Microsensor analysis of oxygen and pH in the rice rhizosphere under field and laboratory conditions

Revsbech, Niels Peter; Pedersen, Ole; Reichardt, Wolfgang; Briones, Aurelio

doi:10.1007/s003740050568

Cited by 162 publications

(125 citation statements)

References 31 publications

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“…These are significantly affected by the distribution of oxygen in soil. Oxygen concentrations in the soil usually show vertical gradients with soil depth (Lüdemann et al, 2000) and radial gradients with distance from the root surface (Revsbech et al, 1999). A large amount of the surface roots of DSR may be advantageous in obtaining oxygen from floodwater (Naklang et al, 1996).…”

Section: Nitrification and Denitrificationmentioning

confidence: 99%

Evaluation of nitrogen balance in a direct-seeded-rice field experiment using Hydrus-1D

Šimůnek

Zhang

et al. 2015

Agricultural Water Management

118

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a b s t r a c tNitrogen (N) pollution is a global environmental problem that has greatly increased the risks of both the eutrophication of surface waters and contamination of ground waters. The majority of N pollution mainly comes from agricultural fields, in particular during rice growing seasons. In recent years, a gradual shift from the transplanting rice cultivation method to the direct seeding method has occurred, which results in different water and N losses from paddy fields and leads to distinct impacts on water environments. The N transport and transformations in an experimental direct-seeded-rice (DSR) field in the Taihu Lake Basin of east China were observed during two consecutive seasons, and simulated using Hydrus-1D model. The observed crop N uptake, ammonia volatilization (AV), N concentrations in soil, and N leaching were used to calibrate and validate the model parameters. The two most important inputs of N, i.e., fertilization and mineralization, were considered in the simulations with 220 and 145.5 kg ha −1 in 2008 and 220 and 147.8 kg ha −1 in 2009, respectively. Ammonia volatilization and nitrate denitrification were the two dominant pathways of N loss, accounting for about 16.0% and 38.8% of the total N input (TNI), respectively. Both nitrification and denitrification processes mainly occurred in the root zone. N leaching at 60 and 120 cm depths accounted for about 6.8% and 2.7% of TNI, respectively. The crop N uptake was 32.1% and 30.8% of TNI during the 2008 and 2009 seasons, respectively, and ammonium was the predominant form (74% of the total N uptake on average). Simulated N concentrations and fluxes in soil matched well with the corresponding observed data. Hydrus-1D could simulate the N transport and transformations in the DSR field, and could thus be a good tool for designing optimal fertilizer management practices in the future.

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Section: Nitrification and Denitrificationmentioning

confidence: 99%

Evaluation of nitrogen balance in a direct-seeded-rice field experiment using Hydrus-1D

Šimůnek

Zhang

et al. 2015

Agricultural Water Management

118

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“…For example, the plastic development of lateral roots under drought (Bañoc et al, 2000b) was responsible for increased root surface area and thus, increased soil water extraction (Kamoshita et al, 2000(Kamoshita et al, , 2004Siopongco et al, 2005). The lateral roots under waterlogged (O 2 -deficient) conditions are effective sites for radial oxygen loss, which is essential for detoxifying phytotoxins and oxidizing reduced nutrient element and thus, maintaining the viability of roots for efficient nutrient and water uptake (Revsbech et al, 1999;Kirk, 2003;Armstrong and Armstrong, 2005). Under these conditions, the lateral root production is largely dependent on the extent of the aerenchyma development Gibberd et al, 2001).…”

mentioning

confidence: 99%

Genotypic Variations in Responses of Lateral Root Development to Transient Moisture Stresses in Rice Cultivars

Suralta

Inukai

Yamauchi

2008

Plant Production Science

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“…This allowed a set-up, where the flexible oxygen microelectrode was moved vertically with a micromanipulator (Marzhauser, Germany) in steps of 10 pm towards the root surface. Determination of the position of the root surface was made partly by visual inspection through the glass beaker by means of a dissection microscope (Olympus, Japan) and partly from the electrode signal (Revsbech et al 1998a).…”

mentioning

confidence: 99%

Oxygen dynamics in the rhizosphere of Cymodocea rotundata

Pedersen¹,

Borum²,

Duarte³

et al. 1998

Mar. Ecol. Prog. Ser.

187

151

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The spatial distribution of oxygen and the dynamics of the oxic mlcrozone around roots of Cymodocea rotundata were studied using oxygen microelectrodes under constant light conditions and during light-dark transitions. Under daylight steady state conditions, oxygen was present at concentrations up to 75 % of air saturation at the root surface, and the oxic microzone around the roots was 80 pm thick. Steady state oxygen concentrations were reached within 1.5 h after light-dark shifts. Under darkness, free oxygen, at about 20% of air saturation, was still present on the root surface at steady state, but the thickness of the oxic microzone shrank to 50 pm. The oxygen present in the rhizosphere during darkness was supplied from the water column to roots via, primarily, gas-phase diffusion in leaves and rhizomes. The oxic microzone around roots comprised about 0.5% of the total volume of the seagrass rhlzosphere, and the root-mediated oxygen supply was estimated to be insignificant for the whole sediment oxygen budget contributing about 1 % of total oxygen consumption only. However, the continuous oxygen supply may ensure a persistent oxic environment for belowground tissues of C. rotundata and, hence, protect the plant from reduced phytotoxins.

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Microsensor analysis of oxygen and pH in the rice rhizosphere under field and laboratory conditions

Cited by 162 publications

References 31 publications

Evaluation of nitrogen balance in a direct-seeded-rice field experiment using Hydrus-1D

Evaluation of nitrogen balance in a direct-seeded-rice field experiment using Hydrus-1D

Genotypic Variations in Responses of Lateral Root Development to Transient Moisture Stresses in Rice Cultivars

Oxygen dynamics in the rhizosphere of Cymodocea rotundata

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