Abstract:
In order to clarify the differences of soil pH and nutrients and their spatial distribution under different vegetation types, we quantitatively analyzed the differences and spatial variation of pH, soil organic carbon (SOC), total phosphorus (TP), total nitrogen (TN) and ammonium nitrogen (AN) under different vegetation recovery types in the study area by combining the classical statistics and geostatistical methods. The results showed that all indicators (except for SOC) presented similar changes after different vegetation restorations. On the whole, the restoration effect decreased in the order of farmland > woodland > grassland > shrub. The variation coefficient of pH was 8.34%, which belonged to weak variation. And the nugget coefficient was 9.98%, which indicated a strong spatial correlation. The variation coefficients of SOC, TP, TN and AN were 86.44%, 31.92%, 87.76% and 58.58%, which belonged to moderate variation, respectively. And their nugget coefficients were 40.62%, 49.82%, 49.94% and 40.55%, showing medium spatial correlation, respectively. The best fitting model of AN was spherical model, and the best fitting model of the other indices was exponential model. In general, the distribution pattern of each index was gradually decreased from northeast to southwest of the study area.