Impact of Suspended Inorganic Particles on Phosphorus Cycling in the Yellow River (China)

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• 作者：Gang Pan ; Michael D. Krom ; Meiyi Zhang ; Xianwei Zhang ; Lijing Wang ; Lichun Dai ; Yanqing Sheng ; Robert J. G. Mortimer
• 刊名：Environmental Science & Technology
• 出版年：2013
• 出版时间：September 3, 2013
• 年：2013
• 卷：47
• 期：17
• 页码：9685-9692
• 全文大小：486K
• 年卷期：v.47,no.17(September 3, 2013)
• ISSN：1520-5851

文摘

Phosphorus (P) in water and sediment in the Yellow River was measured for 21 stations from the source to the Bohai Sea in 2006鈥?007. The average total particulate matter (TPM) increased from 40 mg/L (upper reaches) to 520 mg/L (middle reaches) and 950 mg/L in the lower reaches of the river. The average dissolved PO₄ concentration (0.43 渭mol/L) was significantly higher than that in 1980鈥檚 but lower than the world average level despite high nutrient input to the system. Much of the P input was removed by adsorption, which was due to the high TPM rather than the surface activity of the particles since they had low labile Fe and low affinity for P. The sediment was a sink for P in the middle to lower reaches but not in the upper to middle reaches. TPM has been reduced by more than an order of magnitude due to artificial dams operating over recent decades. Modeling revealed that TPM of 0.2鈥? g/L was a critical threshold for the Yellow River, below which most of the phosphate input cannot be removed by the particles and may cause eutrophication. These findings are important for river management and land鈥搊cean modeling of global biogeochemical P cycling.