Seasonal variations of phosphorus species in the Tuohe River, China. Part I. Sediments
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Sediment cores were collected at an upstream site (Jintang) and a downstream site (Neijiang) in summer and winter in the Tuohe River, which is one of the five largest tributaries of the Changjiang (Yangtze) River in China. A sequential leaching procedure was applied to determine the concentrations of the different forms of solid phosphorus, including exchangeable phosphorus (Exc-P) as well as phosphorus associated with iron oxides (Fe-P), with aluminum oxides (Al-P), with apatite (Ca-P) and with the residual fraction (Res-P), as correlated with water content and total organic carbon. The seasonal variations and the vertical distributions of phosphorus species in sediments at both sampling sites demonstrated that: 1) total phosphorus (TP) in summer and winter were ranged between 1 313–2 330, 1 491–2 228 mg/kg in Jintang and 543–2 128, 603–1 175 mg/kg in Neijiang, respectively. It can predicated the pollution of TP in Jintang is serious than that in Neijiang both in summer and winter; 2) total inorganic phosphorus (TIP) was the dominant form of TP; 3) Ca-P was the main chemical forms of TIP in the sediments. Based on the profiles in sediments and bio-available phosphorus data, it revealed that bio-available phosphorus (BAP) represented only a minor portion (0.61%–3.59%) of TP, and the vertical distribution of soluble reactive phosphorus (SRP) in corresponding porewaters was more abundant in the upper layer of the sediment, which suggests that BAP may be converted to non-bioavailable phosphorus in deeper layer of the sediment of this dynamic system.
Keywordphosphorus species vertical distribution seasonal variation Tuohe River
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Thanks to Dr. WU Y., Ms. WANG S. and Ms. ZHANG R. at Chengdu University of Technology for their active assistance in this work.
- Huang Q H, Wang D H, Wang C X, Ma M, Wang Z J. 2004. Vertical variation of the phosphorus form in the sediments of Meiliang Bay and Wuli lake of Taihu lake. China Environmental Science, 24 (2): 147–150. (in Chinese with English abstract)Google Scholar
- Li J, Liu C Q, Wang S L, Zhu Z Z, Zhou Z H, Xiao H Y. 2004. Distribution characteristics of different forms of phosphorus in surficial sediments from Wuli, Taihu Lake, China. Acta Mineralogica Sinica, 24 (4): 405–410. (in Chinese with English abstract)Google Scholar
- Liu L Y, Gao X J, Chen Z M, Song Z G. 2005. Distribution and forms of phosphorus in intertidal sediments of the Yangtze Estuary. Journal of Fudan University ( Natural Science ), 44 (6): 1 033–1 036. (in Chinese with English abstract)Google Scholar
- Pang Y. 2004. Studies on the Phosphorus Forms and Character of Phosphorus Adsorption in the Sediment of Five Big Lakes. Chinese Research Academy of Environmental Sciences, Beijing, China, 52p. (in Chinese with English abstract)Google Scholar
- Xu Q, Guo Y F, Deng T L, Cheng Y W, Belzile N. Seasonal variations of phosphorus species in the Tuo River, China. Part II. Overlying and porewaters. Chinese Journal of Oceanology and Limnology (under review).Google Scholar
- Zhu G W, Qin B Q. 2003. Chemical sequential extraction of phosphorus in lake sediments. Journal of Agro–Environment Science, 22 (3): 349–352. (in Chinese with English abstract)Google Scholar