Separating the Driving Force on Estuary Nutrient Evolution,Clean - Soil Air Water

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Separating the Driving Force on Estuary Nutrient Evolution
Clean - Soil Air Water ( IF 1.5 ) Pub Date : 2020-08-18 , DOI: 10.1002/clen.202000274
Hua Wang _{1,

2} , Weihao Yuan _{1,

2} , Huaiyu Yan _{1,

2} , Fengnian Zhou ₃ , Bao Li ₃ , Wei Zhuang ₄ , Yichuan Zeng _{1,

2} , John Paul Kaisam _{1,

2}

Affiliation

The Yangtze river estuary (YRE) of China is selected as the research area. The evolution of nutrient load in YRE from 2004 to 2016 is examined against field investigated data. The entropy value‐based method is proposed to decouple the forces driving the dynamics of the nutrients. The results indicated that: 1) The nutrient driving force sequence in YRE is mainstream boundary (MB, 34.57%) > regional pollutant boundary (PB, 34.48%) > self‐purification (SP, 20.26%) > sediment release (SR, 7.00%) > atmospheric deposition (AD, 3.68%). 2) The strength of the MB is weakened by the decreasing distance to the entrance of the river and the geographical position is significantly correlated with the force of the PB. 3) The weight of SP range from 13.8% to 28.3% and the seasons have important influence for SP force. In flood seasons SP is strengthened by 12.3% on average. 4) SR and AD do not play a significant role in the nutrient evolution, but forces fluctuated with space‐time conditions. 5) As different forms of nutrients undergo different physical, chemical, and biological processes in water, the forces varied with nutrient factors.

更新日期：2020-10-05

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