Soil samples were collected along soil profiles in the unrestored and restored wetlands of the Yellow River Delta, China in order to investigate the changes of soil properties along soil profiles after the implement of wetland restoration project in this region in 2005. Results showed that soil pH showed a significant increase (p < 0.001) from surface (0-10 cm) to subsurface soils (10-20 cm), while electric conductivity, total nitrogen, soil organic matter and total sulfur dropped sharply from surface to subsurface soils, and then they all kept stable at deeper soil layers in both types of wetlands. Soil pH and electric conductivity decreased after the restoration, while lower soil nutrients (eg. SOM, TN, TS) in top soil were also observed in restored wetland than those in unrestored wetland, except that total concentration of phosphorous and potassium. Total P and K were elevated in restored wetland along soil profiles. Correlation analysis showed that soil pH was significantly correlated with TS and TK in upper soils of the unrestored wetlands, while EC was significantly correlated with TS and TK in the restored wetlands. However, in deeper soil no significant correlations were observed between soil pH or EC with soil nutrients in both wetlands. © 2010 Published by Elsevier Ltd.
Gao, H., Bai, J., Wang, Q., Huang, L., & Xiao, R. (2010). Profile distribution of soil nutrients in unrestored and restored wetlands of the Yellow River Delta, China. In Procedia Environmental Sciences (Vol. 2, pp. 1652–1661). https://doi.org/10.1016/j.proenv.2010.10.176