricultural soils.
Projected increases in TE levels warrant attention for soil quality management and the development of best practices.
Further research on micronutrient fertilizer use is needed to refine future TE accumulation predictions.