Welcome to Chinese Journal of Applied Ecology! Today is

Chinese Journal of Applied Ecology

Previous Articles     Next Articles

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.