Vol. 6, Issue 5 (2018)
Molecular turnover time in restoration of labile organic carbon and enzyme activities due to minimal soil disturbance and increased residue retention in subtropical India: A review
Author(s): RK Naresh, Mukesh Kumar, PC Ghasal, Saurabh Tyagi, NC Mahajan, Lali Jat, Meenakshi, MP Gautam and SS Tomar
Abstract: The formation of aggregates plays a key role in shaping soil microenvironment, which in turn influences microbial community structure and organic carbon (C) dynamics in soil. Carbon in large macro-aggregates (>2 mm), small macro-aggregates (0.25–2 mm), and free organic matter (>0.053 mm) was significantly positively correlated with C, lignin, and polyphenols. Carbon in micro-aggregates and fine particles (<0.053 mm) was significantly negatively correlated with C: N ratio. The P. australis had the highest annual average activity of alkaline phosphomonoesterase, and the S. alterni flora had the highest annual average activities of β-glycosidase and invertase. However, the conventional tillage had the lowest activities of alkaline phosphomonoesterase, β-glycosidase, and invertase. Analysis also showed that the soil labile organic carbon fractions and soil enzyme activities had distinct seasonal dynamics. In addition, the soil MBC content was significantly correlated with the activities of urease and β-glucosidase. The DOC content was significantly correlated with the activities of urease, alkaline phosphomonoesterase, and invertase. The degree of soil disturbance and the use of crop residues influence the availability of organic compounds and minerals for the soil biota. This conglomerate of elements can affect population, diversity and activity of the different soil organisms. Besides, soil communities also have an impact on soil physical and chemical conditions. From macro-fauna to micro-fauna, all parts interact and therefore play a role in nutrient cycling and organic matter decomposition. The mixing of residues/surface retention into the soil increases SOM mineralisation due to greater exposure to microbial decomposers and optimal moisture and temperature regimes. Soil disturbance by tillage leads to destruction of the protective soil aggregate. This in turn exposes the labile C occluded in these aggregates to microbial breakdown.
Pages: 1309-1329 | 537 Views 127 Downloads
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How to cite this article:
RK Naresh, Mukesh Kumar, PC Ghasal, Saurabh Tyagi, NC Mahajan, Lali Jat, Meenakshi, MP Gautam, SS Tomar. Molecular turnover time in restoration of labile organic carbon and enzyme activities due to minimal soil disturbance and increased residue retention in subtropical India: A review. Int J Chem Stud 2018;6(5):1309-1329.
