Remote Sensing of CO₂ Absorption by Saline-Alkali Soils: Potentials and Constraints

Figure 3

Estimation of soil CO₂ fluxes (soil respiration fluxes: 𝐹_𝑐) along a field gradient of the air temperature 10 cm above the soil surface (𝑇) with 𝐹_𝑐=2.58∗1.17^{(𝑇−10)/10}−2.86 (a: 𝑅²=0.86, RMSE = 0.23) and analysis of the contributions of dew amounts in 𝐹_𝑥 with 𝐹_𝑥=−0.82∗𝑒^10∗dew + 0.18 (b: 𝑅²=0.1008, RMSE=0.4219) and  𝐹_𝑥=4.07∗𝑒^−10∗dew − 6.38 (c: 𝑅²=0.53, RMSE = 0.75), where 𝐹_𝑥 is defined as the unexplained part of 𝐹_𝑐 by the 𝑄₁₀ model (from [12]).