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Arbuscular mycorrhizas reduce nitrogen loss via leaching
Hamid R Asghari1, Timothy R Cavagnaro
1Faculty of Agriculture, Shahrood University of Technology, Shahrood, Iran.
Plos One
|January 19, 2012
Summary
Mycorrhizal fungi significantly reduce nitrate leaching from soils, with mycorrhizal tomato roots decreasing losses by nearly 40 times compared to non-mycorrhizal roots. This highlights their crucial role in preventing nutrient loss.
Area of Science:
- Soil Science
- Plant Pathology
- Ecology
Background:
- Nitrate (NO₃⁻) and ammonium (NH₄⁺) loss via soil leaching is an environmental concern.
- Arbuscular mycorrhizal (AM) fungi can influence soil nitrogen dynamics, but their role in reducing nutrient leaching is less understood.
- Previous studies often use indirect methods to assess AM's impact on soil nitrogen.
Purpose of the Study:
- To investigate the direct capacity of mycorrhizal versus non-mycorrhizal root systems in reducing soil nitrate and ammonium leaching.
- To utilize a mycorrhiza-defective tomato mutant and its wildtype progenitor to isolate the effects of AM colonization.
Main Methods:
- A microcosm-based study was employed.
- Compared nitrate and ammonium leaching in soil systems with mycorrhizal and non-mycorrhizal tomato root systems.
- Applied a pulse of ammonium nitrate to experimental microcosms to simulate nutrient loading.
Main Results:
- Mycorrhizal root systems dramatically reduced nitrate leaching by approximately 40 times compared to non-mycorrhizal roots.
- Ammonium leaching differences were also observed, though nitrate reduction was the most significant finding.
- The use of a specific plant-host system minimized confounding effects on soil nitrogen cycling and biota.
Conclusions:
- Arbuscular mycorrhizal (AM) fungi possess a significant capacity to reduce nitrate loss from soils via leaching.
- The benefits of AM extend beyond plant nutrition, playing a vital role in soil nutrient retention.
- These findings underscore the importance of considering AM fungi in strategies for sustainable soil and water management.
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