Sediment phosphorus release in response to flood event across different land covers in a restored wetland
- 100 Downloads
The phosphorus (P) fraction and its release characteristics from sediment in response to flood events across different land covers (i.e., reclaimed land with dominant vegetation of Phragmites australis and/or Typha orientalis, grassland with dominant vegetation of annual and perennial forbs, and bare land) in the lakeshore of Chaohu Lake were investigated. The results indicated that the re-flooding of a restored wetland led to P release. IP (inorganic P) was the major P fraction in the soils pre-flood and post-flood. For all the soil samples, the rank order of P fractions was Ca-P (P associated with calcium) > OP (organic P) > Fe/Al-P (P bound to Al, Fe, and Mn oxides and hydroxides). During flooding, Fe/Al-P contributed the most as the P release source in the soils and to the P sources for the overlying water. In reclaimed land, Fe/Al-P release correlated significantly with soil pH. In grassland, Fe/Al-P release correlated significantly with soil pH and Al content. In bare land, Fe/Al-P release correlated significantly with Al and clay content. The max TP release rates were also significantly influenced by land cover, and the values in bare land, grassland, and reclaimed land were 9.91 mg P m−2 day−1, 8.10 mg P m−2 day−1, and 5.05 mg P m−2 day−1, respectively. The results showed that the P release processes might be regulated by different factors across different land covers, and that the re-introduction of vegetation during wetland restoration must be taken into account prior to flood events to avoid an undesirable degradation of water quality.
KeywordsSubmergence Restored wetland Soil phosphorus release Land cover Freshwater lakes
We thank Guowen Li for data collection. This study was supported by the National Key Research and Development Program of China (2016YFD0200309-4).
- Bao SD (2000) Soil and agricultural chemistry analysis. Chinese Agricultural Press, BeijingGoogle Scholar
- Gao J, Zhang Z, Huang Q, Cai Y (2017) Aquatic eco-function regions of Chaohu basin. Science Press, BeijingGoogle Scholar
- Rowell DL (1994) Soil science: methods & applications. Longman, HarlowGoogle Scholar
- Sharpley AN (2003) Development of phosphorus indices for nutrient management planning strategies in the United States. J Soil Water Conserv 58:137–151Google Scholar
- Shi Y, Zhou Q (2006) The ecological problem of wetlands in China and protection strategies. Chin Agric Sci Bull 22:337–340 (in Chinese)Google Scholar
- Siciliano SD, Chen T, Phillips C, Hamilton J, Hilger D, Chartrand B, Grosskleg J, Bradshaw K, Carlson T, Peak D (2016) Total phosphate influences the rate of hydrocarbon degradation but phosphate mineralogy shapes microbial community composition in cold-region calcareous soils. Environ Sci Technol 50:5197–5206CrossRefGoogle Scholar
- Simpson ZP, McDowell RW, Condron LM (2018) The error in stream sediment phosphorus fractionation and sorption properties effected by drying pretreatments. J Soils Sediments. https://doi.org/10.1007/s11368-018-2180-3
- Xu DX, Qin YW, Zhang L, Zheng BH, Hai RT (2009) Phosphorus forms and its distribution characteristics in sediments and soils of water-level-fluctuating zone of the backwater reach from input river of Three Gorges Reservoir. Environ Sci 30:1337–1344 (in Chinese)Google Scholar
- Ying W, Shen Z, Lijuan HU (2008) Adsorption and release of phosphorus from sediments from the main branches of the Three-Gorges Reservoir. Acta Sci Circumst 28:1654–1661 (in Chinese)Google Scholar