Record Details

Soil Erodibility, Aggregate And Organic Carbon Dynamics Under Different Land Use Systems In Submontane Jammu

KrishiKosh

View Archive Info
 
 
Field Value
 
Title Soil Erodibility, Aggregate And Organic Carbon Dynamics Under Different Land Use Systems In Submontane Jammu
 
Creator Kumar, Vijay
 
Contributor Sharma, K. R.
 
Subject You have exceeded your usage quota. Please contact gshukla [at] iitk.ac.in
SOC POOLS
You have exceeded your usage quota. Please contact gshukla [at] iitk.ac.in
SOIL AGGREGATION
You have exceeded your usage quota. Please contact gshukla [at] iitk.ac.in
ERODIBILITY INDICES
You have exceeded your usage quota. Please contact gshukla [at] iitk.ac.in
SUBMONTANE
 
Description Dynamics of soil aggregation and SOC and its quality are strongly influenced by land use pattern, soil erosion and land degradation. An investigation was carried out to study soil erodibility, aggregation, organic carbon stocks and organic carbon pools in different size fractions of soil aggregates and relationship among soil properties and erodibility indices as well as soil C under different land use systems. The soil organic carbon (SOC) its pools viz hot water soluble carbon (HWSC), particulate organic carbon (POC), aggregated associated organic carbon (AAOC) and Total carbon (TC) were determined for bulk soils down the profile upto 100 cm at each landuse site. The stocks of SOC and its pools in 100 cm profile were determined under different landuses. Soil aggregates from different landuses were categorized as dry stable and wet stable using appropriate techniques. SOC along with its pools were analyzed in both dry and wet stable aggregates. Macro aggregates (>2 mm) were abundant (52.52-91.13%) in pasture soils while microaggregates (2 mm (water stable aggregates >2 mm) dry and wet was highest in pasture (91.13%) and lowest (42.53 %) in degraded lands. The soil organic carbon (SOC) and its pools showed a decline with soil depth where as TC in degraded soils were found to increase with soil depth. The soil organic carbon (SOC) stock in 0-100 cm depth was highest in forest land (53.38 Mg ha-1) and lowest in agriculture (42.09 Mg ha-1). Aggregates from pasture soils had highest concentration of SOC in the surface (0-15 cm) soils whereas in sub-surface (15-30 cm) soils the aggregates from forest soils had highest amount of SOC. Pools of SOC in the aggregates also followed similar trends. Soil erodibility indices viz. Suspension percentage (SP), Clay ratio (CR), Modified Clay ratio (MCR), Dispersion ratio (DR), Suspension ratio (SR) and Erosion index (EI) were computed and compared. Considering 15 and 2.8 a threshold limit of DR and EI between erodible and non erodible soils, the soils under all the landuses were observed to be erodible in nature. On the basis of susceptibility to erodibility, the landuse systems could be arranged in the order of their erodibility status as: degraded lands >agriculture > pasture > horticulture > forest lands. The bulk density and silt content had positive and significant correlation with SP, CR, MCR, DR, SR and EI. The available macronutrients (N, P, K and S), and physical properties (porosity, maximum water holding and sand) were negatively significantly correlated with SP, CR, MCR, DR, SR and EI. The SOC had highly significant and positive correlation with POC (r= 0.999**), HWC (r = 0.998**), AAOC (0.987**) and TC (r = 0.938*) forms.
 
Date 2016-09-08T15:40:13Z
2016-09-08T15:40:13Z
2016-08-16
 
Type Thesis
 
Identifier J-11-D-139-A
http://krishikosh.egranth.ac.in/handle/1/76137
 
Language en
 
Format application/pdf
 
Publisher Divison of Soil Science and Agricultural Chemistry, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu