Summary
This study used in situ soil moisture networks and satellite remote sensing to characterise the transition from energy-limited to water-limited evapotranspiration during the 2018 Netherlands drought. By correlating soil moisture profiles with vegetation indices at different depths, the authors identified that water stress in vegetation lags soil moisture depletion by 2–3 weeks and that critical soil moisture thresholds vary with depth and location, reflecting root-water uptake dynamics. These parameterised relationships for non-stressed and water-stressed vegetation can improve drought impact modelling on carbon cycle processes.
UK applicability
The methodological approach of linking in situ soil moisture networks with satellite vegetation indices is directly applicable to UK drought monitoring and early warning systems, particularly given increasing summer drought frequency. The finding that vegetation stress lags soil moisture depletion could inform UK agricultural water management and drought forecasting protocols.
Key measures
Critical soil moisture content (%) at multiple soil profile depths; soil moisture anomalies; near-infrared reflectance of terrestrial vegetation (NIRv); vegetation optical depth (VOD); temporal lag between soil moisture deficit and vegetation stress
Outcomes reported
The study quantified critical soil moisture thresholds at different soil depths by comparing in situ soil moisture measurements with satellite-derived vegetation indices (NIRv and VOD) during the 2018 Dutch summer drought. The research identified a 2–3 week lag between negative soil moisture anomalies and detectable reductions in vegetation indices, and demonstrated that critical soil moisture content increases with soil depth as roots access deeper water reserves during progressive drought.
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