Litterfall and nitrogen turnover in an Amazonian blackwater inundation forest

1982 ◽  
Vol 67 (1-3) ◽  
pp. 355-358 ◽  
Author(s):  
U. Irmler
Keyword(s):  
Nitrogen Turnover ◽  
Inundation Forest

scholarly journals Different forms of nitrogen deposition show variable effects on soil organic nitrogen turnover in a temperate forest

2022 ◽  
Vol 169 ◽  
pp. 104212
Author(s):  
Jihui Tian ◽  
Kai Wei ◽  
Tao Sun ◽  
Nan Jiang ◽  
Zhenhua Chen ◽  
...  
Keyword(s):  
Nitrogen Deposition ◽  
Temperate Forest ◽  
Organic Nitrogen ◽  
Soil Organic Nitrogen ◽  
Nitrogen Turnover

scholarly journals Change of mineral and organic nitrogen forms in a long term fertilization experiment (literature)

2014 ◽  
pp. 43-47
Author(s):  
Judit Horváth ◽  
János Kátai
Keyword(s):  
Organic Nitrogen ◽  
Inorganic Nitrogen ◽  
Essential Element ◽  
Nitrogen Forms ◽  
Organic Form ◽  
The Sustainable Development ◽  
Nitrogen Turnover ◽  
Mineralization Processes ◽  
Living Organisms

The research topic has timeliness, since the rational utilization and protection of the soil, besides the conservation of its diverse functions is part of the sustainable development. Research of the long-term experiments is esentially important, because it can model the term effects in the same place, under the same conditions. If we want to get accurate informations about the occured changes, way and danger of changes, we should track the resupply and effect of the mineral nutrients and the removed quantity of nutrients with the harvest. Nitrogen is an essential element for living organisms, it is present in the soil mainly in organic form. In general only only a low percentage of the total nitrogent content can be used directly by plants in the soil. This inorganic nitrogen is produced by the transformation of organic contents through mineralization processes and it get into the soil by the fertilization. The plants incorporote the mineral nitrogen into our bodies. This is how nitrogen turnover is realized when mineral forms become organic and organic forms become mineral. The purpose of our paper is to make a literature before our research.

scholarly journals Suspended Particular Matter drives the spatial segregation of nitrogen turnover along the hyper-turbid Ems estuary

2021 ◽  
Author(s):  
Gesa Schulz ◽  
Tina Sanders ◽  
Justus E. E. van Beusekom ◽  
Yoana G. Voynova ◽  
Andreas Schöl ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Nitrous Oxide ◽  
Water Column ◽  
Anthropogenic Activities ◽  
Inorganic Nitrogen ◽  
Nitrate Removal ◽  
Tidal River ◽  
Nutrient Loads ◽  
Ems Estuary ◽  
Nitrogen Turnover

Abstract. Estuaries are nutrient filters and change riverine nutrient loads before they reach coastal oceans. They have been extensively changed by anthropogenic activities like draining, deepening, and dredging to meet economic and social demand, causing significant regime changes like tidal amplifications and in some cases to hyper-turbid conditions. Furthermore, increased nutrient loads, especially nitrogen, mainly by agriculture cause coastal eutrophication. Estuaries can either act as a sink or as a source of nitrate, depending on environmental and geomorphological conditions. These factors vary along an estuary, and change nitrogen turnover in the system. Here, we investigate the factors controlling nitrogen turnover in the hyper-turbid Ems estuary (Northern Germany) that has been strongly impacted by human activities. During two research cruises in August 2014 and June 2020, we measured water column properties, dissolved inorganic nitrogen, dual stable isotopes of nitrate and dissolved nitrous oxide concentration along the estuary. Overall, the Ems estuary acts as a nitrate sink in both years. However, three distinct biogeochemical zones exist along the estuary. A strong fractionation (~ 26 ‰) of nitrate stable isotopes points towards nitrate removal via water column denitrification in the hyper-turbid Tidal River, driven by anoxic conditions in deeper water layers. In the Middle Reaches of the estuary nitrification gains in importance turning this section into a net nitrate source. The Outer Reaches are dominated by mixing with nitrate uptake in 2020. We find that the overarching control on biogeochemical nitrogen cycling, zonation and nitrous oxide production in the Ems estuary is exerted by suspended particulate matter concentrations and the linked oxygen deficits.

The use of the 13 C and 15 N isotopes for the simultaneous measurement of carbon and nitrogen turnover rates in marine phytoplankton1

1977 ◽  
Vol 22 (5) ◽  
pp. 925-932 ◽  
Author(s):  
Gerd Slawyk ◽  
Yves Collos ◽  
Jean-Christian Auclair
Keyword(s):  
Simultaneous Measurement ◽  
Turnover Rates ◽  
Carbon And Nitrogen ◽  
Nitrogen Turnover ◽  
N Isotopes

scholarly journals Anaerobic Nitrogen Turnover by Sinking Diatom Aggregates at Varying Ambient Oxygen Levels

2016 ◽  
Vol 7 ◽  
Author(s):  
Peter Stief ◽  
Anja Kamp ◽  
Bo Thamdrup ◽  
Ronnie N. Glud
Keyword(s):  
Oxygen Levels ◽  
Nitrogen Turnover ◽  
Ambient Oxygen

Nitrogen turnover in alternatives to peat

1996 ◽  
pp. 27-30 ◽  
Author(s):  
Ian G. Burns ◽  
Mary K. Turner
Keyword(s):  
Nitrogen Turnover

Spatially explicit modelling of floodplain forest succession: interactions among flood inundation, forest successional processes, and other disturbances in the Upper Mississippi River floodplain, USA

2019 ◽  
Vol 405 ◽  
pp. 15-32 ◽  
Author(s):  
Nathan R. De Jager ◽  
Molly Van Appledorn ◽  
Timothy J. Fox ◽  
Jason J. Rohweder ◽  
Lyle J. Guyon ◽  
...  
Keyword(s):  
Mississippi River ◽  
Forest Succession ◽  
Floodplain Forest ◽  
Spatially Explicit ◽  
Flood Inundation ◽  
Upper Mississippi River ◽  
River Floodplain ◽  
Inundation Forest

Annual dynamics of soil gross nitrogen turnover and nitrous oxide emissions in an alpine shrub meadow

2019 ◽  
Vol 138 ◽  
pp. 107576
Author(s):  
Xiaoxia Hu ◽  
Chunyan Liu ◽  
Xunhua Zheng ◽  
Michael Dannenmann ◽  
Klaus Butterbach-Bahl ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Nitrous Oxide Emissions ◽  
Nitrogen Turnover ◽  
Alpine Shrub
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