RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2025, Vol. 34 >> Issue (07): 1470-.doi: 10.11870/cjlyzyyhj202507002

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Evolution of Soil Cation Exchange Property and Influencing Factors in the Lower Yangtze River Alluvial Plain

JI Jiachen, XU Mingxu， SU Baowei， ZHANG Yalu， JIAO He， LI Shengfeng， GAO Chao   

  1. Cation exchange capacity is an important indicator of soil quality. Revealing the regional spatial differentiation and dynamic change characteristics of soil cation exchange capacity can provide a scientific basis for the rational utilization of soil resources. In this paper, the polder areas of the alluvial plain along the lower Yangtze River were selected. By constructing a soil time series of 3000 years, the evolution characteristics of soil cation exchange property were analyzed. With the increase of cultivation time, the pH of the flood plain soil decreased rapidly, and the soil organic carbon content (SOC) generally increased gradually. Exchangeable Ca2+, Mg2+, total exchangeable bases (TEB) and base saturation (BS) decreased by 497%, 607%, 425% and 699% respectively, while K+ increased by 297%. The cation exchange capacity (CEC) increased continuously in the early stage, yet it showed a downward trend afterward. Compared with the polder area that had been reclaimed for 2000 years, the CEC of the dry land and paddy field that had been reclaimed for 3000 years decreased by 252% and 234% respectively. The main factors affecting the soil cation exchange capacity were soil texture and SOC content. The influence of land use patterns was reflected in the re-base process during rice cultivation, which increased BS. A relatively satisfactory result could be obtained by predicting the CEC using factors such as SOC, texture, reclamation history and land use. Our results based on soil chronosequence observation indicated that sufficient attention should be paid to the problem of the decline in cation exchange capacity and other soil quality indicators after long-term utilization in the alluvial plain areas along the Yangtze River.
  • Online:2025-07-20 Published:2025-07-23

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