The influence of soil texture and aggregation on carbon and nitrogen dynamics in southwest Oregon forests and clearcuts

1992 ◽  
Vol 22 (3) ◽  
pp. 298-305 ◽  
Author(s):  
Jeffrey G. Borchers ◽  
David A. Perry
Keyword(s):  
Particle Size ◽  
Soil Texture ◽  
Release Mechanism ◽  
Silt Loam ◽  
Available N ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
Clear Cutting ◽  
C And N ◽  
Southwest Oregon

Soil texture and aggregation on two old, poorly vegetated clearcuts and adjacent forests in southwest Oregon were investigated for their influence on loss of soil carbon (C) and nitrogen (N) in disturbed ecosystems with different soil parent material and texture. We determined C and N concentrations in five particle size fractions to detect changes in the more labile components of soil organic matter. The extent to which the labile components were protected from microbial degradation was tested by estimating increases in N availability (anaerobic incubation) after soil aggregates were sonically disrupted. In comparisons of silt loam and sandy loam soils, the coarser soil had lower total C and N concentrations, lower levels of available N in sonically disrupted soil, and significantly greater decreases in available N associated with clear-cutting; nevertheless, C and N losses from the clearcut with fine-textured soil may have been greater, as shown by lower C and N concentrations in silt and clay particle size fractions. The silt loam soil appeared to have a larger pool of physically protected, labile N, which acts as a "slow-release" mechanism that sustains available N at preharvest levels.

Potential for using soil particle-size data to infer geological parent material in the Sydney Region

Soil Research ◽  
2013 ◽  
Vol 51 (4) ◽  
pp. 301 ◽  
Author(s):  
Margaret R. Donald ◽  
Pamela A. Hazelton ◽  
AnneMarie Clements
Keyword(s):  
Particle Size ◽  
Soil Sample ◽  
Soil Texture ◽  
Compositional Data ◽  
Size Fraction ◽  
Parent Material ◽  
Ecological Communities ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
Statistical Classifiers

Ecological communities are more than assemblages of species. In assessing the presence of many ecological communities, interpretation of soil properties and associated parent material has become a definitive component under environmental legislation worldwide, and particularly in Australia. The hypothesis tested here is that the geological parent material of a soil sample can be determined from particle size fraction data of the Marshall soil texture diagram. Supervised statistical classifiers were built from data for four particle-size fractions from four soil landscape publications. These methods were modified by taking into account possible autocorrelation between samples from the same site. The soil samples could not be classified with certainty as being derived from Wianamatta Group Shale or Hawkesbury Sandstone parent material. The classification of alluvial/fluvial-derived soils was no better than chance alone. A good classifier using four-fraction compositional data could not be built to determine geological parent material. Hence, the three size fractions of the Marshall soil texture diagram are insufficient to determine the geological parent material of a soil sample.

The effects of agronomy on C and N distribution in soil organo-mineral fractions

1982 ◽  
Vol 98 (2) ◽  
pp. 335-342 ◽  
Author(s):  
T. McM. Adams
Keyword(s):  
Particle Size ◽  
Soil Water ◽  
Ultrasonic Treatment ◽  
Size Range ◽  
Mineral Particle ◽  
Water Mixture ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
N Distribution ◽  
C And N

SUMMARYSoils from grass-arable cropping sequences and from an experiment where grassland had been treated with slurry were dispersed by shaking as a soil-water mixture, followed by ultrasonic treatment. Organo-mineral particle size fractions were separated by sieving and by sedimentation.Generally, concentration of C and N in the fractions decreased with increasing particle size. However, when expressed as weight of C per fraction maximum contents were in the 2–10 μm range. With N, maximum contents occurred about 2 μm. Largest differences in C and N contents between soils were found in the 0·2–20 μm size range.Identification of the source of the materials in the various fractions was attempted by interpretation of the C/N ratios, but was generally inconclusive.

Influence of animal slurries composition and relative particle size fractions on the C and N mineralization following soil incorporation

2012 ◽  
Vol 47 ◽  
pp. 50-61 ◽  
Author(s):  
David Fangueiro ◽  
Henrique M. Ribeiro ◽  
Ernesto Vasconcelos ◽  
João Coutinho ◽  
Fernanda Cabral
Keyword(s):  
Particle Size ◽  
N Mineralization ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
C And N Mineralization ◽  
C And N

scholarly journals Carbon and nitrogen contents in particle–size fractions of topsoil along a 3000 km aridity gradient in grasslands of northern China

2016 ◽  
Vol 13 (12) ◽  
pp. 3635-3646 ◽  
Author(s):  
Xiao-Guang Wang ◽  
Seeta A. Sistla ◽  
Xiao-Bo Wang ◽  
Xiao-Tao Lü ◽  
Xing-Guo Han
Keyword(s):  
Particle Size ◽  
Northern China ◽  
Soil Particle ◽  
Sand Content ◽  
Soil C ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
Soil Particle Size ◽  
Soil C And N ◽  
C And N

Abstract. Climate factors such as aridity significantly influence soil carbon (C) and nitrogen (N) stocks in terrestrial ecosystems. Further, soil texture plays an important role in driving changes of soil C and N contents at regional scale. However, it remains uncertain whether such changes resulted from the variation of different soil particle–size factions and/or the C and N concentrations in those fractions. We examined the distribution of total C and N in both bulk soil and different soil particle–size fractions, including sand (53–2000 µm), silt (2–53 µm), and clay (< 2 µm), along a 3000 km transect in arid and semi-arid grasslands of northern China. Across the whole transect, sand content was positively and silt content was negatively correlated with increasing aridity. Carbon content in bulk soils (0–10 cm) ranged from 4.36 to 46.16 Mg C ha−1, while N content ranged from 0.22 to 4.28 Mg N ha−1 across different sampling sites on the transect. The total C and N concentrations and contents in bulk soils as well as in the three particle–size fractions tended to be negatively correlated with aridity. The concentrations and contents of total C and N in bulk soils were positively correlated with silt and clay contents and negatively correlated with sand content. Positive correlations were observed between the concentrations and contents of C or N in bulk soils and the C or N concentrations in the three soil particle–size fractions. By characterizing such a large scale aridity gradient, our results highlight that aridity would decrease soil C and N contents both by favoring increased sand content and by decreasing C and N concentrations in all the three soil fractions. These patterns thus have significant implications for understanding soil C and N sequestration under scenarios of increasing aridity in global drylands that are predicted to occur this century.

Distribution of C and N mineralization of a sludge compost within particle-size fractions

2010 ◽  
Vol 101 (4) ◽  
pp. 1254-1262 ◽  
Author(s):  
J. Doublet ◽  
C. Francou ◽  
J.P. Pétraud ◽  
M.F. Dignac ◽  
M. Poitrenaud ◽  
...  
Keyword(s):  
Particle Size ◽  
N Mineralization ◽  
Sludge Compost ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
C And N Mineralization ◽  
C And N

scholarly journals Carbon and nitrogen stocks in particle-size fractions of topsoil along a 3000 km aridity gradient in northern China

2016 ◽  
Author(s):  
X. G. Wang ◽  
S. A. Sistla ◽  
X. B. Wang ◽  
X. T. Lü ◽  
X. G. Han
Keyword(s):  
Particle Size ◽  
Northern China ◽  
Soil Particle ◽  
Sand Content ◽  
Soil C ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
Soil Particle Size ◽  
Soil C And N ◽  
C And N

Abstract. Climate factors such as aridity significantly influence soil carbon (C) and nitrogen (N) stocks in terrestrial ecosystems. Further, soil composition plays an important role in driving changes of soil C and N stocks at regional scale. However, it remains uncertain whether such changes result from the variation of different soil particle-size factions or the C and N concentrations in those fractions. We examined the distribution of total C and N in both bulk soil and different soil particle-size fractions, including sand (53-2000 μm), silt (2-53 μm) and clay (<2 μm), along a 3000 km transect in arid and semi-arid grasslands of northern China. Across the whole transect, sand content was positively and silt content was negatively correlated with increasing aridity. Carbon stock in bulk soils (0-10 cm) ranged from 4.36 to 46.16 Mg C ha-1, while N stock ranged from 0.22 to 4.28 Mg N ha-1 across different sampling sites on the transect. The total C and N concentrations and stocks in bulk soils as well as in the three particle-size fractions tended to be negatively correlated with aridity. The concentrations and stocks of total C and N in bulk soils were positively correlated with silt and clay contents and negatively correlated with sand content. There were positive correlations between the concentrations and stocks of C or N in bulk soils and the C or N concentrations in the three soil particle-size fractions. By characterizing such a large scale aridity gradient, our results highlight that aridity would decrease soil C and N stocks both by favoring increased sand content and by decreasing C and N concentrations in all the three soil fractions. These patterns thus have significant implications for understanding soil C and N sequestration under scenarios of increasing aridity in global drylands that are predicted to occur this century.

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