Fig 1.
Changes in water level in the Guanyinyan Reservoir area in 2022.
Table 1.
Basic information of sample sites at different elevations in the subsidence zone of Reservoir.
Table 2.
Root morphological indicators at sampling points with different elevations in the reservoir subsidence area.
Table 3.
Commonly used soil erosion resistance evaluation indicators.
Table 4.
KMO test and Bartlett’s test of sphericity.
Table 5.
Total variance analysis of soil erosion resistance indexes in different elevation extinction zones in Guanyinyan Reservoir area.
Fig 2.
Gravel chart of the soil at different water level elevations.
Table 6.
Score factor and weights of different soil erodibility indicators.
Table 7.
The critical values for different indicators in the ‘S’ and reverse ‘S’ membership functions.
Fig 3.
Changes in soil physicochemical properties at different water level elevations.
R: Root soil, UR: Un-rooted soil *indicates that there are significant differences (p < 0.05) in the root soil and un-rooted soils at the same elevation.
Fig 4.
The proportion of each particle size of water-stable aggregates at different water levels and elevations UR: Un-rooted zone soil, R: root zone soil.
L-Low, M-Mid, H-High.
Fig 5.
MWD and GMD values of soil water-stable aggregates in different elevation subsidence zones.
Different uppercase and lowercase letters indicate that there are significant differences at the 0.05 level in different elevations.
Fig 6.
Erodibility factor (K value) of different elevations in the subsidence zone of Guanyinyan Reservoir area.
Different lowercase letters indicate that there are significant differences at the 0.05 level in different elevations.
Fig 7.
Shear Strength(S) of different elevations in the subsidence zone of Guanyinyan Reservoir area.
Different lowercase letters indicate that there are significant differences at the 0.05 level in different elevations.
Fig 8.
Variation of CSEI with water level elevation.
Table 8.
Correlations of soil properties across elevation zones.
Fig 9.
Redundancy analysis (RDA) of the relationship between soil physicochemical properties and soil erodibility factor K and shear strength in the riparian zone.
BD: Bulk density; TP: total porosity; OM: organic matter;K: soil erodibility factor;S: shear strength;WSA0.25: water-stable aggregates larger than 0.25 mm; DSA0.25: dry-sieved aggregates larger than 0.25 mm; PAD: percentage of aggregate destruction for aggregates larger than 0.25 mm; MWD: mean weight diameter; GMD: geometric mean diameter.
Fig 10.
Relationship between CSEI and TP, Sand, Silt, Clay, OM, MWD, GMD, WSA0.25, DSA0.25, PAD, and K.