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| Effects of Land Use Types on Phosphorus Forms and Their Contents in Soil Aggregates in Watershed of Hongfeng Lake |
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| KeyWord:Hongfeng Lake watershed; land use; aggregate; phosphorus content; phosphorus form |
| Author Name | Affiliation | | YANG Hua | Guizhou Key Laboratory of Mountain Environment, Guizhou Normal University, Guiyang 550001 | | LONG Jian | Guizhou Key Laboratory of Mountain Environment, Guizhou Normal University, Guiyang 550001 | | LI Zhao-jun | Institute of Agricultural Resources and Regional Planning, China Academy of Agricultural Sciences, Beijing 100081 | | LIAO Hong-kai | Guizhou Key Laboratory of Mountain Environment, Guizhou Normal University, Guiyang 550001 | | LIU Ling-fei | Guizhou Key Laboratory of Mountain Environment, Guizhou Normal University, Guiyang 550001 | | LI Juan | Department of Geography and Environment Science, Guizhou Normal University, Guiyang 550001 |
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| Abstract: |
| Excessive phosphorus（P） in soils may increase the potential to pollute water through runoff and/or leaching. Different land use types may change phosphorus mobility. A study was performed to examine the chemical forms and their contents of P in bulk soil and soil aggregates at 0～15 cm and 15～30 cm under four land use types：cornfields, vegetable fields, forest land and abandoned land in the watershed of Hongfeng Lake in Anshun, Guizhou Province. Total P contents in bulk soils and soil aggregates were in order of cornfields>vegetable fields>abandoned land>forest land under different land use types. Residual P, NaOH-P, and NaHCO3-P were the major forms in soil aggregates at each depth. The residual P was the highest among all P forms in soils under four land use types, and ranged 28.3%～45.4%, 61.1%～72.7%, 45.9%～53.0% and 52.1%～72.4% in cornfield, forest land, vegetable field and abandoned land, respectively. The organic P contents were as about 2 times as inorganic P contents in cornfield and vegetable field. Soil P was mainly present in soil aggregates of 5～2 mm and 2～0.5 mm, accounting for more than 77% of soil total P. Phosphorus in aggregates of 5～2 mm and 2～0.5 mm in cultivated soils including cornfield and vegetable field were the main contributors to lake P and could be the key factor of the lake eutrophication. |
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