scholarly journals Sediment–water inorganic nutrient exchange and nitrogen budgets in the Colne Estuary, UK

2007 ◽  
Vol 337 ◽  
pp. 63-77 ◽  
Author(s):  
DCO Thornton ◽  
LF Dong ◽  
GJC Underwood ◽  
DB Nedwell
Keyword(s):  
Inorganic Nutrient ◽  
Nitrogen Budgets ◽  
Nutrient Exchange ◽  
Colne Estuary

Investigation of the Contribution of Natural Organic Runoff to Dissolved Oxygen Depletion in the Red Deer River

1979 ◽  
Vol 14 (1) ◽  
pp. 71-88
Author(s):  
S.E. Penttinen ◽  
P.H. Bouthillier ◽  
S.E. Hrudey
Keyword(s):  
Dissolved Oxygen ◽  
Red Deer ◽  
Stream Water ◽  
Oxygen Demand ◽  
Oxygen Depletion ◽  
Experimental Program ◽  
Nitrogen Budgets ◽  
Carbon And Nitrogen ◽  
Tributary Stream ◽  
Small Tributary

Abstract Studies on the chronic low dissolved oxygen problems encountered under winter ice in the Red Deer River have generally been unable to account for dissolved oxygen depletion in terms of known manmade inputs. An experimental program was developed to assess the possible nature and approximate bounds of oxygen demand due to natural organic runoff carried to the Red Deer River by a small tributary stream, the Blindman River. The study employed an electrolytic respirometer on stream water samples subjected to prior concentration by vacuum evaporation. Evaluation of carbon and nitrogen budgets in conjunction with the measured oxygen demand indicate that biochemical oxygen demand is originating with natural organic runoff in tributaries of the Red Deer River. The results provide a basis for estimation of the possible contribution to the observed oxygen demand in the Red Deer River originating from natural organic runoff.

scholarly journals Urban nitrogen budgets: flows and stock changes of potentially polluting nitrogen compounds in cities and their surroundings – a review

2020 ◽  
Vol 17 (1) ◽  
pp. 57-71
Author(s):  
Wilfried Winiwarter ◽  
Barbara Amon ◽  
Zhaohai Bai ◽  
Andrzej Greinert ◽  
Katrin Kaltenegger ◽  
...  
Keyword(s):  
Nitrogen Compounds ◽  
Nitrogen Budgets

scholarly journals Spatiotemporal Dynamics of Nitrogen Budgets under Anthropogenic Activities in Metropolitan Areas

2021 ◽  
Vol 13 (4) ◽  
pp. 2006
Author(s):  
Ning Ding ◽  
Jingfeng Zhu ◽  
Xiao Li ◽  
Xiangrong Wang
Keyword(s):  
Anthropogenic Activities ◽  
River System ◽  
Yangtze River Delta ◽  
Fertilizer Efficiency ◽  
Land Use Pattern ◽  
Human Disturbances ◽  
Nitrogen Budgets ◽  
Metropolitan Regions ◽  
Close Relationship ◽  
Anthropogenic Nitrogen

The rapid growth of metropolitan regions is closely associated with high nitrogen (N) flows, which is known as the most important reason for widespread water pollution. It is, therefore, crucial to explore the spatiotemporal patterns of N budgets under intensive human activity. In this study, we estimated the long-term (2000–2015) N budgets by integrating the net anthropogenic nitrogen input (NANI) and the export coefficient model (ECM) in the Yangtze River Delta Urban Agglomeration (YRDUA), a typical metropolitan area with strong human disturbances. The results revealed that the NANI decreased by 10% from 2000 to 2015, while N exports showed a 6% increase. Hotspots for N budgets were found in the northeastern areas, where cropland and construction land were dominant. The linear regression showed a close relationship between the NANI and N export, and about 18% of the NANI was exported into the river system. By revealing the critical sources and drivers of N budgets over time, our work aimed to provide effective information for regional policy on nitrogen management. Future strategies, such as improving the fertilizer efficiency, optimizing the land use pattern, and controlling the population density, are necessary in order to address the environmental challenge concerns of excessive N.

scholarly journals The influence of organic and inorganic nutrient inputs on soil organic carbon functional groups content and maize yields

Heliyon ◽  
2021 ◽  
Vol 7 (8) ◽  
pp. e07881
Author(s):  
M. Ndung'u ◽  
L.W. Ngatia ◽  
R.N. Onwonga ◽  
M.W. Mucheru-Muna ◽  
R. Fu ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Functional Groups ◽  
Inorganic Nutrient ◽  
Nutrient Inputs ◽  
Maize Yields

Inorganic nutrient concentrations and physiological pitting in ‘Hayward’ kiwifruit

2003 ◽  
Vol 78 (4) ◽  
pp. 497-504 ◽  
Author(s):  
I. B. Ferguson ◽  
T. G. Thorp ◽  
A. M. Barnett ◽  
L. M. Boyd ◽  
C. M. Triggs
Keyword(s):  
Inorganic Nutrient ◽  
Nutrient Concentrations
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