Navigating water stability and crop resilience in a changing climate: insights from SPEI, CWSI, and CMIP6 projections.
Zulfiqar H, Rahman M, Lee HK, Kim HJ
Climate Adaptation
Rice paddies and vegetable farms in monsoon-dependent regions like Korea — and eventually other seasonal-rain climates worldwide — face expanding dry spells that will stress crops precisely when they need water most, a pattern that will ripple into food prices and availability everywhere.
Scientists built a toolkit that tracks how dry it gets, how thirsty crops become, and how well water systems bounce back — then ran it forward in time using climate models. They found that areas where plants can reliably get enough water are shrinking, replaced by zones where seasonal droughts hit harder and harvests become less predictable. The problem grows worse under higher greenhouse-gas emissions, but even the lower-emissions path still means more stressed crops.
Key Findings
Both moderate (SSP2-4.5) and high-emissions (SSP5-8.5) scenarios project expansion of high-risk crop water zones in South Korea, with differences between them modest in the near term but diverging later in the century.
Precipitation variability and evaporative demand are both increasing, intensifying seasonal water stress especially in summer and autumn — the critical growing season for staple crops.
Spatial analysis shows a clear regional shift from stable/resilient water conditions to critical/high-risk conditions, revealing emerging agricultural vulnerabilities that a single-index approach would have missed.
chevron_right Technical Summary
Researchers developed a combined framework to measure drought stress and crop water vulnerability in South Korea, then used it to project how climate change will expand high-risk agricultural zones through the end of the century. Both moderate and high-emissions scenarios show worsening summer and autumn water stress, with the gap between them widening only in the long term.
Abstract Preview
Monsoon-dominated agricultural regions face increasing hydro-climatic stress driven by climate change, yet a critical methodological gap persists: no integrated, spatially explicit framework simult...
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