δ13C values of soil organic carbon and their use in documenting vegetation change in a subtropical savanna ecosystem

Boutton, Thomas W.; Archer, Steven R.; Midwood, Andrew J.; Zitzer, Stephen F.; Bol, Roland

doi:10.1016/s0016-7061(97)00095-5

Cited by 466 publications

(417 citation statements)

References 64 publications

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“…During the avulsion process, the main river levee is breached first, and then sand deposits are formed due to the sediments carried by the channel (Törnqvist & Bridge, 2002). Therefore, the impoverishment of the carbon isotopic signal in these sandy layers may have been attributed to the sediments from the levees that were breached during the avulsion process, given that they are covered mainly by C3 plants (Nunes da Cunha & Junk, 2010), generating, therefore, an impoverished carbon signal in sediment deposits (Boutton et al, 1998). However, the isotopic signal analyzed together with the C/N ratio indicate that the signal impoverishment in these sandy layers may be related to a longer flooding period that allowed algal activity (Talbot & Johannessen, 1992;Meyers & Lallier-Vergès, 1999).…”

Section: Discussionmentioning

confidence: 99%

Genesis of textural contrasts in subsurface soil horizons in the Northern Pantanal-Brazil

Nascimento

Furquim

Couto

et al. 2013

Rev. Bras. Ciênc. Solo

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SUMMARYThe Pantanal region can be characterized as a quaternary floodplain with predominant sedimentation in the form of alluvial fans. In the geomorphologic and sedimentary evolution, the avulsion process is inherent to this depositional system and its dynamics, together with surface water floods, influence soil sedimentation on this plain. The knowledge and differentiation of these two events can contribute to a better understanding of the variability of soil properties and distribution under the influence of these sedimentation processes. Therefore, this study investigated the genesis of soils in the Northern Pantanal with textural contrasts in deeper horizons and their relationship with the depositional system dynamics. We analyzed four soil profiles in the region of Barão de Melgaço, Mato Grosso State, Brazil (RPPN SESC Pantanal). Two profiles were sampled near the Rio Cuiabá (AP1 and AP4) and two near the Rio São Lourenço (AP10 and AP11). In AP11, the horizons contrast in particle size between the profile basis and the surface. In AP1, AP4 and AP10, the horizons overlaying the sand layer have similar particle size properties, mainly in terms of sand distribution. In the first case, floods (surface water) seem to have originated the horizons and layers with contrasting texture. In the second case, avulsion is the most pronounced process. Therefore, the two modes can form soils with contrasting texture that are discriminable by soil morphology, based on the distinct features associated to the specific sedimentation processes.Index terms: alluvial soils, hydromorphic soils, fluvial deposition system, alluvial fans, avulsion.(

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Section: Discussionmentioning

confidence: 99%

Genesis of textural contrasts in subsurface soil horizons in the Northern Pantanal-Brazil

Nascimento

Furquim

Couto

et al. 2013

Rev. Bras. Ciênc. Solo

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“…This general cycle of increased C 4 growth during warmer portions of the year and C 3 dominance during cooler portions is consistent with observations reported elsewhere Tieszen et al, 1980). Estimated C 3 /C 4 vegetation percentages were converted into mean landscape δ 13 C values assuming mean values for C 3 (-27‰) and C 4 (-13‰) plants (Boutton et al, 1998).…”

Section: Establishing the Seasonal Cycle In Leporid Tooth δ 13 C Valuesmentioning

confidence: 99%

The use of δ13C values of leporid teeth as indicators of past vegetation

Wicks

Thirumalai

Shanahan

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…This separation of C sources is due to higher discrimination of 13 C in C3 photosynthesis (Calvin cycle) than in C4 photosynthesis (Hatch-Slack pathway) (Farquhar et al 1989). The δ 13 C values from plants with C3 photosynthesis typically range from −40 to −23‰, while those in plants with C4 photosynthesis range from −19 to −9‰ (Boutton et al 1998). After a C3-C4 vegetation change, the relative contribution of new and old SOC can be estimated based on the mass balance of C isotope content and the isotopic signature can thus be used to follow the dynamics of SOC in situ.…”

Section: Introductionmentioning

confidence: 99%

Fate of straw- and root-derived carbon in a Swedish agricultural soil

2017

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To maximise carbon (C) storage in soils, understanding the fate of C originating from aboveground and belowground residues and their interaction with fertiliser under field conditions is critically important. The use of 13 C natural abundance provides unique opportunities to separate both C sources. We investigated the effect of 16 years of C3 straw and C4 root input, with and without nitrogen (N) addition, on SOC stocks and C distribution in soil fractions in the long-term frame trial at Ultuna, Sweden. The straw C input was fixed at 1.77 Mg ha −1 year −1 , while the root input depended on maize plant growth, enabling studies on how N fertilisation affected (i) stabilisation of residues and (ii) plant C allocation to belowground organs. Four treatments were investigated: only maize roots (Control), maize roots with N (Control + N), maize roots and straw (Straw) and maize roots, straw and N (Straw + N). After 16 years, 5.6-8.9% of the total SOC stock in the 0-20 cm soil layer was maize-derived. In all four treatments, the relatively labile SOC fractions decreased, while the proportion of more refractory fractions increased. Based on allometric calculation of root inputs, retention of maize roots was 38, 26, 36 and 18% in the Control, Control + N, Straw and Straw + N treatments, respectively. The estimated retention coefficient of C3 straw in the Straw + N treatment was higher than that in the Straw-N treatment. We interpreted these results thus (1) roots were better stabilised in the soil than straw; (2) N fertilisation caused a shift in root to shoot ratio, with relatively more roots being present in Ndeficient soil; and (3) N fertilisation caused greater stabilisation of residues, presumably due to increased microbial C use efficiency.

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δ13C values of soil organic carbon and their use in documenting vegetation change in a subtropical savanna ecosystem

Cited by 466 publications

References 64 publications

Genesis of textural contrasts in subsurface soil horizons in the Northern Pantanal-Brazil

Genesis of textural contrasts in subsurface soil horizons in the Northern Pantanal-Brazil

The use of δ13C values of leporid teeth as indicators of past vegetation

Fate of straw- and root-derived carbon in a Swedish agricultural soil

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