Estimation of crop production and CO2 fluxes using remote sensing: Application to a winter wheat /sunflower rotation.
Gaétan Pique, Taeken Wijmert, Rémy Fieuzal, Eric Ceschia (2020)
ECAS 2020 meeting. Environ. Sci. Proc. 2021, 4(1), 15;
https://doi.org/10.3390/ecas2020-08141
Abstract
To meet the incoming growth of the world’s food needs, and the demands of climate change, the agricultural sector will be forced to adapt its practices. To do so, the contribution of agricultural fields to greenhouse gas emissions, as well as the impact—on soil, climate and productions—of certain agricultural practices have to be known.
In this study, the SAFY-CO2 crop model is driven by remote sensing products in order to estimate CO2 fluxes on the main crop rotation observed in the study area, i.e., winter wheat followed by sunflower. Different modeling scenarios are tested, particularly for intercropping periods, the approach being validated locally, thanks to eddy covariance flux measurements, and then applied regionally.
brown, and green respectively.
Results showed that the model was able to reproduce crop production with high accuracy (rRMSE of 21% and 24% for winter wheat and sunflower yield, respectively) as well as daily net CO2 flux (RMSE of 1.29 and 0.97 gC.m−2.d−1 for winter wheat and sunflower respectively).
Moreover, the tested modeling scenarios highlight the importance of taking the regrowth events into account for assessing accurate carbon budgets. In a perspective of large-scale application, the model was upscaled over more than 100 plots, allowing discussion of the effect of regrowth on carbon uptake.
without taking regrowth events into account (A), and the differences in the scenario where regrowth events are considered (B).
