Nitrogen Cycling and Dynamics in Terrestrial Ecosystems

2018 ◽  
pp. 183-218
Author(s):  
David A.N. Ussiri ◽  
Rattan Lal
Keyword(s):  
Nitrogen Cycling ◽  
Terrestrial Ecosystems

Global change, soil biodiversity, and nitrogen cycling in terrestrial ecosystems: three case studies

1998 ◽  
Vol 4 (7) ◽  
pp. 729-743 ◽  
Author(s):  
M. J. SWIFT ◽  
O. ANDRÉN ◽  
L. BRUSSAARD ◽  
M. BRIONES ◽  
M. -M. COUTEAUX ◽  
...  
Keyword(s):  
Global Change ◽  
Nitrogen Cycling ◽  
Case Studies ◽  
Terrestrial Ecosystems ◽  
Soil Biodiversity

scholarly journals CONTROLS ON NITROGEN CYCLING IN TERRESTRIAL ECOSYSTEMS: A SYNTHETIC ANALYSIS OF LITERATURE DATA

2005 ◽  
Vol 75 (2) ◽  
pp. 139-157 ◽  
Author(s):  
Mary S. Booth ◽  
John M. Stark ◽  
Edward Rastetter
Keyword(s):  
Nitrogen Cycling ◽  
Terrestrial Ecosystems

scholarly journals Resistance and Resilience of Soil Nitrogen Cycling to Drought and Heat Stress in Rehabilitated Urban Soils

2021 ◽  
Vol 12 ◽  
Author(s):  
Mehdi Fikri ◽  
Catherine Joulian ◽  
Mikael Motelica-Heino ◽  
Marie-Paule Norini ◽  
Jennifer Hellal
Keyword(s):  
Organic Matter ◽  
Drought Stress ◽  
Microbial Communities ◽  
Nitrogen Cycling ◽  
Carbon Cycling ◽  
Urban Soils ◽  
Terrestrial Ecosystems ◽  
Soil Functions ◽  
Microbial Activities ◽  
Stress Changes

In the context of climate change and biodiversity loss, rehabilitation of degraded urban soils is a means of limiting artificialization of terrestrial ecosystems and preventing further degradation of soils. Ecological rehabilitation approaches are available to reinitiate soil functions and enhance plant development. However, little is known about the long-term stability of rehabilitated soils in terms of soil functions when further natural or anthropogenic perturbations occur. Based on rehabilitated urban soils, the present study sought to evaluate the resistance and resilience of soil functions linked to carbon cycling and phosphate dynamics in addition to nitrogen cycling and related microbial communities after a heat and drought stress. A laboratory experiment was conducted in microcosms under controlled temperature conditions, with four contrasted soils collected from a rehabilitated urban brownfield; an initial, non-rehabilitated soil (IS), a technosol with a high organic matter level (HO), and two technosols with less organic matter (LO1 and LO2), together with their respective controls (no stress). Changes in potential denitrification (PDR), nitrification (PNR) rates, and their interactive relationships with soil microbial activities and soil physicochemical properties were determined following a combined heat (40°C) and drought stress period of 21 days. Measurements were carried out immediately after the stress (resistance), and then also 5, 30, and 92 days after soil rewetting at 60% water holding capacity (resilience). Microbial activities involved in soil functions such as carbon cycling and phosphate dynamics proved to be of low resistance in all soils except for IS; however, they were resilient and recovered rapidly after rewetting. On the other hand, the microbial activities and gene abundances that were measured in relation to nitrogen cycling processes showed that for denitrification, activities were more rapidly resilient than gene abundances whereas for nitrification the activities and gene abundances were resilient in the same way. Results suggest that, unless the soils contain high amounts of organic matter, microbial communities in imported soils can be more vulnerable to environmental pressures such as drought and heat than communities already present. This should be considered when rehabilitating degraded soils.

Effects of elevated CO2 on nitrogen cycling in soil and alfalfa leaves

2020 ◽  
Author(s):  
Yuhan Zong ◽  
Jing Hu ◽  
Zhi Zhuang ◽  
Yuliang Li ◽  
Weiguo Liu
Keyword(s):  
Nitrogen Cycling ◽  
Nitrogen Cycle ◽  
Nitrogen Isotopes ◽  
Inorganic Nitrogen ◽  
Nitrogen Loss ◽  
Terrestrial Ecosystems ◽  
Ammonia Nitrogen ◽  
Scientific Basis ◽  
Plant Leaves ◽  
C3 Plant

<p>Increased atmospheric CO<sub>2</sub> concentration will have an significant impact on the nitrogen cycle of terrestrial ecosystems. The elevation of atmospheric CO<sub>2</sub> has become an inevitable trend, and nitrogen is the most important factor affecting plant growth. But it is rare to explore the effect of CO<sub>2</sub> on nitrogen cycle by measuring the value of δ<sup>15</sup>N. The δ<sup>15</sup>N value as a comprehensive indicator of the nitrogen cycle of the ecosystem, which can not only clarify the migration and transformation of nitrogen, but also effectively indicate the nitrogen limit and nitrogen open level of the ecosystem. Our experiment selected alfalfa (C3 plant) as the research object, then investigated the response of nitrate nitrogen, ammonia nitrogen and absorbable nitrogen to the elevated CO<sub>2</sub> concentration in soil and alfalfa leaves under ambient and elevated atmospheric CO<sub>2 </sub>(500 and 700ppm) in open top chambers. The <sup>15</sup>N isotope value was determined by bacterial denitrification , and <sup>15</sup>N-gas chromatography (GC-MS) were applied to further analyze the effect of elevated CO<sub>2</sub> concentration on nitrogen cycling in soil and plant leaves. The increase of CO<sub>2</sub> concentration led to the decline of various inorganic nitrogen levels in soil, and the δ<sup>15</sup>N in the soil also showed a certain downward trend, but always maintained a positive value. The nitrogen level and δ<sup>15</sup>N values in alfalfa leaves did not change significantly, showing a small increase. It indicates that there are different degrees of nitrogen loss in the leaves under the influence of different concentrations of CO<sub>2</sub>. These results are closely related to the fractional distillation of nitrogen isotopes caused by microorganisms in the process of nitrogen morphologic transformation. We briefly reviewed the changes of nitrogen content in soil and plant leaves under elevated CO<sub>2</sub>, providing new insights into the nitrogen cycle of soils and plants under high CO<sub>2</sub> concentrations. It also provides a scientific basis for the protection of soil and plants under the greenhouse effect.</p>

scholarly journals Applications of nitrogen stable isotope techniques in the study of nitrogen cycling in terrestrial ecosystems

2020 ◽  
Vol 44 (4) ◽  
pp. 373-383
Author(s):  
Yun-Ting FANG ◽  
Dong-Wei LIU ◽  
Fei-Fei ZHU ◽  
Ying TU ◽  
Shan-Long LI ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Nitrogen Cycling ◽  
Terrestrial Ecosystems ◽  
Nitrogen Stable Isotope ◽  
Isotope Techniques
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