title: Characterization of phosphorus in the sedimentary environments of inundated agricultural soils around the Huainan Coal Mines, Anhui, China.
abstract: Extensive coal mining in the Huainan Coal Mines, Anhui China, in light of the local hydrology and geology, has resulted in extensive land subsidence and submergence around the mines. This has led to the formation of large (>100 km(2)) lakes. Three representative lakes were selected to study the mechanisms of phosphorus (P) unavailability for primary production from the perspective of sedimentary environments, which in turn owe their formation to permanently inundated agricultural soils. Two important issues were considered: (1) potential of P transport from the cultivated soil column toward surface sediments and (2) characterization of P behavior in view of regional ecological rehabilitation and conservation. Accordingly, we conducted field sediment analyses, combined with simulation experiments of soil column inundation/submergence lasting for four months. Enrichment of Fe-(hydr)oxides in surface sediments was verified to be the main reason for limitations in regional P availability in water bodies. Iron (Fe), but not its bound P, moved upward from the submerged soil column to the surface. However, an increasing upward gradient in the contents of organic matter (OM), total nitrogen (N), total phosphorus (TP), and different P fractions was caused by spatial heterogeneity in soil properties. Phosphorus was unable to migrate upward toward the surface sediments as envisioned, because of complex secondary reactions within soil minerals. Phosphorus bound to Fe and/or Al comprised over 50% of TP, which has important implications for local ecological rehabilitation and water conservation.
authors: School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China. Electronic address: yiqitao@163.com.
authors: Qitao
authors: Q
authors: Yi
authors: School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China.
authors: Kai
authors: K
authors: Xie
authors: School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China.
authors: Pengfei
authors: P
authors: Sun
authors: Department of Environmental Engineering, Hanseo University, Seosan 356706, Republic of Korea.
authors: Youngchul
authors: Y
authors: Kim
mesh_terms: D000383:Agriculture; D002681:China; D003032:Coal Mining; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D060106:Lakes / Q000737:chemistry; D010758:Phosphorus / Q000032:analysis*; D012987:Soil; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D012987:Soil; D014874:Water Pollutants, Chemical; D010758:Phosphorus
keywords: Agricultural soils; Eutrophication; Inundation; Iron; Phosphorus