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Long term effects of topsoil depth and amendments on particulate and non particulate carbon fractions in a Miamian soil of Central Ohio

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Title Long term effects of topsoil depth and amendments on particulate and non particulate carbon fractions in a Miamian soil of Central Ohio
Not Available
 
Creator V. Srinivasan, H.P. Maheswarappa, R. Lal
 
Subject Simulated erosion, Amendments, Aggregate stability, Aggregate associated carbon, Stratification ratio
 
Description Not Available
Topsoil removal to incremental depths (TSD) under field conditions is a useful technique to simulate
erosion, and assess its on-site impacts on soil properties and agronomic productivity. As the sustained
productivity of the soils of US Cornbelt is threatened by topsoil loss due to erosion, the artificial soil
removal and addition methods can help in assessing the on-site impact of soil erosion under natural field
conditions. Thus this study was conducted in an Alfisol at Waterman Farm of The Ohio State University,
Columbus, Ohio with the objective to assess the impact of long-term (13 years) effects of TSD treatments
(removal of 20 cm topsoil, undisturbed soil and addition of 20 cm of top soil) with two amendments
(organic manures and synthetic fertilizer) on particulate C fractions, and C associated with different size
fractions. Application of organic or inorganic amendments to the eroded soil improved bulk density (BD)
(1.57 Mg m3), water stable aggregates (WSA) (87%) and mean weight diameter (MWD) (3.18 mm)
equivalent to undisturbed or soil addition treatments. However, the eroded soil had significantly lower
total organic carbon (TOC) concentration (16.3 g kg 1) compared to other treatments. A trend of higher
TOC and nitrogen (TON) concentration was observed with manuring compared with the use of synthetic
fertilizer. The lowest concentration (2.66 g kg 1) of particulate organic carbon (POC) was measured in
eroded soil, and it was 2.6 and 2.4 times lower than those of undisturbed and soil addition treatments,
respectively. The sub-soil (15–30 cm) accumulated significantly lower POC (3.6 g kg 1) compared to the
topsoil (0–15 cm) (7.0 g kg 1), with no difference among two amendments. The POC and N pools were
also significantly lower in the eroded soil than in other treatments. The particulate organic C/N ratio was
significantly larger in sub-soil (20.78) than surface soil (17.83), suggesting strong contribution of roots
and root-derived products to POC. There was a positive correlation of macroaggregates C (>2 mm and
0.25–2 mm) with concentration of POC (0.58 * , 0.41 * ) and PON (0.54 * * , 0.37 * ). The non particulate organic
carbon (NPOC) pools increased with long term management, and were significantly correlated
(R2 = 0.74 * * ) with the TOC concentration. Higher stratification ratio for total and non particulate C and N
was observed in undisturbed and soil addition treatments. Higher ratios (>2) of POC and PON in eroded
treatments indicated the buildup of uncomplexed coarse organic residues of intermediate decomposition
with higher turnover rate, and their positive impact on restoring the structural properties with the longterm
use of amendments.
Not Available
 
Date 2024-04-12T14:38:48Z
2024-04-12T14:38:48Z
2012-01-22
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/82004
 
Language English
 
Relation Not Available;
 
Publisher Elsevier