Contribution of glomalin to dissolve organic carbon under different land uses and seasonality in dry tropics.
Glomalin related soil protein (GRSP) is a hydrophobic glycoprotein that is significant for soil organic carbon (SOC) persistence and sequestration, owing to its large contribution to SOC pool and long turnover time. However, the contribution of GRSP to dissolve OC (DOC) leach from soil is not yet comprehensively explored, though it could have implication in understanding SOC dynamics. We, therefore, aim to measure the contribution of GRSP to DOC, in a range of land uses and climatic seasons in the dry tropical ecosystem. Our results demonstrated that a significant proportion of GRSP (water soluble GRSP; WS-GRSP) leached with DOC (7.9-21.9 mg kg-1), which accounts for 0.2-0.23% of soils total GRSP (T-GRSP). Forest exhibited significantly higher WS-GRSP and DOC leaching than fallow and agriculture. WS-GRSP and DOC accumulations were higher in the dry season (summer and winter) than in rainy. The extent of seasonal variations was higher in forest than in other two land uses, indicating the role of vegetation and biological activity in soil dissolve organic matter (DOM) dynamics. The regression analysis among WS-GRSP, T-GRSP, DOC and SOC prove that the accumulations and leaching of GRSP and other soil OM (SOM) depend on similar factors. The ratio of WS-GRSP-C to DOC was higher in agriculture soil than in forest and fallow, likely a consequence of altered soil chemistry, and organic matter quantity and quality due to soil management practices. Multivariate analysis reflects a strong linkage among GRSP and SOC storage and leaching, soil nutrients (nitrogen and phosphorus) and other important soil properties (pH and bulk density), suggesting that improving GRSP and other SOM status is an urgent need for the both SOC sequestration and soil health in dry tropical agro-ecosystems.
Academy of Scientific and Innovative Research (AcSIR), CSIR-National Botanical Research Institute (CSIR-NBRI) Campus, Rana Pratap Marg, Lucknow, 226001, India; Plant Ecology and Environmental Science Division, CSIR-National Botanical Research Institute, Lucknow, 226001, India. Electronic address: ashutosh.evst11@gmail.com.
Ashutosh Kumar
AK
Singh
Plant Ecology and Environmental Science Division, CSIR-National Botanical Research Institute, Lucknow, 226001, India; Department of Botany, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India.
Apurva
A
Rai
Academy of Scientific and Innovative Research (AcSIR), CSIR-National Botanical Research Institute (CSIR-NBRI) Campus, Rana Pratap Marg, Lucknow, 226001, India; Plant Ecology and Environmental Science Division, CSIR-National Botanical Research Institute, Lucknow, 226001, India.
Vivek
V
Pandey
Academy of Scientific and Innovative Research (AcSIR), CSIR-National Botanical Research Institute (CSIR-NBRI) Campus, Rana Pratap Marg, Lucknow, 226001, India; Plant Ecology and Environmental Science Division, CSIR-National Botanical Research Institute, Lucknow, 226001, India. Electronic address: nanditasingh8@yahoo.co.in.
Nandita
N
Singh
D000383:Agriculture; D002244:Carbon / Q000032:analysis*; D057965:Carbon Sequestration; D002980:Climate; D017753:Ecosystem; D065928:Forests; D005656:Fungal Proteins / Q000032:analysis*; D006023:Glycoproteins / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D012987:Soil / Q000737:chemistry
D005656:Fungal Proteins; D006023:Glycoproteins; D012987:Soil; C573268:glomalin; D010758:Phosphorus; D002244:Carbon; D009584:Nitrogen
Glomalin related soil protein; Land use system; Seasonal variation; Soil organic carbon; Tropical dry forest; Water soluble organic carbon