JOURNAL OF NATURAL RESOURCES ›› 2019, Vol. 34 ›› Issue (12): 2580-2587.doi: 10.31497/zrzyxb.20191208

• Special Forum of "Wetland" • Previous Articles     Next Articles

Adsorption kinetics of phosphorus on typical wetland soils with Phragmites australis in the Yellow River Estuary

BAI Jun-hong(), YE Xiao-fei, HU Xing-yun, WANG Wei, ZHANG Ling   

  1. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
  • Received:2019-03-11 Revised:2019-06-18 Online:2019-12-28 Published:2019-12-28

Abstract:

Phragmites auatralis wetlands affected by different flooding conditions (TW: tidal flooding wetlands; FW: fresh water restoration wetland; SW: seasonal flooding wetlands) were selected in the Yellow River Estuary to analyze the adsorption kinetics characteristics and influencing factors of phosphorus on surface wetland soils. Our results suggested that the adsorption of phosphorus in the overlying water on reed wetland soils with different water and salt conditions showed an order of FW>TW>SW, which indicated that the phosphorus adsorption capacity of FW soils was the largest. The phosphorus adsorption of soils from these three types of wetlands exhibited the fastest initial stage (0-3 h), and then gradual slowing (3-24 h), after that a slow and balanced state (after 24 h). However, the FW soils had the fastest absorption rate to phosphorus, while the SW soils showed the slowest absorption rate. The difference in water and salt conditions and physicochemical properties of wetland soils (such as pH, salinity, soil texture, Al0, Fe0 and Ca0) were the main factors leading to differences in phosphorus adsorption amount and rate among the three types of wetland soils. The Simple Elovich model and the Power Function model were more suitable to simulate the dynamic characteristics of phosphorus adsorption by Phragmites auatralis wetland soils in the Yellow River Estuary. The freshwater restoration project of degraded wetlands in the Yellow River Estuary can promote the adsorption of phosphorus on wetland soils to a certain extent, and thus reduce the eutrophic risk of the overlaying water of coastal wetlands.

Key words: phosphorus, sorption kinetics, wetland soils, Phragmites australis, Yellow River Estuary