Taking the secondary broad-leaved forest

Cunninghamia lanceolata forest and Phyllostachys heterocycla forest in the flood disaster disturbed area as the research objects

the change characteristics and main influencing factors of 11 soil physical properties

including soil bulk density

porosity

field capacity and so on

in the process of natural restoration were analyzed. The results showed that: (1) During the process of undestroyed-destroyed-natural recovery

soil bulk density of secondary broad-leaved forest and C. lanceolata forest increased first and then decreased

while that of P. heterocycla forest decreased gradually. The total porosity

moisture content

saturated water-holding capacity

capillary water-holding capacity and field water-holding capacity of secondary broad-leaved forest and C. lanceolata forest decreased first and then increased

while those of the P. heterocycla forest gradually decreased. The soil texture of three forest types became coarse and then fine. (2) According to the results of correlation analysis and principal component analysis

moisture content

capillary water-holding capacity and field water-holding capacity could be used as the main indicators to evaluate the recovery capability of soil physical properties in the damaged area. (3) According to the results of principal component analysis and factor analysis

soil erosion resistance of three forest types decreased first and then increased in the process of undestroyed-destroyed-natural recovery

and the soil erosion resistance at the stage of natural recovery followed the order of C. lanceolata forest > secondary broad-leaved forest > P. heterocycla forest. This study provided a theoretical basis for the study of the change rules of soil physical properties and soil recovery mechanisms in the disaster disturbed area.