In search of the elusive “active” fraction of soil organic matter: Three size-density fractionation methods for tracing the fate of homogeneously 14C-labelled plant materials

Magid, Jakob; Gorissen, A.; Giller, Ken E.

doi:10.1016/0038-0717(95)00111-5

Cited by 115 publications

(66 citation statements)

References 28 publications

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“…Magid et al (1996) had also indicated that fractionation by size and density was a more powerful approach for separating soil organic matter fractions than fractionation by density alone. In our study, we arbitrarily define the coarse LF as having particle size 1 mm.…”

Section: Resultsmentioning

confidence: 99%

Carbon and nitrogen contents of different-sized light fraction organic matter as influenced by tillage and residue management

Soon¹,

Haq²,

Arshad³

2009

Can. J. Soil. Sci.

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. 2009. Carbon and nitrogen contents of different-sized light fraction organic matter as influenced by tillage and residue management. Can. J. Soil Sci. 89: 281Á286. The light fraction (LF) has a variable elemental content because it comprises a pool of soil organic matter that is in transition between fresh residues and stable, humified organic matter. Our aim was to assess the influence of time, tillage (CT vs. NT) and straw management (removed or retained) practices on the C and N contents of two particle sizes of LF materials from a Gray Luvisol in Alberta. The LF C and N concentrations were not affected by tillage and straw treatments. The C concentration was higher in LF 1 mm (coarse LF) than in the B1 mm LF (fine LF), while the converse was observed for N concentration, resulting in C:N ratios of 45Á59 in the coarse fraction and 18Á19 for the finer materials. The C concentration of the fine LF decreased and the N concentration increased with time. After 4 yr, LF C and N stocks were higher under NT than under CT mainly because of faster decomposition of litter under CT. Retaining straw resulted in bigger increases in C and N stocks in the coarse LF compared with straw removal; with the fine LF, the C stock decreased more quickly and the N stock increased less rapidly with straw removal. Our results show that time strongly affected the LF C and N stocks and concentrations, and that separating the fraction by size can lead to a more meaningful interpretation of those data.Key words: Light fraction, carbon, nitrogen, tillage, crop residue, straw management Soon, Y. K., Haq, A. et Arshad, M. A. 2009.Incidence du travail du sol et de la gestion des re´sidus agricoles sur la teneur en carbone et en azote de la fraction le´ge`re de matie`re organique selon sa granulome´trie. Can. J. Soil Sci. 89: 281Á286. La concentration d'e´le´ments mine´raux dans la fraction le´ge`re (FL) varie, car cette fraction se compose de matie`re organique en transition entre l'e´tat de re´sidus frais et stables, et celui d'humus. Les auteurs souhaitaient e´valuer l'influence du temps, du travail du sol (comparativement au non-travail du sol) et de la gestion de la paille (suppression ou pas) sur la teneur en C et en N de la FL pre´sente dans un Luvisol gris de l'Alberta selon sa granulome´trie. La concentration de C et de N dans la FL n'est pas affecte´e par le travail du sol ni la gestion de la paille. La FL de plus de 1 mm (fraction grossie`re) renferme plus de C que la FL de moins de 1 mm (fraction fine), mais l'inverse est vrai pour le N, ce qui de´bouche sur un ratio C:N de 45 a5 9 pour la fraction grossie`re et de 18Á19 pour les mate´riaux fins. La concentration de C dans la fraction fine diminue dans le temps, alors que celle de N augmente. Apre`s quatre ans, les re´serves de C et de N dans la FL sont plus importantes dans les sols non travaille´s que dans ceux travaille´s, principalement a`cause de la de´composition plus rapide des de´bris ve´ge´taux. Laisser la paille sur le terrain accroıˆt les stocks de C et de N davantage d...

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Section: Resultsmentioning

confidence: 99%

Carbon and nitrogen contents of different-sized light fraction organic matter as influenced by tillage and residue management

Soon¹,

Haq²,

Arshad³

2009

Can. J. Soil. Sci.

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“…The procedure is useful method for studying labile pools of SOC that are more sensitive to cropping practice than is the total SOC pool in temperate soils (Janzen et al 1992). Generally, sodium polytungstate (SPT) (1.85 g mL -1 ) and NaI (1.3 g cm -3 ) solutions are often used for density fractionation (Golchin et al 1994;Magid et al 1996;Six et al 2002). Although LF is commonly referred to a plant-like and less stable fraction with high OC concentration (Gregorich et al 2003), HF is more stable and high-density organo-mineral fractions having lower C concentrations (Golchin et al 1995a, b).…”

Section: Density Fractionationmentioning

confidence: 99%

Assessment of changes in different fractions of the organic carbon in a soil amended by nanozeolite and some plant residues: incubation study

Aminiyan

Sinegani

Sheklabadi

2015

Int J Recycl Org Waste Agricult

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Introduction Organic carbon (OC) fractions play important roles in soil and many ecosystem processes. This study focuses on changing of OC in density and soluble fractions in a soil amended by nanozeolite and plant residues that incubated in lab condition for 90 days.Results The results showed that amounts of OC in light fraction (LF) and heavy fraction (HF) increased with the increasing percentage of nanozeolite and plant residues in the soil. The highest amounts of LF (7.54 g LF. kg -1 Soil ) and HF (11.10 g kg -1 Soil ) were found when 30 % nanozeolite and 5 % wheat and alfalfa straws were added to the soil. Accordingly, wheat and alfalfa straws were effective on increasing the LF and HF, respectively. However, they decreased with declining the OC from the 1st day of experiment until the 90th day of experiment. Soluble OC in hot (2.22 g kg -1Soil ) and cool (1.54 g kg -1Soil ) water fractions increased by addition of 30 % nanozeolite and 5 % plant residues particularly alfalfa straw in comparison with control. Although these soluble fractions increased after initial 30 days of incubation, they decreased in the continuation of the experiment. Conclusion In fact, OC contents in density and soluble fractions increased by addition of 30 % nanozeolite and 5 % plant residues into the soil; however, they decreased in initial 30 days of incubation with declining the OC. The findings of this research revealed the application of nanozeolite and plant residues improved carbon pools in density and soluble fractions and carbon sequestration increased by increasing OC contents in soil.

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“…Results from SOM fractionation studies revealed that intensification of land use resulted in a loss of carbon stored in 'macro'-aggregates (Christensen 1992;Feigl et al 1995;Puget et al 1995;Magid et al 1996). Up to 50% of the native soil carbon content is lost due to aggregate disintegration as a result of mechanical impact (e.g.…”

Section: Introductionmentioning

confidence: 99%

Soil organic matter dynamics after the conversion of arable land to pasture

Römkens¹,

Plicht

Hassink³

1999

Biology and Fertility of Soils

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In search of the elusive “active” fraction of soil organic matter: Three size-density fractionation methods for tracing the fate of homogeneously 14C-labelled plant materials

Cited by 115 publications

References 28 publications

Carbon and nitrogen contents of different-sized light fraction organic matter as influenced by tillage and residue management

Carbon and nitrogen contents of different-sized light fraction organic matter as influenced by tillage and residue management

Assessment of changes in different fractions of the organic carbon in a soil amended by nanozeolite and some plant residues: incubation study

Soil organic matter dynamics after the conversion of arable land to pasture

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