Abstract:By comparing to the crop land (CL), the effects of two typical restoration measures (Zenia insignis Chun+Napiergrass (ZN) and Natural restoration (NR)) on soil hydraulic properties at three depths (surface layer 0—10 cm, subsurface layer 10—30 cm, underlying layer > 30 cm)were investigated in a typical peak-cluster depression area in northwestern Guangxi, based on in situ infiltration experiments and numerical inversion methods. The results showed that, the order for Ks was CL < ZN < NR. The two restoration measures had more obvious impacts on Ks both in the surface and underlying layer. Compared to the CL, the Ks increased by 49.0% (ZN) and 51.9% (NR) in the surface layer, and by 33.1% (ZN) and 21.1% (NR) in the underlying layer, respectively. The order for parameter α and n were CL < ZN < NR and CL > NR > ZN, and the rank for water-retaining property (calculated based on residual water content θr, saturated water content θs, α and n) was CL < NR < ZN. These results indicated that the two ecological restoration measures could improve soil hydrological functions. However, the statistical analysis showed that the differences among the soil hydraulic parameters in CL, NR and ZN were not significant (P> 0.05). There might be ascribed to the slow impacts of ecological restoration on soil hydraulic properties, and the high heterogeneity of soil hydraulic properties.