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In Situ Soil Moisture Sensors in Undisturbed Soils
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Quantifying soil moisture impacts on light use efficiency across biomes.

Benjamin D Stocker1,2, Jakob Zscheischler1, Trevor F Keenan3,4

  • 1Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, 8092, Switzerland.

The New Phytologist
|April 1, 2018
PubMed
Summary
This summary is machine-generated.

Soil moisture significantly impacts terrestrial primary productivity and the carbon cycle, reducing gross primary productivity (GPP) by up to 40%. Accounting for soil moisture is crucial for accurate drought assessments.

Keywords:
drought impactseddy covariancegross primary productivity (GPP)light use efficiencyphotosynthesissoil moisturestandardized precipitation indexvapour pressure deficit (VPD)

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Area of Science:

  • Ecology
  • Earth System Science
  • Remote Sensing

Background:

  • Terrestrial primary productivity and carbon cycling are often assessed using vapor pressure deficit (VPD) and greenness, neglecting soil moisture's role.
  • Soil moisture is a critical factor influencing plant physiology and productivity.

Purpose of the Study:

  • To investigate the impact of soil moisture on light use efficiency (LUE) and gross primary productivity (GPP).
  • To quantify the fractional reduction in LUE due to soil moisture (fLUE), independent of VPD and greenness changes.

Main Methods:

  • Utilized artificial neural networks trained on eddy covariance data, soil moisture datasets, and remotely sensed greenness.
  • Developed a method to isolate the effect of soil moisture on LUE (fLUE).

Main Results:

  • Soil moisture alone can reduce GPP by up to 40% in arid and semi-arid regions.
  • Found a muted fLUE response to drying in moist climates but reduced fLUE under wet conditions.
  • Drought-deciduous vegetation, including grasslands, showed the largest fLUE reductions.

Conclusions:

  • Soil moisture limitation significantly impacts terrestrial productivity and carbon cycle assessments.
  • Current methods relying solely on VPD and greenness overlook substantial drought impacts.
  • Incorporating soil moisture data is essential for accurate terrestrial productivity data products and drought monitoring.