Abstract
Elevated tropospheric ozone (O 3 ) concentrations can negatively impact wheat growth by reducing photosynthesis and accelerating leaf senescence. Future global O 3 concentrations are expected to increase in many regions, which will further limit global wheat production. However, few crop models consider the effects of O 3 stress on wheat. We incorporated the effects of O 3 stress on photosynthesis and leaf senescence into the DSSAT-NWheat crop model and reproduced an observed experiment and reported yield declines from the literature. Simulated wheat yields decreased as daily O 3 concentrations increased above 25 ppb, with yield losses ranging from 0.26% to 0.95% per ppb O 3 increase, depending on the cultivar O 3 sensitivity. The model reproduced known wheat physiological responses from the combination of O 3 stress with water deficit and elevated atmospheric CO 2 concentration. Increased water deficit stress and elevated atmospheric CO 2 both reduce the negative impact of O 3 , but yield benefits from elevated CO 2 can be lost due to elevated O 3 concentrations. The O 3 -modified NWheat model simulates the effects of O 3 stress on wheat growth and yield in interaction with other growth factors and can be used for studies on climate change and O 3 impacts.
| Original language | English |
|---|---|
| Pages (from-to) | 13-23 |
| Number of pages | 11 |
| Journal | European Journal of Agronomy |
| Volume | 105 |
| DOIs | |
| State | Published - Apr 2019 |
| Externally published | Yes |
Keywords
- Crop model
- Elevated CO
- Food security
- Ozone
- Water stress
- Wheat yield
