Phosphorus Leaching from Soil Profiles in Agricultural and Forest Lands Measured by a Cascade Extraction Method
| Autor: | Sichen Tang, Zhengyi Hu, Xiaolei Sun, Zijian Xie, Songyan Li, Guoxi Wang, Lijuan Huang |
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| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
chemistry.chemical_element Soil science Forests 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences Soil Soil Pollutants Leachate Waste Management and Disposal Subsoil 0105 earth and related environmental sciences Water Science and Technology Topsoil Phosphorus Extraction (chemistry) Agriculture 04 agricultural and veterinary sciences Pollution chemistry Soil water Leaching (pedology) 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science |
| Zdroj: | Journal of Environmental Quality. 48:568-578 |
| ISSN: | 0047-2425 |
| DOI: | 10.2134/jeq2018.07.0285 |
| Popis: | The risk of P leaching from topsoil based on the change-point estimated via a split-line model between Olsen P and leachable P extracted by 0.01 M CaCl has been reported. However, little information is available for the assessment of P leaching from soil profiles. In this study, samples were collected at three depth profiles (0-20 cm, topsoil; 20-40 cm, subsoil; 40-60 cm, third-layer soil) at each of 74 sites under agriculture and forest in an agroforestry area. A cascade extraction method was proposed to determine the leachable P in the subsoil, extracted by the topsoil extraction solution; a similar extracted process was followed in the third-layer soil, and in the topsoil, it was still extracted by 0.01 M CaCl. A positive linear correlation was found between the subsoil leachable P extracted by the topsoil extraction solution and the accumulated P obtained from the subsoil leached by topsoil leachates, and so on. Therefore, the cascade extraction method for determining leachable P from topsoils and underlying soils could be valuable for predicting the potential of P leaching from soil profiles. Approximately 81, 73, and 73% of the agricultural sampling sites were at or above the change-points for the soil depths of 0 to 20, 20 to 40, and 40 to 60 cm (30.4, 32.9, and 18.2 mg kg respectively); these values were higher than those for the forest site, implying a high risk of P leaching from agricultural soil profiles in the study area. |
| Databáze: | OpenAIRE |
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