δ15N natural abundance may directly disclose perturbed soil when related to C:N ratio

2013 ◽  
Vol 27 (10) ◽  
pp. 1101-1104 ◽  
Author(s):  
Franz Conen ◽  
Mikhail V. Yakutin ◽  
Nina Carle ◽  
Christine Alewell
Keyword(s):  
C:N Ratio ◽  
Natural Abundance ◽  
Δ15n Natural Abundance

Variability in δ15N natural abundance of basal resources in fluvial ecosystems: a meta-analysis

2012 ◽  
Vol 31 (3) ◽  
pp. 1003-1015 ◽  
Author(s):  
Marc Peipoch ◽  
Eugènia Martí ◽  
Esperança Gacia
Keyword(s):  
Meta Analysis ◽  
Natural Abundance ◽  
Basal Resources ◽  
Δ15n Natural Abundance ◽  
Fluvial Ecosystems

Soil nitrogen status and turnover in subtropical leucaena-grass pastures as quantified by δ15N natural abundance

Geoderma ◽  
2018 ◽  
Vol 313 ◽  
pp. 126-134 ◽  
Author(s):  
Kathryn A. Conrad ◽  
Ram C. Dalal ◽  
Scott A. Dalzell ◽  
Diane E. Allen ◽  
Ryosuke Fujinuma ◽  
...  
Keyword(s):  
Soil Nitrogen ◽  
Natural Abundance ◽  
Nitrogen Status ◽  
Δ15n Natural Abundance

Long-term changes of the δ15N natural abundance of plants and soil in a temperate grassland

2009 ◽  
Vol 325 (1-2) ◽  
pp. 157-169 ◽  
Author(s):  
Melanie Kriszan ◽  
Wulf Amelung ◽  
Jürgen Schellberg ◽  
Thomas Gebbing ◽  
Walter Kühbauch
Keyword(s):  
Temperate Grassland ◽  
Natural Abundance ◽  
Long Term Changes ◽  
Δ15n Natural Abundance

scholarly journals Interspecific variation and impact of clear-cutting on natural 15N abundance and N concentration in the needle-to-soil continuum of a boreal conifer forest

2008 ◽  
Vol 53 (No. 8) ◽  
pp. 329-339 ◽  
Author(s):  
S.P. Sah ◽  
H. Ilvesniemi
Keyword(s):  
Interspecific Variation ◽  
Natural Forest ◽  
Natural Abundance ◽  
Pine Needles ◽  
Organic Layer ◽  
Clear Cut ◽  
Clear Cutting ◽  
Mature Forest ◽  
Δ15n Natural Abundance ◽  
Spruce Needles

The primary objective of this paper is to study the interspecific variation of <sup>15</sup>N natural abundance in two dominant conifer tree species, Scot pine (<i>Pinus sylvestris</i> L.) and Norway spruce (<i>Picea abies</i> L. Karst) in a N-limited mixed boreal coniferous forest in southern Finland. Both a mature tree stand (a natural forest stand) and a stand of seedlings in a clear-cut area were considered. We analyzed %N and δ15N natural abundance in needles, branches, litter and soil of the both above-mentioned stands. Pine needles had higher N concentrations than spruce needles, both in mature forest (pine = 1.09%, SE ± 0.02 and spruce = 0.79%, SE ± 0.02) and in the clear-cut area (pine = 1.01%, SE ± 0.07 and spruce = 0.74%, SE ± 0.04). Furthermore, pine needles were significantly more depleted in δ15N natural abundance than the spruce needles, both in the mature forest (pine = –5.6‰, SE ± 0.1‰ and spruce = –4.0‰, SE ± 0.2‰) and in the clear-cut sites (pine = –2.8‰, SE ± 0.2‰ and spruce = –2.1‰, SE ± 0.3‰). The more pronounced depletion of <sup>15</sup>N in the pine foliage might be connected to its different fungal associates in the roots compared to spruce roots. We assume that the mycorrhizal N-uptake is very prominent at the N-limited site. After clear-cutting, needles of the seedlings and the uppermost part of soil organic layer were found to be more 15N-enriched than at the natural forest site. This was attributed to an increased level of nitrification in the clear-cut site soil.

FERTILIZATION SYSTEM AS A WAY OF SOIL FERTILITY AND STABILIZATION OF FIELD CROP ROTATION PRODUCTIVENESS

1970 ◽  
pp. 38-41
Author(s):  
V. T. Sinegovskaya ◽  
E. T. Naumchenko
Keyword(s):  
Soil Fertility ◽  
Crop Rotation ◽  
C:N Ratio ◽  
Mineral Fertilizer ◽  
Organic Fertilizers ◽  
Nitrogen And Phosphorus ◽  
Rotation System ◽  
Mobile Phosphorus ◽  
Crop Rotation System ◽  
Fertilizer System

The article presents the results of comparative evaluation of the efficiency of the long-term application of mineral and organic fertilizers in the crop rotation system. It was found that the application of the mineral fertilizer system increased the value of hydrolytic acidity of the soil from 4,30 to 5,29 mg-eq per 100 g of soil, the indicator of metabolic acidity decreased from 5,2 to 4,9 pH units. By the end of the 11th rotation for both fertilizer systems, the content of mobile phosphorus increased by more than 4 times relative to the initial value, its mobility indicator – by 2,2-3,2 times compared with the control. The use of the organo-mineral system was accompanied by an increase in the content of humus by 0,35 % and a decrease in the C:N ratio from 11,2 to 8,9. The increased productivity of wheat was revealed when applying nitrogen and nitrogen-phosphorus fertilizers against the background of prolonged use of the mineral and organo-mineral fertilizer system. The change in wheat productivity by 56 % depended on the content of mineral nitrogen, mobile phosphorus, humus in the topsoil, and on the phosphate ion mobility. Soybean productivity depended on soil fertility indicators only by 24 %: the relationship between soybean productivity and the mineral forms of nitrogen and phosphorus is weak and direct, between productivity and P2O5 mobility - weak and inverse, with humus - moderate and direct.

ATMOSPHERIC N DEPOSITION TO THE COASTAL AREA OF THE BLACK SEA: SOURCES, INTRA-ANNUAL VARIATIONS AND IMPORTANCE FOR BIOGEOCHEMISTRY AND PRODUCTIVITY OF THE SURFACE LAYER

2017 ◽  
Author(s):  
Alla Varenik ◽  
Alla Varenik ◽  
Sergey Konovalov ◽  
Sergey Konovalov
Keyword(s):  
Primary Production ◽  
Black Sea ◽  
Marine Ecosystem ◽  
C:N Ratio ◽  
N Deposition ◽  
Local Source ◽  
The Black Sea ◽  
Coastal Zones ◽  
Atmospheric N Deposition ◽  
Urban Location

Atmospheric precipitations can be an important source of nutrients to open and coastal zones of marine ecosystem. Jickells [1] has published that atmospheric depositions can sup-port 5-25% of nitrogen required to primary production. Bulk atmospheric precipitations have been collected in a rural location at the Black Sea Crimean coast – Katsiveli settlement, and an urban location – Sevastopol city. Samples have been analyzed for inorganic fixed nitrogen (IFN) – nitrate, nitrite, and ammonium. Deposi-tions have been calculated at various space and time scales. The monthly volume weighted mean concentration of IFN increases from summer to winter in both locations. A significant local source of IFN has been revealed for the urban location and this source and its spatial influence have been quantified. IFN deposition with atmospheric precipitations is up to 5% of its background content in the upper 10 m layer of water at the north-western shelf of the Black Sea. Considering Redfield C:N ratio (106:16) and the rate of primary production (PP) in coastal areas of the Black Sea of about 100-130 g C m-2 year-1 we have assessed that average atmospheric IFN depositions may intensify primary production by 4.5% for rural locations, but this value is increased many-fold in urban locations due to local IFN sources.

Concerning the Heterogeneity of the Natural Abundance of 15N in Soil Nitrogen

1981 ◽  
Vol 45 (2) ◽  
pp. 450-451 ◽  
Author(s):  
Daniel H. Kohl ◽  
Barbara A. Bryan ◽  
Georgia Shearer ◽  
Ross A. Virginia
Keyword(s):  
Soil Nitrogen ◽  
Natural Abundance
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