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Range Management and Agroforestry
Year : 2020, Volume : 41, Issue : 2
First page : ( 258) Last page : ( 266)
Print ISSN : 0971-2070. Online ISSN : 2249-5231.

Comparative study of soil aggregation, carbon and microbial dynamics under agro-forestry, grasslands, orchard and cultivated land use systems

Paramanik Bappa1, Deb Shovik2,*, Choudhury Ashok2, Chakraborty Somsubhra3, Panda Parimal2, Hoque Anarul2, Deb Dibyendu4

1Dakshin Dinajpur KVK, Uttar Banga Krishi Viswavidyalaya, Majhian-733133, India

2Uttar Banga Krishi Viswavidyalaya, Pundibari-736165, India

3Indian Institute of Technology, Kharagpur-721302, India

4ICAR-Indian Grassland and Fodder Research Institute, Jhansi-284003, India

*Corresponding author shovik@ubkv.ac.in

Online published on 18 February, 2021.

Abstract

Land use has a profound impact on soil aggregate stability, carbon (C) sequestration and soil microbial activities. This study tried to explore the dynamics of soil C pools, aggregation, aggregate occluded C, microbial biomass and enzymatic activities within soil aggregates under four types of land uses viz. cultivated land, orchard, social/agro-forestry and grasslands. Outcomes indicated the maximum presence of total C in undisturbed soils of natural ecosystems like social/agro-forestry system (6.35 g kg−1), followed by orchard (4.05 g kg−1), grassland (4.03 g kg−1) and cultivated lands (3.07 g kg−1). Nevertheless, the proportion of water extractable C (WEC) + hot water extractable C (HWEC) per unit total C in soil was highest in tilled arable lands (0.128) and orchard (0.113) followed by social/agro-forestry (0.104) and grasslands (0.048). Although, land use showed no significant impact on soil microaggregates, macroaggregate quantity followed the order: social/agro-forestry (523.8 g kg−1 of total aggregate amount)> grassland (469.9 g kg−1)> orchard (454.1 g kg−1)> cultivated lands (332.7 g kg−1). Macroaggregate associated C was also found highest in soils of social/agro-forestry (61.5 g C kg 1 of macroaggregate), followed by grasslands (50.8 g kg 1), orchard (49.5 g kg−1) and cultivated lands (37.1 g kg−1). Analysis of microbial biomass C, present within the water stable aggregates, showed the same trend of macroaggregate quantity with land use change, while it was not so for the soil enzymatic activities. Analysis of both the dehydrogenase and β-glucosidase enzymes showed their presence in the following order: cultivated soils> orchard> social/agroforestry>grasslands. It was postulated that these enzymatic activities were controlled by the proportionate presence of labile C (WEC and HWEC) in soils.

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Keywords

Aggregate occluded C, Enzymatic activities, Land use, Microbial biomass C, Soil aggregates.

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