Soil organic carbon and nitrogen sequestration and turnover in aggregates under subtropical leucaena–grass pastures
Kathryn Conrad A , Ram C. Dalal
A B C , Ryosuke Fujinuma A and Neal W. Menzies A
+ Author Affiliations
- Author Affiliations
A The University of Queensland, School of Agriculture and Food Sciences, St Lucia, Qld 4072, Australia.
B Department of Environment and Science, Dutton Park, Brisbane, Qld 4102, Australia.
C Corresponding author. Email: r.dalal@uq.edu.au
Soil Research 56(6) 632-647 https://doi.org/10.1071/SR18016
Submitted: 19 January 2018 Accepted: 30 May 2018 Published: 20 August 2018
Abstract
Stabilisation and protection of soil organic carbon (SOC) in macroaggregates and microaggregates represents an important mechanism for the sequestration of SOC. Legume-based grass pastures have the potential to contribute to aggregate formation and stabilisation, thereby leading to SOC sequestration. However, there is limited research on the C and N dynamics of soil organic matter (SOM) fractions in deep-rooted legume leucaena (Leucaena leucocephala)–grass pastures. We assessed the potential of leucaena to sequester carbon (C) and nitrogen (N) in soil aggregates by estimating the origin, quantity and distribution in the soil profile. We utilised a chronosequence (0–40 years) of seasonally grazed leucaena stands (3–6 m rows), which were sampled to a depth of 0.3 m at 0.1-m intervals. The soil was wet-sieved for different aggregate sizes (large macroaggregates, >2000 µm; small macroaggregates, 250–2000 µm; microaggregates, 53–250 µm; and <53 µm), including occluded particulate organic matter (oPOM) within macroaggregates (>250 µm), and then analysed for organic C, N and δ13C and δ15N. Leucaena promoted aggregation, which increased with the age of the leucaena stands, and in particular the formation of large macroaggregates compared with grass in the upper 0.2 m. Macroaggregates contained a greater SOC stock than microaggregates, principally as a function of the soil mass distribution. The oPOM-C and -N concentrations were highest in macroaggregates at all depths. The acid nonhydrolysable C and N distribution (recalcitrant SOM) provided no clear distinction in stabilisation of SOM between pastures. Leucaena- and possibly other legume-based grass pastures have potential to sequester SOC through stabilisation and protection of oPOM within macroaggregates in soil.
Additional keywords: carbon sequestration, legume–grass pastures, Leucaena leucocephala, soil aggregates, soil organic carbon, total soil nitrogen.
References
Anderson DW, Schoenau JJ (2008) Soil humus fractions. In ‘Soil sampling and methods of analysis’. 2nd edn. (Eds MR Carter, EG Gregorich) pp. 675–680. (CRC Press: Boca Raton, FL)Angers DA, Bullock MS, Mehuys GR (2008) Aggregate stability to water. In ‘Soil sampling and methods of analysis’. 2nd edn. (Eds MR Carter, EG Gregorich) pp. 811–819. (CRC Press: Boca Raton, FL)
Balesdent J, Mariotti A (1996) Measurement of soil organic matter turnover using 13C natural abundance. In ‘Mass spectrometry of soils’. (Eds TW Boutton, S-i Yamasaki) pp. 83–111. (Marcel Dekker: New York)
Bernoux M, Cerri CC, Neill C, de Moraes JFL (1998) The use of stable carbon isotopes for estimating soil organic matter turnover rates. Geoderma 82, 43–58.
| The use of stable carbon isotopes for estimating soil organic matter turnover rates.Crossref | GoogleScholarGoogle Scholar |
Cambardella CA, Elliott ET (1993a) Carbon and nitrogen distribution in aggregates from cultivated and native grassland soils. Soil Science Society of America Journal 57, 1071–1076.
| Carbon and nitrogen distribution in aggregates from cultivated and native grassland soils.Crossref | GoogleScholarGoogle Scholar |
Cambardella CA, Elliott ET (1993b) Methods for physical separation and characterization of soil organic matter fractions. Geoderma 56, 449–457.
| Methods for physical separation and characterization of soil organic matter fractions.Crossref | GoogleScholarGoogle Scholar |
Christensen BT (2001) Physical fractionation of soil and structural and functional complexity in organic matter turnover. European Journal of Soil Science 52, 345–353.
| Physical fractionation of soil and structural and functional complexity in organic matter turnover.Crossref | GoogleScholarGoogle Scholar |
Conant RT, Paustian K, Del Grosso SJ, Parton WJ (2005) Nitrogen pools and fluxes in grassland soils sequestering carbon. Nutrient Cycling in Agroecosystems 71, 239–248.
| Nitrogen pools and fluxes in grassland soils sequestering carbon.Crossref | GoogleScholarGoogle Scholar |
Conrad K (2014) ‘Soil organic carbon sequestration and turnover in leucaena-grass pastures of Southern Queensland.’ (The University of Queensland: Brisbane, Australia)
Conrad KA, Dalal RC, Dalzell SA, Allen DE, Menzies NW (2017) The sequestration and turnover of soil organic carbon in subtropical leucaena-grass pastures. Agriculture, Ecosystems & Environment 248, 38–47.
| The sequestration and turnover of soil organic carbon in subtropical leucaena-grass pastures.Crossref | GoogleScholarGoogle Scholar |
Conrad KA, Dalal RC, Dalzell SA, Allen DE, Fujinuma R, Menzies NW (2018) Soil nitrogen status and turnover in subtropical leucaena-grass pastures as quantified by δ15N natural abundance. Geoderma 313, 126–134.
| Soil nitrogen status and turnover in subtropical leucaena-grass pastures as quantified by δ15N natural abundance.Crossref | GoogleScholarGoogle Scholar |
Dalal RC (1985) Distribution, salinity, kinetic and thermodynamic characteristics of urease activity in a Vertisol profile. Australian Journal of Soil Research 23, 49–60.
| Distribution, salinity, kinetic and thermodynamic characteristics of urease activity in a Vertisol profile.Crossref | GoogleScholarGoogle Scholar |
Dalal R, Bridge BJ (1996) Aggregation and organic matter storage in sub-humid and semi-arid soils. In ‘Structure and organic matter storage in agricultural soils’. (Eds MR Carter, BA Stewart) pp. 263–307. (CRC Press: Boca Raton, FL)
Dinauer RC (Ed.) (1986) ‘Methods of soil analysis: Part 1 physical and mineralogical methods.’ 2nd edn. SSSA Book Series 5. (Soil Science Society of America Inc. and American Society of Agronomy Inc.: Madison, WI)
Dungait JA, Hopkins DW, Gregory AS, Whitmore AP (2012) Soil organic matter turnover is governed by accessibility not recalcitrance. Global Change Biology 18, 1781–1796.
| Soil organic matter turnover is governed by accessibility not recalcitrance.Crossref | GoogleScholarGoogle Scholar |
Elliott ET (1986) Aggregate structure and carbon, nitrogen and phosphorus in native and cultivated soils. Soil Science Society of America Journal 50, 627–633.
| Aggregate structure and carbon, nitrogen and phosphorus in native and cultivated soils.Crossref | GoogleScholarGoogle Scholar |
Elliott ET, Palm CA, Reuss DE, Monz CA (1991) Organic matter contained in soil aggregates from a tropical chronosequence: correction for sand and light fraction. Agriculture, Ecosystems & Environment 34, 443–451.
| Organic matter contained in soil aggregates from a tropical chronosequence: correction for sand and light fraction.Crossref | GoogleScholarGoogle Scholar |
Feller C, Beare MH (1997) Physical control of SOM in the tropics. Geoderma 79, 69–116.
| Physical control of SOM in the tropics.Crossref | GoogleScholarGoogle Scholar |
Follett RF (2001) Organic carbon pools in grazing land soils. In ‘The potential of US grazing lands to sequester carbon and mitigate the greenhouse effect’. (Eds RF Follett, JM Kimble, R Lal) pp. 65–88. (Lewis Publishers: Boca Raton, FL)
Gijsman AJ (1996) Soil aggregate stability and soil organic matter fractions under agropastoral systems established in native savanna. Australian Journal of Soil Research 34, 891–907.
| Soil aggregate stability and soil organic matter fractions under agropastoral systems established in native savanna.Crossref | GoogleScholarGoogle Scholar |
Haynes RJ, Swift RS (1990) Stability of soil aggregates in relation to organic constitutents and soil water content. Journal of Soil Science 41, 73–83.
| Stability of soil aggregates in relation to organic constitutents and soil water content.Crossref | GoogleScholarGoogle Scholar |
Isbell RF (2002) ‘The Australian soil classification.’ (CSIRO Publishing: Melbourne)
Jastrow JD (1996) Soil aggregate formation and the accrual of particulate and mineral-associated organic matter. Soil Biology & Biochemistry 28, 665–676.
| Soil aggregate formation and the accrual of particulate and mineral-associated organic matter.Crossref | GoogleScholarGoogle Scholar |
Jastrow JD, Amonette JE, Bailey VL (2007) Mechanisms controlling soil carbon turnover and their potential application for enhancing carbon sequestration. Climatic Change 80, 5–23.
| Mechanisms controlling soil carbon turnover and their potential application for enhancing carbon sequestration.Crossref | GoogleScholarGoogle Scholar |
Kopittke PM, Harnandez-Soriano MC, Dalal RC, Finn D, Menzies NW, Hoeschen C, Mueller CW (2018) Nitrogen-rich microbial products provide new organo-mineral associations for the stabilization of soil organic matter. Global Change Biology 24, 1762–1770.
| Nitrogen-rich microbial products provide new organo-mineral associations for the stabilization of soil organic matter.Crossref | GoogleScholarGoogle Scholar |
Krull ES, Baldock JA, Skjemstad JO (2003) Importance of mechanisms and processes of the stabilization of soil organic matter for modelling carbon turnover. Functional Plant Biology 30, 207–222.
| Importance of mechanisms and processes of the stabilization of soil organic matter for modelling carbon turnover.Crossref | GoogleScholarGoogle Scholar |
Leavitt SW, Follett RF, Paul EA (1996) Estimation of slow- and fast-cycling soil organic carbon pools from 6N HCl hydrolysis. Radiocarbon 38, 231–239.
| Estimation of slow- and fast-cycling soil organic carbon pools from 6N HCl hydrolysis.Crossref | GoogleScholarGoogle Scholar |
Liao JD, Boutton TW, Jastrow JD (2006) Storage and dynamics of carbon and nitrogen in soil physical fractions following woody plant invasion of grassland. Soil Biology & Biochemistry 38, 3184–3196.
| Storage and dynamics of carbon and nitrogen in soil physical fractions following woody plant invasion of grassland.Crossref | GoogleScholarGoogle Scholar |
López-Ulloa M, Veldkamp E, de Koning GHJ (2005) Soil carbon stabilization in converted tropical pastures and forests depends on soil type. Soil Science Society of America Journal 69, 1110–1117.
| Soil carbon stabilization in converted tropical pastures and forests depends on soil type.Crossref | GoogleScholarGoogle Scholar |
Lützow Mv, Kögel-Knabner I, Ekschmitt K, Matzner E, Guggenberger G, Marschner B, Flessa H (2006) Stabilization of organic matter in temperate soils: mechanisms and their relevance under different soil conditions - a review. European Journal of Soil Science 57, 426–445.
| Stabilization of organic matter in temperate soils: mechanisms and their relevance under different soil conditions - a review.Crossref | GoogleScholarGoogle Scholar |
Midwood AJ, Boutton TW (1998) Soil carbonate decomposition by acid has little effect on δ13C of organic matter. Soil Biology & Biochemistry 30, 1301–1307.
Nelder VJ, Paton CJ (1986) Vegetation survey of Brian Pastures Research Station, Gayndah, Queensland. (Queensland Department of Primary Industries: Brisbane)
Oades JM, Waters AG (1991) Aggregate hierarchy in soils. Australian Journal of Soil Research 29, 815–828.
| Aggregate hierarchy in soils.Crossref | GoogleScholarGoogle Scholar |
Pachas ANA (2017) A study of water use in leucaena-grass systems. PhD Thesis, The University of Queensland, Brisbane, Australia.
Paul EA, Follett RF, Leavitt SW, Halvorson A, Peterson GA, Lyon DJ (1997) Radiocarbon dating for determination of soil organic matter pool sizes and dynamics. Soil Science Society of America Journal 61, 1058–1067.
| Radiocarbon dating for determination of soil organic matter pool sizes and dynamics.Crossref | GoogleScholarGoogle Scholar |
Paul EA, Morris SJ, Conant RT, Plante AF (2006) Does acid hydrolysis-incubation method measure meaningful soil organic carbon pools? Soil Science Society of America Journal 70, 1023–1035.
| Does acid hydrolysis-incubation method measure meaningful soil organic carbon pools?Crossref | GoogleScholarGoogle Scholar |
Plante AF, Conant RT, Paul EA, Paustian K, Six J (2006a) Acid hydrolysis of easily dispersed and microaggregate-derived silt- and clay-sized fractions to isolate resistant organic matter. European Journal of Soil Science 57, 456–467.
| Acid hydrolysis of easily dispersed and microaggregate-derived silt- and clay-sized fractions to isolate resistant organic matter.Crossref | GoogleScholarGoogle Scholar |
Plante AF, Conant RT, Stewart CE, Paustian K, Six J (2006b) Impact of soil texture on the distribution of soil organic matter in physical and chemical fractions. Soil Science Society of America Journal 70, 287–296.
| Impact of soil texture on the distribution of soil organic matter in physical and chemical fractions.Crossref | GoogleScholarGoogle Scholar |
Plante AF, Fernández JM, Haddix ML, Steinweg JM, Conant RT (2011) Biological, chemical and thermal indices of soil organic matter stability in four grassland soils. Soil Biology & Biochemistry 43, 1051–1058.
| Biological, chemical and thermal indices of soil organic matter stability in four grassland soils.Crossref | GoogleScholarGoogle Scholar |
Radrizzani A, Shelton HM, Dalzell SA, Kirchhof G (2011) Soil organic carbon and total nitrogen under Leucaena leucocephala pastures in Queensland. Crop & Pasture Science 62, 337–345.
| Soil organic carbon and total nitrogen under Leucaena leucocephala pastures in Queensland.Crossref | GoogleScholarGoogle Scholar |
Rao IM, Ayarza MA, Thomas RJ (1994) The use of carbon isotope ratios to evaluate legume contribution to soil enhancement in tropical pastures. Plant and Soil 162, 177–182.
| The use of carbon isotope ratios to evaluate legume contribution to soil enhancement in tropical pastures.Crossref | GoogleScholarGoogle Scholar |
Reid E, Sorby P (1986) Soils of the Brian Pastures Research Station Gayndah, Queensland. (Queensland Department of Primary Industries: Brisbane)
Richards AE, Dalal RC, Schmidt S (2009) Carbon storage in a Ferrosol under subtropical rainforest, tree plantations, and pasture is linked to soil aggregation. Australian Journal of Soil Research 47, 341–350.
| Carbon storage in a Ferrosol under subtropical rainforest, tree plantations, and pasture is linked to soil aggregation.Crossref | GoogleScholarGoogle Scholar |
Schmidt MWI, Torn MS, Abiven S, Dittmar T, Guggenberger G, Janssens IA, Kleber M, Kogel-Knabner I, Lehmann J, Manning DAC, Nannipieri P, Rasse DP, Weiner S, Trumbore SE (2011) Persistence of soil organic matter as an ecosystem property. Nature 478, 49–56.
| Persistence of soil organic matter as an ecosystem property.Crossref | GoogleScholarGoogle Scholar |
Six J, Elliott ET, Paustian K, Doran JW (1998) Aggregation and soil organic matter accumulation in cultivated and native grassland soils. Soil Science Society of America Journal 62, 1367–1377.
| Aggregation and soil organic matter accumulation in cultivated and native grassland soils.Crossref | GoogleScholarGoogle Scholar |
Six J, Conant RT, Paul EA, Paustian K (2002) Stabilization mechanisms of soil organic matter: implications for C-saturation of soils. Plant and Soil 241, 155–176.
| Stabilization mechanisms of soil organic matter: implications for C-saturation of soils.Crossref | GoogleScholarGoogle Scholar |
Six J, Bossuyt H, Degryze S, Denef K (2004) A history of research on the link between (micro) aggregates, soil biota and soil organic matter dynamics. Soil & Tillage Research 79, 7–31.
| A history of research on the link between (micro) aggregates, soil biota and soil organic matter dynamics.Crossref | GoogleScholarGoogle Scholar |
Soil Survey Staff (1999) ‘Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys.’ (United States Department of Agriculture: Washington, DC)
Sotomayor-Ramírez D, Espinoza Y, Acosta-Martinez V (2009) Land use effects on microbial biomass C, β-glucoisidase and β-glucosaminidase activities, and availability, storage and age of organic C in soil. Biology and Fertility of Soils 45, 487–497.
| Land use effects on microbial biomass C, β-glucoisidase and β-glucosaminidase activities, and availability, storage and age of organic C in soil.Crossref | GoogleScholarGoogle Scholar |
Tisdall JM, Oades JM (1980) The effect of crop rotation on aggregation in a red brown earth. Australian Journal of Soil Research 33, 141–163.
Tisdall JM, Oades JM (1982) Organic matter and water-stable aggregates in soils. Journal of Soil Science 33, 141–163.
| Organic matter and water-stable aggregates in soils.Crossref | GoogleScholarGoogle Scholar |
van Bavel CHM (1950) Mean weight-diameter of soil aggregates as a statistical index of aggregation. Soil Science Society of America Proceedings 14, 20–23.
| Mean weight-diameter of soil aggregates as a statistical index of aggregation.Crossref | GoogleScholarGoogle Scholar |
Vanlauwe B, Sanginga N, Merckx R (1998) Soil organic matter dynamics after addition of nitrogen-15-labeled leucaena and dactyladenia residues. Soil Science Society of America Journal 62, 461–466.
| Soil organic matter dynamics after addition of nitrogen-15-labeled leucaena and dactyladenia residues.Crossref | GoogleScholarGoogle Scholar |
Wedin DA, Tieszen LL, Dewey B, Pastor J (1995) Carbon isotope dynamics during grass decomposition and soil organic matter formation. Ecology 76, 1383–1392.
| Carbon isotope dynamics during grass decomposition and soil organic matter formation.Crossref | GoogleScholarGoogle Scholar |
Yoder RE (1936) A direct method of aggregate analysis and a study of the physical nature of erosion losses. Journal of the American Society of Agronomy 28, 337–351.
Youkhana A, Idol T (2011) Addition of Leucaena-KX2 mulch in a shaded coffee agroforestry system increases both stable and labile soil C fractions. Soil Biology & Biochemistry 43, 961–966.
| Addition of Leucaena-KX2 mulch in a shaded coffee agroforestry system increases both stable and labile soil C fractions.Crossref | GoogleScholarGoogle Scholar |
