68-5 Evaluation of Climate Change Adaptation Options for Agricultural Systems.
Poster Number 1207
The modified EPIC model was then used to evaluate the potential effects of climate change adaptations on crop yields, carbon respiration, soil carbon dynamics, and nitrate losses in runoff and leaching from representative farms in Alabama, Arkansas, Missouri, Mississippi, Florida, Kentucky, Louisiana, Texas, Georgia, and Tennessee. Adaptations included annual biochar applications, irrigation, and combined biochar and irrigation applications. Baseline (1979 – 2009) and future (2038 – 2068) scenarios were used for simulations with baseline and future CO2 concentrations of 360 ppmv and 500 ppmv, respectively. Climatic data for baseline scenarios used NOAA’s North American Regional Reanalysis (NARR) database. Climatic data for the future scenarios used the North American Regional Climate Change Assessment Program (NARCCAP) database. Four regional climate models were used for the future simulations to project different patterns of changes in air temperatures, precipitation, and solar radiation that are expected to occur over time. Climate had significant effects on all response variables for at least 2 of the 4 regional climate models. Biochar treatments did not display significant effects on yield that were different from the climate effects. Climate had a significant effect on nitrate leachate losses in comparison to the control for all the regional climate models. Although not significantly different from the other treatments, trends indicate that leachate nitrate losses were largest for the irrigation and climate treatments and lowest for the biochar treatment. Climate was significantly different from control for all four regional climate models. The trends in the data suggest that biochar was not effective in reducing nitrate loss in runoff. Soil organic carbon dynamics displayed significantly higher accumulations of carbon for the biochar and combined irrigation and biochar treatments for all models. Under some weather scenarios, EPIC simulation results suggest that irrigation and biochar applications may be considered as promising potential adaptation strategies for agriculture in the Southeastern United States.