Distribution of light and heavy fractions of soil organic carbon as related to land use and tillage practice

Tan, Zhengxi; Lal, Rattan; Owens, L. B.; Izaurralde, R. C.

doi:10.1016/j.still.2006.01.003

Cited by 212 publications

(141 citation statements)

References 32 publications

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“…Carbon concentration in heavy fraction average 20, 10, 8g kg -1 under no tillage, forest and conventional tillage land use system respectively (Tan et al, 2007). Carbon heavy fraction represented highest fraction in soil and corresponded to 82% of total organic carbon (TOC) at depth of 0-20 cm and arable land site tended to present the lowest value of heavy fraction carbon (HFC) at 0-10 cm depth (7.2 Mg ha -1 ) as compared to silvopasture system (Matos et al, 2011).…”

Section: -65mentioning

confidence: 98%

“…An increase in SOC levels is directly linked to the amount and quantity of organic residues return to the soils (Mandal et al, 2007). After each change in the land use system a new quasi-equilibrium stage is arrived over a period of constant management in terms of new land use pattern, vegetation cover and management practices (Bhattacharyya et al, 2008).The dynamics of SOC with change in land use and management can better be explained by the way C is allocated in different fractions of soil organic matter (Tan et al, 2007).…”

Section: Soil Organic Carbonmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Cultivation on Organic Carbon Pools and Nutrient Availability in Soil under Different Land Use System: A Review

Kaushik¹,

Raj²,

Rani³

et al. 2018

Int.J.Curr.Microbiol.App.Sci

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Section: -65mentioning

confidence: 98%

Section: Soil Organic Carbonmentioning

confidence: 99%

Effect of Cultivation on Organic Carbon Pools and Nutrient Availability in Soil under Different Land Use System: A Review

Kaushik¹,

Raj²,

Rani³

et al. 2018

Int.J.Curr.Microbiol.App.Sci

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“…In other tropical farming systems outside Africa, reduced tillage has been adopted. This practice increases Particulate Organic Matter (POM), as a result of slow decomposition of crop residues (Tan, Lal, Owens, & Izaurralde, 2007). Several workers like Christensen (2001) have observed that POM is higher in undisturbed soil than in the long-cultivated cropland soils.…”

Section: Improved Environmental Qualitymentioning

confidence: 99%

Soil Organic Carbon Thresholds and Nitrogen Management in Tropical Agroecosystems: Concepts and Prospects

Mazellier¹,

Tenywa²,

Ebanyat³

et al. 2013

JSD

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Soil organic carbon (SOC) is a potential soil fertility indicator for regulating nitrogen application in tropical farming systems. However, there are limited studies that have discussed SOC thresholds above or below which crop production could be diminished, or at which no or high response to nitrogen (N) application can be realized. This review explores the drivers of SOC concentration relevant for the establishment of thresholds. We further evaluate existing SOC thresholds for provoking no yield response or significant response to added N fertilizer. Key drivers for SOC concentration relevant in establishing thresholds are mainly climate, topography, texture, and land use management. Soil organic carbon threshold for sustaining soil quality is widely suggested to be about 2% below which deterioration may occur. For added N fertilizer management, specific SOC thresholds seem quite complex and are only valid after assuming other factors are non-limiting. In some soils, SOC levels as low as 0.5% result in fertilizer responses and soils as high as 2% SOC also respond to small N doses. Minimum SOC thresholds can be identified for a given soil type, but maximum thresholds depend on crop N requirements, crop N use efficiency and amount of N applied. However, there seem to exist critical total SOC ranges that could be targeted for optimal indigenous N supply and integrative soil functional benefits. These can be targeted as minimum levels in soil fertility restoration. In all, it is still difficult to establish a single minimum or maximum SOC threshold value that can be universally or regionally accepted.

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“…The fractionation was conducted with a modification according to the wet-sieving procedure suggested by Elliott (1986) and Tan et al (2007). In brief, 200 g samples of air-dried bulk soil (passing a 2 mm sieve) was placed on the top of a set of nested sieves (250, 53 µm).…”

Section: Fractionation Of Light Fraction and Water Stable Aggregatesmentioning

confidence: 99%

Using light fraction and macroaggregate associated organic matters as early indicators for management-induced changes in soil chemical and biological properties in adjacent native and plantation forests of subtropical Australia

Chen

et al. 2008

Geoderma

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Land use and management Forest Soil chemical and biological processes Soil physical structure causes differential accessibility of soil organic matter (SOM), including carbon (C) and nitrogen (N) pools, to decomposer organisms and is an important determinant of SOM storage. Physical fractionation method of SOM in conjunction with elemental as well as isotopic analyses (C, N, δ 13 C, δ 15 N) of those soil fractions are used in this study to determine the land use and management-induced changes of SOM and associated processes in three adjacent sites of native forest (NF), first (1R) and second rotation (2R, including tree planting row (2R-T) and windrow of harvest residues (2R-W)) of hoop pine plantations in southeast Queensland, Australia. The results suggest that there is a greater accumulation of C and N in the light fraction (LF) of NF site than that of plantation sites (1R and 2R), and the C and N losses following conversion from mixed species NF to the single-species plantation are attributed to the reduction in C and N stocks for all physical fractions separated by wet sieving. In contrast, the C and N losses induced by the rotation practices (e.g., between 1R and 2R-T) are attributed to the C and N decreases in the LF and macroaggregates (250-2000 µm) only. The C and N increases upon the residue management (e.g., between 2R-W and 2R-T) are primarily attributed to the C and N increases in the LF and macroaggregates as well. Coupled with 30 soil chemical and biological parameters obtained in our previous studies, further principal component and multivariable regression analyses were conducted and the results showed that both the LF and macroaggregates were highly related to the status of C and N pools, the processes of N transformation and soil respiration, and the diversity of microbial communities, and thus could serve as diagnostic SOM fractions responsible for the changes of soil properties and processes within the tested ecosystem induced by the land uses and management practices. Knowledge of the interactive relationships between aggregate classes within SOM and soil chemical and biological processes in this study represents a further step towards diagnostically measuring and understanding important soil C and N processes in response to the land use and management changes in the soil ecosystems such as forests in subtropical Australia.

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Distribution of light and heavy fractions of soil organic carbon as related to land use and tillage practice

Cited by 212 publications

References 32 publications

Effect of Cultivation on Organic Carbon Pools and Nutrient Availability in Soil under Different Land Use System: A Review

Effect of Cultivation on Organic Carbon Pools and Nutrient Availability in Soil under Different Land Use System: A Review

Soil Organic Carbon Thresholds and Nitrogen Management in Tropical Agroecosystems: Concepts and Prospects

Using light fraction and macroaggregate associated organic matters as early indicators for management-induced changes in soil chemical and biological properties in adjacent native and plantation forests of subtropical Australia

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