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Characteristics of phosphorus adsorption and desorption of soils from wetlands recovered from farmlands in Caizi Lake.

YANG Yan-fang1, KONG Ling-zhu2, ZHENG Zhen2, LIU Shuang2, LIU Wen-jing2, ZHANG Ping-jiu2   

  1. (1College of Environmental Science and Engineering, Anhui Normal University, Wuhu 241003, Anhui, China; 2Anhui Key Laboratory of Natural Disasters Process and Prevention/College of Territorial Resource and Tourism, Anhui Normal University, Wuhu 241003, Anhui, China)
  • Online:2014-04-18 Published:2014-04-18

Abstract: In this study, topsoil samples were collected from wetlands recovered from farmlands respectively for 3, 5, 9 and 11 years around Caizi Lake, Anhui, China. Their characteristics of adsorption and desorption of phosphorus were examined with comparison to soils sampled from an adjacent vegetable farmland and a noncultivated wetland. Phosphorus adsorption curves of all studied soils could be modeled by Langmuir and Freundlich equations (P<0.01). The maximum P adsorption (Xm), adsorption constant K and  maximum buffer capacity (MBC) of all the 6 soil samples were in the ranges of 478-1074 mg·kg-1, 0.14-0.61 and 68.6-661.5 mg·kg-1, respectively. These three parameters all tented to increase with the recovered years but did not reach the values of the noncultivated wetland. However, the P desorption rate ranging from 6.2% to 14.6%, increased first and then decreased with the recovered years and was significantly higher than that of the non-cultivated wetland. It was concluded that the P immobilization would increase with the recovery years of cultivated wetlands, which could be affected by the soil organic carbon and clay contents of the wetland soil.