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A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging
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Combining Multiple High-Resolution In Situ Techniques to Understand Phosphorous Availability Around Rice Roots.

Wen Fang1, Paul N Williams2, Hao Zhang3

  • 1State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, China.

Environmental Science & Technology
|September 23, 2021
PubMed
Summary

Understanding phosphorus (P) behavior in flooded rice fields is difficult. New high-resolution imaging reveals P depletion around roots, driven by oxygen, iron, and phosphatase activity, crucial for sustainable P nutrition.

Keywords:
high-resolution visualizationin situ samplingiron labilityphosphatase activityphosphorus labilityrice rootsoil imaging systems

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Area of Science:

  • Soil Science
  • Biogeochemistry
  • Plant Nutrition

Background:

  • Understanding phosphorus (P) behavior in flooded rice systems is complex due to soil heterogeneity and analytical limitations.
  • High-spatial-resolution imaging is crucial for dissecting plant-soil interactions and chemical processes.
  • Existing methods struggle to capture the dynamic, micro-scale biogeochemical landscape around rice roots.

Purpose of the Study:

  • To integrate advanced imaging techniques for high-resolution, in situ chemical analysis of the rice rhizosphere.
  • To elucidate the interplay between oxygen, iron, phosphatase activity, and phosphorus dynamics throughout the rice life cycle.
  • To map P supply and demand at the micro-scale to understand P release mechanisms.

Main Methods:

  • Integration of diffusive gradients in thin-film (DGT) with laser ablation-ICPMS (LA-ICPMS) for high-resolution P mapping.
  • Simultaneous measurement of oxygen (O2) using planar optodes and phosphatase activity via soil zymography.
  • Application of these coupled techniques across the entire rice life cycle in flooded conditions.

Main Results:

  • High-resolution DGT revealed significant P depletion around both living and dead rice roots.
  • Spatially variable iron/phosphorus ratios indicated dynamic redox conditions and root influences.
  • Concurrent hotspots of P depletion and phosphatase activity were observed in the rhizosphere and detritusphere, confirming Porg mineralization.

Conclusions:

  • The study demonstrates the critical role of phosphatase activity in P release and organic P mineralization in rice rhizospheres.
  • Micro-scale biogeochemical mapping is essential for understanding P dynamics and improving sustainable P management in flooded rice.
  • Integrated imaging approaches provide unprecedented insights into complex plant-soil-microbe interactions.