Forums | HES 健康与环境科学

30 April 2024, 11:09 AM

Speaker: Sha Zhang

Date: 2024-05-02

Time: 13:00-13:30 

Room: ES354

Online link:

https://meeting.tencent.com/dm/v169BGHYrPM6

Meeting ID: 668-4466-7997

Title: Semi-Perennial Rice can Compensate for Losses in Rice Production under Heatwaves

Abstract:

Recent heatwaves can cause abrupt productivity changes of crop system, but little is known about the resilience of food crop system. Semi-perennial rice has shown the ratooning potential to adapt such extreme conditions. Here, in our two-year study manipulating natural heatwaves, we found that heatwaves promoted the ratooning adaptability in rice. This resulted in tradeoffs between heat-induced losses and ratoon-yielded gains in cooler seasons. Despite substantial crop failure (69% - 100%) under heatwaves, the subsequent ratoon yields offer up to 100% compensation, and produces healthier food with ~50% lower arsenic burdens. Quality changes induced by heatwaves and adaptive ratooning, are causally linked to rice productivity, soil contamination levels and temperatures in nonlinear manners. We further gathered a unique paired main-ratoon yield dataset (n=11300) worldwide and estimated that widespread ratoon practice can increase yields by 6.5× 107 Mg per year and reduce the exposure inorganic arsenic by 4.9 (± 1 standard deviation, 0.7) × 102 Mg inorganic arsenic per year in China. Together, these findings underscore the overlooked adaption potential of semi-perennial rice to climate extremes.