喀斯特农田-湿地系统中土壤和沉积物中 P 和 Ca 分布和分馏的时空变化。
Spatial and temporal changes of P and Ca distribution and fractionation in soil and sediment in a karst farmland-wetland system.
机构信息
Research Center for Soil Contamination and Environment Remediation, Southwest Forestry University, Kunming, Yunnan, 650224, China; Soil and Water Sciences Department, University of Florida, Gainesville, FL, 32611, USA.
Research Center for Soil Contamination and Environment Remediation, Southwest Forestry University, Kunming, Yunnan, 650224, China.
出版信息
Chemosphere. 2019 Apr;220:644-650. doi: 10.1016/j.chemosphere.2018.12.183. Epub 2018 Dec 27.
Phosphorus (P) is a critical element affecting eutrophication in aquatic ecosystems. Its availability is closely related to calcium (Ca) in calcareous soils and sediments, but their relations are unclear. In this study, the spatial and temporal changes in P and Ca fractionation and distribution in a karst farmland-wetland ecosystem were investigated. The results showed that total P concentrations were 1.25-3.19 g kg, with higher concentrations in paddy soil than in sediment. Total Ca concentrations were 3.93-10.2 g kg, with higher Ca being accumulated in sediments than in soils. The P fractionations varied seasonally, with Ca-bound P being dominant. The moderately-stable Fe/Al-bound P showed temporal variation, while Ca was dominant in acid-soluble fraction, both probably playing an important role in controlling P availability. Correlation analysis showed seasonal relation between Ca and P distribution in soil/sediment. This study suggests that P migration from farmland to wetland may be a major source for P accumulation in sediments in a karst farmland-wetland system.
磷（P）是影响水生生态系统富营养化的关键元素。其可利用性与钙质土壤和沉积物中的钙（Ca）密切相关，但它们之间的关系尚不清楚。本研究调查了喀斯特农田-湿地生态系统中磷和钙形态和分布的时空变化。结果表明，总磷浓度为 1.25-3.19g/kg，稻田土壤中的浓度高于沉积物。总钙浓度为 3.93-10.2g/kg，沉积物中积累的钙多于土壤。磷形态的季节性变化较大，其中钙结合磷占主导地位。中等稳定的铁/铝结合磷表现出时间变化，而酸溶性磷中钙占主导地位，这两者可能在控制磷的可利用性方面发挥重要作用。相关分析表明，土壤/沉积物中钙和磷的分布具有季节性关系。本研究表明，农田向湿地的磷迁移可能是喀斯特农田-湿地系统中磷在沉积物中积累的主要来源。
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