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Soil Carbon Pools, Mineralization and Fluxes Associated with Land Use Change in Vertisols of Central India

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Title Soil Carbon Pools, Mineralization and Fluxes Associated with Land Use Change in Vertisols of Central India
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Creator Pramod Jha • Arpan De • Brij Lal Lakaria • A. K. Biswas • M. Singh • K. S. Reddy • A. S. Rao
 
Subject Soil carbon pools Land use Carbon mineralization Vertisols Central India
 
Description Not Available
Land use affects soil carbon dynamics which
influence the global carbon cycle. Understanding the
response of soil organic carbon (SOC) dynamics to landuse
changes require size and mean residence time (MRT)
of measurable SOC pools. We measured soil carbon pool
sizes and decay constants of active and slow carbon pools
for different land use systems (agriculture, forest and horticulture)
of Central India. Long-term incubation study was
carried out for quantification of active (Ca) and slow (Cs)
carbon pools and MRT. Chemical fractionation technique
(acid hydrolysis) was used for quantification of resistant
carbon pool (Cr). The non-hydrolysable carbon (Cr)
expressed as a percentage of total C varied between 65 and
68 % in the surface soil of different land use system
whereas it was 78 % in sub-surface soil. The incubation
study revealed that the Ca pool in different land use system
ranged between 3.3 and 10 % of the total C and MRT
varied from 25 to 67 days with an average value of
46 days. Our results demonstrate that the active SOC is a
sensitive indicator for changes in SOC following land use
change. MRT of a slow carbon pool of forest land use was
38.5 years. The MRT of slow pool C in the upper soil layer
(0–15 cm) did not differ between horticulture and agriculture
land use systems and was approximately 4.5 years.
In agriculture land use, MRT of a slow pool of C under was
only 2.3 years in sub surface plot. However, MRT of slow
carbon pool (Cs) under the Farm yard manure (organic
plot) increased by fourfold (17.5 years) in comparison to
inorganic treatment (recommended dose of fertilizer-RDF)
plot. The results clearly depict opportunity of soil carbon
buildup in agriculture with good management practices
(application of organic manure). The present research work
will also help in improving the SOC dynamics predictive
capacity of different global bio-geochemical carbon
models.
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Date 2020-05-15T14:32:09Z
2020-05-15T14:32:09Z
2012-11-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/35672
 
Language English
 
Relation Not Available;
 
Publisher Not Available