Soil organic carbon characterization in a tropical ecosystem under different land uses using proximal soil sensing technique

Soil organic carbon (SOC) sequestration in aggregates under land use change have been widely concerned due to intimate impacts on the sink (or source) of atmospheric carbon dioxide (CO2). However, the quantitative relationship between soil aggregation and SOC sequestration under land uses change has been poorly studied. Distribution of aggregates, SOC contents in bulk soils and different size aggregates and their contributions to SOC sequestration were determined under different land uses in the Puding Karst Ecosystem Observation and Research Station, karst Critical Zone Observatory (CZO), Southwest China. Soil aggregation and SOC sequestration increased in the processes of farmland abandonment and recovery. SOC contents in micro-aggregates were larger than those in macro-aggregates in restored land soils, while the opposite results in farmland soils were obtained, probably due to the hindrance of the C-enriched SOC transport from macro-aggregate into micro-aggregate by the disturbance of agricultural activities. SOC contents in macro-aggregates exponentially increased with their proportions along successional land uses. Macro-aggregates accounted for over 80% on the SOC sequestration in restored land soils, while they accounted for 31–60% in farmland soils. These results indicated that macro-aggregates have a great potential for SOC sequestration in karst soils.

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The chemical and physical stability soil organic carbon in the top 1 m of the soil profile under different land uses in the UK

10.5194/egusphere-egu2020-514 ◽

2020 ◽

Author(s):

Dedy Antony ◽

Jo Clark ◽

Chris Collins ◽

Tom Sizmur

Keyword(s):

Land Use ◽

Organic Matter ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Soil Profile ◽

Soil Depth ◽

Physical Stability ◽

Silty Clay ◽

Land Uses ◽

Total N

Soils are the largest terrestrial pool of organic carbon and it is now known that as much as 50% of soil organic carbon (SOC) can be stored below 30 cm. Therefore, knowledge of the mechanisms by which soil organic carbon is stabilised at depth and how land use affects this is important.This study aimed to characterise topsoil and subsoil SOC and other soil properties under different land uses to determine the SOC stabilisation mechanisms and the degree to which SOC is vulnerable to decomposition. Samples were collected under three different land uses: arable, grassland and deciduous woodland on a silty-clay loam soil and analysed for TOC, pH, C/N ratio and texture down the first one metre of the soil profile. Soil organic matter (SOM) physical fractionation and the extent of fresh mineral surfaces were also analysed to elucidate SOM stabilisation processes.Results showed that soil texture was similar among land uses and tended to become more fine down the soil profile, but pH did not significantly change with soil depth. Total C, total N and C/N ratio decreased down the soil profile and were affected by land use in the order woodland > grassland > arable. SOM fractionation revealed that the free particulate organic matter (fPOM) fraction was significantly greater in both the topsoil and subsoil under woodland than under grassland or arable. The mineral associated OC (MinOC) fraction was proportionally greater in the subsoil compared to topsoil under all land uses: arable > grassland > woodland. Clay, Fe and Mn availability play a significant role (R2=0.87) in organic carbon storage in the top 1 m of the soil profile.It is evidently clear from the findings that land use change has a significant effect on the dynamics of the SOC pool at depth, related to litter inputs to the system.

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Depth distribution of soil organic carbon in an Oxisol under different land uses: Stratification indices and multifractal analysis

Geoderma ◽

10.1016/j.geoderma.2016.09.021 ◽

2017 ◽

Vol 287 ◽

pp. 126-134 ◽

Cited By ~ 15

Author(s):

Mara A. Marinho ◽

Michender W.M. Pereira ◽

Eva Vidal Vázquez ◽

Marcos Lado ◽

Antonio Paz González

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Multifractal Analysis ◽

Depth Distribution ◽

Land Uses

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Association of soil organic carbon with physically separated soil fractions in different land uses of Costa Rica

Acta Agriculturae Scandinavica Section B - Soil & Plant Science ◽

10.1080/09064710.2015.1020859 ◽

2015 ◽

Vol 65 (5) ◽

pp. 448-459

Author(s):

Paula Chacón ◽

Klaus Lorenz ◽

Rattan Lal ◽

Frank G. Calhoun ◽

Norman R. Fausey

Keyword(s):

Costa Rica ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Land Uses ◽

Soil Fractions

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Soil organic carbon mineralization rates in aggregates under contrasting land uses

Geoderma ◽

10.1016/j.geoderma.2013.10.023 ◽

2014 ◽

Vol 216 ◽

pp. 10-18 ◽

Cited By ~ 59

Author(s):

S.M. Fazle Rabbi ◽

Brian R. Wilson ◽

Peter V. Lockwood ◽

Heiko Daniel ◽

Iain M. Young

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Carbon Mineralization ◽

Land Uses ◽

Soil Organic Carbon Mineralization ◽

Organic Carbon Mineralization

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Land quality and soil organic carbon stocks consequent to land use change from natural forest to coffee plantation in a hot humid tropical ecosystem of Western Ghats, South India: Is it restorative enough?

Authorea ◽

10.22541/au.158221338.81133611 ◽

2020 ◽

Author(s):

Karthika K S ◽

K S Anil Kumar ◽

Nair K M ◽

Maria Violet D Souza ◽

Nagaraj J S ◽

...

Keyword(s):

Land Use ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Western Ghats ◽

South India ◽

Carbon Stocks ◽

Coffee Plantation ◽

Tropical Ecosystem ◽

Land Quality ◽

Soil Organic Carbon Stocks

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Soil organic carbon assessment under different land uses in Cauvery delta zone of Tamil Nadu, India

Journal of Applied and Natural Science ◽

10.31018/jans.v12i4.2372 ◽

2020 ◽

Vol 12 (4) ◽

pp. 478-483

Author(s):

Surya Prabha A.C. ◽

Velumani R. ◽

Senthivelu M. ◽

Arulmani K. ◽

Pragadeesh S.

Keyword(s):

Land Use ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Tamil Nadu ◽

Soil Samples ◽

Land Uses ◽

Forest Land ◽

Size Fractions ◽

Soc Stock ◽

Cauvery Delta

Soil organic carbon (SOC) plays a vital role in soil fertility and is important for its contributions to mitigation and adaptation to climate change. The present study was undertaken to estimate the SOC stock in soils under different land uses of Cauvery Delta zone of Tamil Nadu. Four different land uses were selected for the study viz, Forests, Agriculture, Agro-forestry and Plantations. Soil samples were collected from Madukkur and Kalathur soil series of Cauvery Delta zone for soil carbon analysis. The soil samples were fractionated into three aggregate size classes viz., macro-aggregates (250-2000µm), micro-aggregates (53-250 µm) and silt and clay sized fraction (<53 µm). At 0-30 cm depth, the forest land use stored the maximum SOC stock in the different size fractions viz. macro-sized fraction (73.0 Mg ha-1), a micro-sized fraction (76.0 Mg ha-1) and silt+clay sized fraction (77.0 Mg ha-1) in Madukkur series. Agriculture land use registered the lowest SOC stock. Among the different size fractions, silt+clay sized fraction (< 53 µm) retained the maximum SOC in all the land uses. In Kalathur series also, maximum soil organic carbon stock was recorded in forest land use. The data generated in the study will be beneficial to the user groups viz., farmers in identifying the most suitable land use for enhancing the storage of soil organic carbon thereby improving yields of crops and trees.

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