Modelling Soil Water Retention for Weed Seed Germination Sensitivity to Water Potential
Figure 4
Fitted SWRC for soil water contents at soil matric potentials for the (a) summit, (b) backslope, and (c) toeslope positions using the Campbell (CA) model with absent parameter, and Brooks-Corey (BC), five- and four-parameter van Genuchten (VG5 and VG4), Tani (TA), and Russo (RU) models with modified as one of the fitted parameters. Hillslopes are averaged. Error bars are SE for six water retention measurements. Model* represents SWRC models that have significantly different water retention within a water potential interval compared to the BC model. Water potential intervals A: −0.01 to −0.1 MPa; B: −0.1 to −0.5 MPa; C: −0.5 to −1.0 MPa; D: −1.0 to −1.5 MPa represent groups of minimum threshold water potential sensitivity for germination.
