14C-labelled ryegrass turnover and residence times in soils varying in clay content and mineralogy

Saggar, Surinder; Parshotam, A.; Sparling, G.P.; Feltham, C.W.; Hart, P. B. S.

doi:10.1016/s0038-0717(96)00250-7

Cited by 188 publications

(110 citation statements)

References 25 publications

Supporting

Mentioning

101

Contrasting

Unclassified

Order By: Relevance

“…In agreement with Feller and Beare (1997) we found that volcanic ash soils have higher soil C storage per unit silt + clay compared to the sedimentary soils. Normally this is explained by the high specific surface area of allophane in combination with large amounts of non-crystalline compounds which cause the higher carbon storage per unit silt + clay in volcanic ash soils (Saggar et al 1996;Six et al 2002).…”

Section: Discussionmentioning

confidence: 99%

“…However, other field studies do not support this observation (Desjardins et al 1994(Desjardins et al , 2004Feigl et al 1995;Koutika et al 1997;Powers and Veldkamp 2005;Schwendenman and Pendall 2006). Texture effects are often masked by other effects like clay mineralogy, land use history, or management (Saggar et al 1996;de Koning et al 2003;Powers and Veldkamp 2005). In the volcanic soils, we found no evidence that the amount of noncrystalline compounds contribute to stabilization of recently incorporated soil C. In contrast, the mean 14 C age of total soil C was related to non-crystalline compounds in soils of volcanic parent material (Torn et al 1997) and to the chelation of Al and Fe by organic ligands in temperate Inceptisols, Mollisols and Alfisols (Masiello et al 2004).…”

Section: Sitementioning

confidence: 99%

See 1 more Smart Citation

Stabilization of recent soil carbon in the humid tropics following land use changes: evidence from aggregate fractionation and stable isotope analyses

et al. 2008

View full text Add to dashboard Cite

Quantitative knowledge of stabilizationand decomposition processes is necessary to understand, assess and predict effects of land use changes on storage and stability of soil organic carbon (soil C) in the tropics. Although it is well documented that different soil types have different soil C stocks, it is presently unknown how different soil types affect the stability of recently formed soil C. Here, we analyze the main controls of soil C storage in the top 0.1 m of soils developed on Tertiary sediments and soils developed on volcanic ashes. Using a combination of fractionation techniques with 13 C isotopes analyses we had the opportunity to trace origin and stability of soil carbon in different aggregate fractions under pasture and secondary forest. Soil C contents were higher in volcanic ash soils (47-130 g kg -1 ) than in sedimentary soils (19-50 g kg -1 ). Mean residence time (MRT) of forest-derived carbon in pastures increased from 37 to 57 years with increasing silt + clay content in sedimentary soils, but was independent from soil properties in volcanic ash soils. MRTs of pasture-derived carbon in secondary forests were considerably shorter, especially in volcanic ash soils, where no pasture-derived carbon could be detected in any of the four studied secondary forests. The implications of these results are that the MRT of recently incorporated organic carbon depends on clay mineralogy and is longer in soils dominated by smectite than non-crystalline minerals. Our results show that the presence of soil C stabilization processes, does not necessarily mean that recent incorporated soil C will also be effectively stabilized.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Sitementioning

confidence: 99%

Stabilization of recent soil carbon in the humid tropics following land use changes: evidence from aggregate fractionation and stable isotope analyses

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Involvement of clay minerals in the sorption of ionic pesticides, especially in subsoil horizons, has been reported (e.g., Seybold et al 1994). Saggar et al (1996) have shown that the nature of organic carbon varied between allophanic and nonallophanic soils.…”

Section: -Omentioning

confidence: 99%

Adsorption of atrazine and phosphate as affected by soil depth in allophanic and non‐allophanic soils

Magesan

Bolan

Lee

2003

New Zealand Journal of Agricultural Research

View full text Add to dashboard Cite

Quantification of soil processes, such as adsorption, is needed for predicting the fate of agricultural chemicals in soils. Adsorption is affected by soil properties, which vary with depth. We conducted a laboratory study to determine the influence of soil depth on the adsorption of an organic solute (atrazine) in both allophanic and non-allophanic soils, and an inorganic solute (phosphate) in two non-allophanic soils. Adsorption isotherms of atrazine and phosphate were determined using 14 C-labelled atrazine and KH 2 PO 4 , respectively, in batch equilibrium. The adsorption isotherms for atrazine were almost linear, and adequately described by the Freundlich equation. For phosphate the adsorption isotherms exhibited substantially more curvature and were best described by the Langmuir equation for one of the soils. Generally, adsorption of both solutes decreased with depth. While atrazine adsorption appeared related to such factors as percentage clay content, total C, cation exchange capacity (CEC), and surface area, no similar relationships appeared apparent for phosphate adsorption.

show abstract

“…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%

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

View full text Add to dashboard Cite

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

show abstract

14C-labelled ryegrass turnover and residence times in soils varying in clay content and mineralogy

Cited by 188 publications

References 25 publications

Stabilization of recent soil carbon in the humid tropics following land use changes: evidence from aggregate fractionation and stable isotope analyses

Stabilization of recent soil carbon in the humid tropics following land use changes: evidence from aggregate fractionation and stable isotope analyses

Adsorption of atrazine and phosphate as affected by soil depth in allophanic and non‐allophanic soils

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

Contact Info

Product

Resources

About