Reconstructing historical changes in phosphorus inputs to rivers from point and nonpoint sources in a rapidly developing watershed in eastern China, 1980–2010

Chen, Dingjiang; Hu, Minpeng; Guo, Yi; Dahlgren, Randy A.

doi:10.1016/j.scitotenv.2015.06.079

Cited by 31 publications

(16 citation statements)

References 38 publications

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“…Due to legacy P contributions, field studies indicated that even without additional fertilizer application, a decade or more of ''P draw down" from agricultural soil P reserves would be required to substantially reduce P in runoff Sharpley et al, 2013). Modeling results also indicated that in-stream remobilization of legacy P could account for 21-26% of annual riverine TP load in two Illinois Rivers (Jarvie et al, 2012) and 2-29% in the Yongan River in eastern China (Chen et al, 2015b). Several investigations conducted in urban streams suggested that enrichment of soluble-reactive P in groundwater due to sewage leaching can contribute a considerable proportion of riverine P flux, especially during the low flow season (Roy and Bickerton, 2014;Fitzgerald et al, 2015).…”

Section: Riverine Tp Source Apportionmentmentioning

confidence: 99%

“…In addition, groundwater might be an additional sink of transiently stored P in residential areas (Roy and Bickerton, 2014;Fitzgerald et al, 2015). Phosphorus sorption in bottom sediments of ditches, streams and rivers may be another important P sink, especially when water velocity is slow and the sediment P sorption capacity is not saturated Jarvie et al, 2013;Chen et al, 2015b). …”

Section: Fates Of Surplus Phosphorusmentioning

confidence: 99%

“…To reduce NAPI R , it would be advantageous to promote recycling of human and domestic animal solid wastes to replace chemical fertilizer use on croplands. Since P in wastewater effluent is generally in soluble and biologically-available forms (Sobota et al, 2011;Chen et al, 2015b), targeting human and domestic animal sewage (treated sludge can be used for fertilizing croplands) serves a potential role in reducing eutrophication and hypoxia.…”

Section: Forecasting Future Riverine Phosphorus Exportsmentioning

confidence: 99%

“…As a result, residential systems have a higher potential to export NAPI than agricultural/ forest systems. This is especially true in developing countries where efficient treatment of residential wastewater/stormflows and agricultural subsurface drainage are both often lacking (Hou et al, 2013;Chen et al, 2015b); thus human and animal wastes usually act as a major source of riverine P load in several regions in eastern China (Hou et al, 2013;Yuan et al, 2014). Therefore, it is valuable to separate watershed agricultural/forest and residential P budgets to effectively identify their relative contributions to riverine P fluxes.…”

Section: Introductionmentioning

confidence: 99%

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Factors controlling phosphorus export from agricultural/forest and residential systems to rivers in eastern China, 1980–2011

Chen

Wang

et al. 2016

Journal of Hydrology

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s u m m a r yThis study quantified long-term response of riverine total phosphorus (TP) export to changes in land-use, climate, and net anthropogenic phosphorus inputs to agricultural/forest (NAPI AF ) and residential (NAPI R ) systems for the upper Jiaojiang watershed in eastern China. Annual NAPI AF rose by 73% in 1980-1999 followed by a 41% decline in 2000-2011, while NAPI R continuously increased by 122% over the 1980-2011 period. Land-use showed a 63% increase in developed land area (D%) and a 91% increase in use of efficient drainage systems on agricultural land area (AD%) over the study period. Although no significant trends were observed in annual river discharge or precipitation, the annual number of storm events rose by 90% along with a 34% increase in the coefficient of variation of daily rainfall. In response to changes of NAPI AF , NAPI R , land-use and precipitation patterns, riverine TP flux increased 16.0-fold over the 32-year record. Phosphorus export via erosion and leaching was the dominant pathway for P delivery to rivers. An empirical model incorporating annual NAPI AF , NAPI R , precipitation, D%, and AD% was developed (R 2 = 0.96) for apportioning riverine TP sources and predicting annual riverine TP fluxes. The model estimated that NAPI AF , NAPI R and legacy P sources contributed 19-56%, 16-67% and 13-32% of annual riverine TP flux in 1980-2011, respectively. Compared to reduction of NAPI AF , reduction of NAPI R was predicted to have a greater immediate impact on decreasing riverine TP fluxes. Changes in anthropogenic P input sources (NAPI AF vs. NAPI R ), land-use, and precipitation patterns as well as the legacy P source can amplify P export from landscapes to rivers and should be considered in developing P management strategies to reduce riverine P fluxes.

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Section: Riverine Tp Source Apportionmentmentioning

confidence: 99%

Section: Fates Of Surplus Phosphorusmentioning

confidence: 99%

Section: Forecasting Future Riverine Phosphorus Exportsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Factors controlling phosphorus export from agricultural/forest and residential systems to rivers in eastern China, 1980–2011

Chen

Wang

et al. 2016

Journal of Hydrology

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“…Input of excessive phosphorus (P) from non-point source wastewater is an important cause for eutrophication of surface water bodies, such as lakes, rivers, reservoirs etc., and thus pose many environmental, economic and social problems (Chen et al, 2015;Schindler et al, 2008;Smith & Schindler, 2009). As a result, many technologies are currently in place to remove excess P from wastewaters, among them biological methods using phototrophic periphyton is a subject of great concern (Boelee et al, 2011;Guzzon et al, 2008;Roeselers et al, 2008;Shi et al, 2007;Sukačová et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Phototrophic periphyton techniques combine phosphorous removal and recovery for sustainable salt-soil zone

Feng

et al. 2016

Science of The Total Environment

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• Phototrophic periphyton is effective in removing P (P o and P i ) from wastewaters.• Adsorption with physiochemical characteristic dominated P removal mechanism by periphyton.• The P within periphyton is mainly in forms of Labile-P and Ca-P.• The periphyton has vast potential application in recovering P for salt-soil zone The P (P i as KH 2 PO 4 and P o as ATP) removal processes by phototrophic periphyton were investigated by determining the removal kinetics, metal content (Ca, Mg, Al, Fe, Cu, and Zn) of the solution and P fractions (Labile-P, Fe/Al-P, Ca-P, and Res-P) within the periphyton. Results showed that the periphyton was able to remove completely both P i and P o after 48 h when periphyton content was greater than 0.2 g L −1 (dry weight). The difference between P i and P o removal was the conversion of P o into P i by the periphyton, after that the removal mechanism was similar. The P removal mechanism was mainly due to the adsorption on the surfaces of the periphyton, including two aspects: i) the adsorption of PO 4 3− onto metal salts such as calcium carbonate (~50%) and ii) complexation between PO 4 3− and metal cations such as Ca 2+ (~40%). However, this bio-adsorptional process was significantly influenced by the extracellular polymeric substance (EPS) of periphyton, water hardness, initial G R A P H I C A L A B S T R A C T a b s t r a c t a r t i c l e i n f oKeywords:Science of the Total Environment 568 (2016) 838-844Abbreviations: α, the initial adsorption rate (mg g −1 h −1 ); β, the desorption constant (g mg −1 ); m, mass of adsorbent (g); t, time (h); C, the constant of boundary layer effect; H, Shannon index; R, ideal gas constant (8.314 J mol −1 K −1 ); T, temperature (K); V, the volume of solutions (L); k 1 , pseudo-first-order kinetic model rate constant (h −1 ); k 2 , pseudosecond-order kinetic model rate constant (mg g −1 h −1 ); q e , the amount of P adsorbed onto the periphyton at equilibrium (mg g −1 ); q e,cal , the amount of P adsorbed onto the periphyton calculated by model at equilibrium (mg g −1 ); q m , the maximum adsorption capacity for the periphyton (mg g −1 ); q t , the amount of P adsorbed onto the periphyton at time t (mg g −1 ); C 0 , initial P concentration (mg L −1 ); K id , intraparticle rate constant (mg g −1 h -0.5 ); P i , inorganic phosphorus (mg L −1 ); P o , organic phosphorus (mg L −1 ); TP, the total phosphorus content (mg L −1 ); R 2 , linear regression coefficient; ANSW, artificial non-point source wastewater; ATP, disodium adenosine triphosphate (C 10 H 14 O 13 N 5 P 3 Na 2 ·3H 2 O); DW, dry weight of the periphyton (g); EPS, extracellular polymeric substance of the periphyton; PDW, pure distilled water.⁎ Contents lists available at ScienceDirectScience of the Total Environment j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / s c i t o t e n v P concentration, temperature and light intensity. This study not only deepens the understanding of P biogeochemical process in aquatic ecosystem, but provides a potential biomaterial...

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Anthropogenic Phosphorus Inputs to a River Basin and Their Impacts on Phosphorus Fluxes Along Its Upstream‐Downstream Continuum

et al. 2017

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The increasing trend in riverine phosphorus (P) loads resulting from anthropogenic inputs has gained wide attention because of the well‐known role of P in eutrophication. So far, however, there is still limited scientific understanding of anthropogenic P inputs and their impacts on riverine flux in river reaches along the upstream‐to‐downstream continuum. Here we investigated P budgets in a series of nested watersheds draining into Hongze Lake of China and developed an empirical function to describe the relationship between anthropogenic inputs and riverine P fluxes. Our results indicated that there are obvious gradients regarding P budgets in response to changes in human activities. Fertilizer application and food and feed P import was always the dominant source of P inputs in all sections, followed by nonfood P. Further interpretation using the model revealed the processes of P loading to the lake. About 2%–9% of anthropogenic P inputs are transported from the various sections into the corresponding tributaries of the river systems, depending upon local precipitation rates. Of this amount, around 41%–95% is delivered to the main stem of the Huai River after in‐stream attenuation in its tributaries. Ultimately, 55%–86% of the P loads delivered to different locations of the main stem are transported into the receiving lake of the downstream, due to additional losses in the main stem. An integrated P management strategy that considers the gradients of P loss along the upstream‐to‐downstream continuum is required to assess and optimize P management to protect the region's freshwater resource.

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Reconstructing historical changes in phosphorus inputs to rivers from point and nonpoint sources in a rapidly developing watershed in eastern China, 1980–2010

Cited by 31 publications

References 38 publications

Factors controlling phosphorus export from agricultural/forest and residential systems to rivers in eastern China, 1980–2011

Factors controlling phosphorus export from agricultural/forest and residential systems to rivers in eastern China, 1980–2011

Phototrophic periphyton techniques combine phosphorous removal and recovery for sustainable salt-soil zone

Anthropogenic Phosphorus Inputs to a River Basin and Their Impacts on Phosphorus Fluxes Along Its Upstream‐Downstream Continuum

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