scholarly journals Modelling soil nitrogen: The MAGIC model with nitrogen retention linked to carbon turnover using decomposer dynamics

2012 ◽  
Vol 165 ◽  
pp. 158-166 ◽  
Author(s):  
F. Oulehle ◽  
B.J. Cosby ◽  
R.F. Wright ◽  
J. Hruška ◽  
J. Kopáček ◽  
...  
Keyword(s):  
Soil Nitrogen ◽  
Nitrogen Retention ◽  
Carbon Turnover ◽  
Magic Model

Phosphorus availability and plants alter soil nitrogen retention and loss

2019 ◽  
Vol 671 ◽  
pp. 786-794 ◽  
Author(s):  
Kazi R. Mehnaz ◽  
Claudia Keitel ◽  
Feike A. Dijkstra
Keyword(s):  
Soil Nitrogen ◽  
Nitrogen Retention ◽  
Phosphorus Availability

scholarly journals Modelling the effects of acid deposition: refinements, adjustments and inclusion of nitrogen dynamics in the MAGIC model

2001 ◽  
Vol 5 (3) ◽  
pp. 499-518 ◽  
Author(s):  
B. J. Cosby ◽  
R. C. Ferrier ◽  
A. Jenkins ◽  
R. F. Wright
Keyword(s):  
Acid Deposition ◽  
Acidic Deposition ◽  
Nitrogen Retention ◽  
Conceptual Structure ◽  
Nitrogen Dynamics ◽  
Model Structure ◽  
Short Term ◽  
Magic Model ◽  
Acidification And Recovery

Abstract. The MAGIC model of the responses of catchments to acidic deposition has been applied and tested extensively over a 15 year period at many sites and in many regions around the world. Overall, the model has proven to be robust, reliable and useful in a variety of scientific and managerial activities. Over the years, several refinements and additions to MAGIC have been proposed and/or implemented for particular applications. These adjustments to the model structure have all been included in a new version of the model (MAGIC7). The log aluminium – pH relationship now does not have to be fixed to aluminium trihydroxide solubility. Buffering by organic acids using a triprotic analog is now included. Dynamics of nitrogen retention and loss in catchments can now be linked to soil nitrogen and carbon pools. Simulation of short-term episodic response by mixing fractions of different water types is also possible. This paper presents a review of the conceptual structure of MAGIC7 relating to long-term simulation of acidification and recovery, describes the conceptual basis of the new nitrogen dynamics and provides a comprehensive update of the equations, variables, parameters and inputs for the model. Keywords: process-based model, acid deposition, recovery

Sewage sludge-derived hydrochar that inhibits ammonia volatilization, improves soil nitrogen retention and rice nitrogen utilization

Chemosphere ◽  
2020 ◽  
Vol 245 ◽  
pp. 125558 ◽  
Author(s):  
Qingnan Chu ◽  
Lihong Xue ◽  
Bhupinder Pal Singh ◽  
Shan Yu ◽  
Karin Müller ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Soil Nitrogen ◽  
Ammonia Volatilization ◽  
Nitrogen Retention ◽  
Nitrogen Utilization

Different nitrogen and biochar sources’ application in an alkaline calcareous soil improved the maize yield and soil nitrogen retention

2019 ◽  
Vol 12 (21) ◽  
Author(s):  
Muhammad Farooq Qayyum ◽  
Mehak Ameer Abdullah ◽  
Muhammad Rizwan ◽  
Ghulam Haider ◽  
Muhammad Arif Ali ◽  
...  
Keyword(s):  
Soil Nitrogen ◽  
Calcareous Soil ◽  
Nitrogen Retention ◽  
Maize Yield

Soil nitrogen retention is increased by ditch-buried straw return in a rice-wheat rotation system

2015 ◽  
Vol 69 ◽  
pp. 52-58 ◽  
Author(s):  
Haishui Yang ◽  
Bing Yang ◽  
Yajun Dai ◽  
Mingmin Xu ◽  
Roger T. Koide ◽  
...  
Keyword(s):  
Soil Nitrogen ◽  
Nitrogen Retention ◽  
Rotation System ◽  
Straw Return

scholarly journals Environmental Implications of Municipal Dump Site on Soil Nitrogen in Calabar Metropolis, Nigeria

2021 ◽  
Vol 12 (6) ◽  
pp. 116
Author(s):  
Victoria Francis Ediene ◽  
Linus Beba Akeh ◽  
Otobong Benjamin Iren ◽  
Sunday Marcus Afu ◽  
Ene Emmanuel Aki ◽  
...  
Keyword(s):  
Soil Nitrogen ◽  
Ghg Emissions ◽  
Nitrogen Retention ◽  
Control Site ◽  
Dry Season ◽  
Valley Floor ◽  
Municipal Waste ◽  
Wet Season ◽  
Environmental Implications ◽  
Dump Site

Organic matter exhibit strong variations in nitrogen retention and transformation cycle in soil. However, nitrogen could be altered by seasonal variations, leading us to hypothesize that the open municipal waste dump site in Calabar exposed to dry and wet season could alter nitrogen dynamics in that soil. A total of sixty  (60) composite soil samples were collected at different landscape positions (summit crest, shoulder slope, toe slope, interfluve slope, valley floor) of a municipal dump site and a control (no refuse area) during the dry and wet seasons in Calabar and analyzed to ascertain the effects on forms and status of soil nitrogen. The soils were loamy sand across the study location with pH values of 4.50, 7.00, 6.70, 7.30, 5.00, 7.30 (dry season) and 5.00. 7.30, 7.00, 7.40, 5.90, 7.40 (wet season) for the control, summit crest, shoulder slope, toe slope, interfluve slope and valley floor accordingly. Values obtained for total nitrogen (N) from the study site were generally low (<0.21 %), with values for dry season slightly higher than the wet season. NH4+ recorded higher content in wet  than in dry season with values ranging between 12.11-14.11 mg/kg (control), 14.60 - 15.90 mg/kg (Summit crest); 18.25 - 20.05 mg/kg (Shoulder slope), 18.30 - 20.20 mg/kg (Toe slope), 12.30 - 14.00 mg/kg (Interfluve slope) and  9.24 -11.07 mg/kg (Valley floor). The Shoulder and toe slopes recorded the highest NH4+ concentration in the wet season. N02- contents documented for the control site were within the ranges of 2.78- 3.20 and 3.22-3.62 mg/kg while the dumpsite had values between 2.49-3.45 and 2.98 -3.22 mg/kg was observed for the shoulder position, the toe slope contained between 2.30-2.75 and 2.70 -2.82 mg/kg, the inter fluve slope had similar ranges of 2.32-2.90 and 2.70-3.08 mg/kg, and the valley floor 2.45-2.60 and 2.78-2.98 mg/kg. N02- values were higher for the wet than dry season. NO3- nitrogen was observed to be excessive across the dumpsite with the highest values > 80 mg/kg obtained at the valley floor. The NO3- values were higher in dry season across the all the landscape positions than in the wet season. The values were equally higher for the dumpsite than the control. It was observed that the dumpsite soils contend excessive NO3- which could be converted to nitrous oxide (N2O) thus contributing to green house (GHG) emissions.  It was also noted that seasonal variation did not significantly affect the N content at the different landscape positions of the municipal dumpsite in Calabar. It is highly recommended that municipal waste be sorted and the organic materials composted to harness the rich NO3- content as observed in this research.   Received: 22 September 2021 / Accepted: 25 October 2021 / Published: 5 November 2021

Non-labile Soil Nitrogen Retention beneath Three Tree Species in a Tropical Plantation

2002 ◽  
Vol 66 (2) ◽  
pp. 612 ◽  
Author(s):  
Jason P. Kaye ◽  
Dan Binkley ◽  
Xiaoming Zou ◽  
John A. Parrotta
Keyword(s):  
Soil Nitrogen ◽  
Tree Species ◽  
Nitrogen Retention ◽  
Tropical Plantation
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