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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

DSpice at Indian Institute of Spices Research

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Field Value
 
Creator SRINIVASAN, V
MAHESWARAPPA, H P
LAL, R
 
Date 2013-01-25T22:06:22Z
2013-01-25T22:06:22Z
2012
 
Identifier Soil & Tillage Research 121:10- 17 (2012)
01671987
http://hdl.handle.net/123456789/872
 
Description Topsoil removal to incremental depths (TSD) under field conditions is a useful technique to simulate erosion, and assess its o~-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 o~-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 ofTSD treatments
(removal of 20 em 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 (BO)(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) (7.0gkg-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 ofPOC (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) ofPOC and PON in eroded
treatments indicated the buildup of un com pie xed 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.
 
Format 1110770 bytes
application/pdf
 
Language en
 
Subject Simulated erosion
Amendments
Aggregate stability
Aggregate associated carbon
Stratification ratio
 
Title Long term effects of topsoil depth and amendments on particulate and non particulate carbon fractions in a Miamian soil of Central Ohio
 
Type Article