14C-labelled glucose turnover in New Zealand soils

Saggar, Surinder; Parshotam, A.; Hedley, C. B.; Salt, G. J.

doi:10.1016/s0038-0717(99)00126-1

Cited by 115 publications

(37 citation statements)

References 20 publications

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“…(1) in Table 4 (again a linear function based on only two points). Thus our result may support the conclusion of Saggar et al (1999), that the particle size effect results from a protection of MB and its metabolites rather than from adsorption of humified compounds on the clay surfaces, as the effect is achieved by microbial respiration only, and as k HL , k HLS and k HS (Fig. 1) are apparently not changed.…”

Section: Effects Of Abiotic Soil Propertiessupporting

confidence: 88%

“…The microbial processes largely occur at the particle surfaces (Robert and Chenu, 1992); thus the microorganisms and the microbial decay products are both influenced by the quality of the mineral environment. Saggar et al (1996Saggar et al ( , 1999) incubated 14 C-labelled glucose and rye grass in grassland soils containing clays in varying amounts and from the major mineralogical classes. The authors showed that the stabilisation of the labelled organic matter is dependent upon the surface areas rather than upon the amount of clay.…”

Section: Effects Of Abiotic Soil Propertiesmentioning

confidence: 99%

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Factors controlling decomposition of soil organic matter in fallow systems of the high tropical Andes: A field simulation approach using 14C- and 15N-labelled plant material

Bottner¹,

Pansu

Sarmiento

et al. 2006

Soil Biology and Biochemistry

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N-rich (C:N ¼ 27) and N-poor (C:N ¼ 130) wheat straw, labelled with 14 C and 15 N, was incubated for 2 yr in two major ecosystems of the upper elevation belt of cultivation in the high Andes: the moist Paramo (precipitation ¼ 1329 mm, altitude ¼ 3400 m asl, Andes of Merida, Venezuela) and the dry Puna (precipitation ¼ 370 mm, altitude ¼ 3800 m asl, Central Altiplano, Bolivia). The experiment was installed in young (2 yr) and old (7 yr) fallow plots. The following soil analyses were performed at nine sampling occasions: soil moisture, total-14 C and -15 N, and Microbial Biomass (MB)-14 C and -15 N. The measured data were fitted by the MOMOS-6 model (a process based model, with five compartments: labile and stable plant material, MB, and labile (HL) and stable humus (HS)) coupled with the SAHEL model (soil moisture prediction) using daily measured and/or predicted meteorological data. The aim was to understand how (1) the climatic conditions, (2) the quality of plant material, (3) the fallow age and (4) the soil properties affect the cycling of C and N within the soil organic matter system. The fallow age (2 and 7 yr) did not affect the measured data or the model predictions, indicating that in these systems the decomposition potential is not affected by fallow length. During the short initial active decomposition phase, the labile plant material was quickly exhausted, enabling a build up of MB and of HL. During the low activity phase, that covered 4/5 of the time of exposure, the MB size decreased slowly and the HL pool was progressively exhausted as it was reused by the MB as substrate. The HL compartment was directly or indirectly the major source for the inorganic 15 N production. If the C:N ratio of the added plant material increased, the model predicted (1) a reduction of the decomposition rates of the plant material (essentially the stable plant material) and (2) an increased mortality of the MB which increased the production of HL (microbial cadavers and metabolites). Thus the essential effect of the slower decomposition due to the N-poor plant material was a higher accumulation of C and N in the HL and its slower recycling by the MB during the low activity phase. The labelling experiment allows to understand the higher soil native organic matter content in Paramo soils compared to Puna. The large sequestration of organic matter generally observed in the Paramo soils can be explained by two abiotic factors: the unfavourable soil microstructure and the accumulation of free aluminium linked to the climatic and acid soil conditions, inhibiting the microbial activity physically and chemically. r

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Section: Effects Of Abiotic Soil Propertiessupporting

confidence: 88%

Section: Effects Of Abiotic Soil Propertiesmentioning

confidence: 99%

Factors controlling decomposition of soil organic matter in fallow systems of the high tropical Andes: A field simulation approach using 14C- and 15N-labelled plant material

Bottner¹,

Pansu

Sarmiento

et al. 2006

Soil Biology and Biochemistry

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“…The higher EC in HEC than in LEC soil presumably explained the lower amount of glucose 14 C respired to 14 CO 2 , although the effect of other soil characteristics on glucose decomposition can not be ruled out. Clay content has often been found to affect the decomposition of organic material fertilization (Sørensen, 1981;van Veen et al, 1985;Amato & Ladd, 1992) as does the pH (Saggar et al, 1999), but pH and clay were similar in both soils. The specific surface area of the clay, and the nature rather than the amount of the clay mineral has also been found to affect the decomposition of organic material (Saggar et al, 1996;Torn et al, 1997), but this effect is presumably more important in the long term than in short-term laboratory incubation experiments.…”

Section: Concentration Of Extractable 14 Cmentioning

confidence: 90%

“…0.94 dS m -1 (low EC; LEC) and 6.72 dS m -1 (high EC; HEC) were amended with or without 14 C-labeled glucose and with or without (NH 4 ) 2 SO 4 . The 14 Clabeled glucose is routinely used to determine effects of soil characteristics on mineralization of organic material (Saggar et al, 1999). The objective of this study was to investigate the effect of EC and inorganic N on the decomposition of organic matter in two soils of Guanajuato State, Mexico.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of 14C-labeled glucose and ammonium in saline arable soils

Vuelvas-Solórzano

Hernández-Matehuala

Conde-Barajas

et al. 2009

Rev. Bras. Ciênc. Solo

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SUMMARYOrganic matter dynamics and nutrient availability in saline agricultural soils of the State of Guanajuato might provide information for remediation strategies. 14 C labeled glucose with or without 200 mg kg -1 of NH 4 + -N soil was added to two clayey agricultural soils with different electrolytic conductivity (EC), i.e. 0.94 dS m -1 (low EC; LEC) and 6.72 dS m -1 (high EC; HEC), to investigate the effect of N availability and salt content on organic material decomposition. Inorganic N dynamics and production of CO 2 and 14 CO 2 were monitored. Approximately 60 % of the glucose-14 C added to LEC soil evolved as 14 CO 2 , but only 20 % in HEC soil after the incubation period of 21 days. After one day, < 200 mg 14 C was extractable from LEC soil, but > 500 mg 14 C from HEC soil. No N mineralization occurred in the LEC and HEC soils and glucose addition reduced the concentrations of inorganic N in unamended soil and soil amended with NH 4 + -N. The NO 2 -and NO 3 -concentrations were on average higher in LEC than in HEC soil, with exception of NO 2 -in HEC amended with NH 4 + -N. It was concluded that increases in soil EC reduced mineralization of the easily decomposable C substrate and resulted in Ndepleted soil.Index terms: dynamics of inorganic N, emission of 14 CO 2 and 12 CO 2 , saline soils. Os conhecimentos sobre a dinâmica da matéria orgânica e disponibilidade de nutrientes em solos salinos podem ser úteis para nortear a adoção de estratégias de recuperação e manejo. O objetivo deste trabalho foi avaliar o efeito da condutividade elétrica (EC) e presença de N inorgânico na decomposição da matéria orgânica a dois solos salinos localizados em Guanajuato (México). Nesse sentido, glicose marcada com 14 C com ou sem amônio na dose de 200 mg kg -1 de N foi adicionada em dois tipos de solo com valores de condutividade elétrica de 0,94 dS m -1 (baixo EC; LEC) e 6,72 dS m -1 (alta EC; HEC). Amostras de solos foram incubadas durante 21 dias e, ao longo desse tempo, foram avaliadas as concentrações de N inorgânico e a produção de 12 CO 2 e 14 CO 2 . Após o período de incubação, aproximadamente 60 % da glicose marcada com 14 C adicionado ao solo LEC evoluiu como 14 CO 2 , mas somente 20 % no solo HEC a evolução de 14 CO 2 foi de apenas 20 %. Decorrido um dia de incubação, menos de 200 mg de 14 C foram extraídos do solo LEC, ao passo que no solo HEC foram extraídos mais de 500 mg de 14 C. Não ocorreu mineralização de N nos dois solos e a adição de glicose reduziu as concentrações de N inorgânico no solo controle e no solo que recebeu N-NH 4 + . As concentrações de NO 2 -e NO 3 -foram, em média, maiores no solo LEC do que no solo HEC, com exceção do teor de NO 2 -, que foi maior no HEC tratado com NH 4 + . O aumento da condutividade elétrica promoveu a redução da mineralização de substrato facilmente decomponível e a diminuição do teor de N no solo.Termos de indexação: dinâmica de nitrogênio inorgânico, emissão de 12 CO 2 e 14 CO 2 , solos salinos.

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“…In contrast to the substantial number of studies that have analyzed the surface properties of larger particles, studies on detailed size distributions of surface properties in the soil clay fraction (<2 μm) are rather scarce. Nevertheless, many soil processes are determined by the nature of the clay fraction (Hillel, 1998;Kiem and Kögel-Knabner, 2002;Saggar et al, 1999;Wu et al, 2012;Yonekura et al, 2013). In this size fraction, soil particles within the nanoscale or colloidal range (< 1 μm) are vital and ubiquitous components in natural systems including soils, water, and atmospheric aerosol (Brunekreef and Russell, 2009;Schmidt, 2010).…”

Section: Introductionmentioning

confidence: 99%

Unraveling the size distributions of surface properties for purple soil and yellow soil

Tang

Liu

et al. 2015

Journal of Environmental Sciences

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Soils contain diverse colloidal particles whose properties are pertinent to ecological and human health, whereas few investigations systematically analyze the surface properties of these particles. The objective of this study was to elucidate the surface properties of particles within targeted size ranges (i.e. > 10, 1-10, 0.5-1, 0.2-0.5 and <0.2 μm) for a purple soil (Entisol) and a yellow soil (Ultisol) using the combined determination method. The mineralogy of corresponding particle-size fractions was determined by X-ray diffraction.We found that up to 80% of the specific surface area and 85% of the surface charge of the entire soil came from colloidal-sized particles (< 1 μm), and almost half of the specific surface area and surface charge came from the smallest particles (< 0.2 μm). Vermiculite, illite, montmorillonite and mica dominated in the colloidal-sized particles, of which the smallest particles had the highest proportion of vermiculite and montmorillonite. For a given size fraction, the purple soil had a larger specific surface area, stronger electrostatic field, and higher surface charge than the yellow soil due to differences in mineralogy.Likewise, the differences in surface properties among the various particle-size fractions can also be ascribed to mineralogy. Our results indicated that soil surface properties were essentially determined by the colloidal-sized particles, and the < 0.2 μm nanoparticles made the largest contribution to soil properties. The composition of clay minerals within the diverse particle-size fractions could fully explain the size distributions of surface properties.

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14C-labelled glucose turnover in New Zealand soils

Cited by 115 publications

References 20 publications

Factors controlling decomposition of soil organic matter in fallow systems of the high tropical Andes: A field simulation approach using 14C- and 15N-labelled plant material

Factors controlling decomposition of soil organic matter in fallow systems of the high tropical Andes: A field simulation approach using 14C- and 15N-labelled plant material

Dynamics of 14C-labeled glucose and ammonium in saline arable soils

Unraveling the size distributions of surface properties for purple soil and yellow soil

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