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Sah, R. N.; Brown, Patrick H.

doi:10.1023/a:1004251606504

Cited by 65 publications

(23 citation statements)

References 174 publications

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“…The coniferous spruce (P. abies L.) has generally high lignin:N ratios (e.g. Bagherzadeh 2004;Zhang and Makeschin 2004;Sah 2005). N-content of green needles collected during the experiment (n = 4), and determined with a CNS-analyzer (Westerman 1990), was relatively low with values of 15 (±1) mg g -1 .…”

Section: Study Sitesmentioning

confidence: 99%

“…N-content of green needles collected during the experiment (n = 4), and determined with a CNS-analyzer (Westerman 1990), was relatively low with values of 15 (±1) mg g -1 . N-content in fresh needle litter was not measured, but probably ranged from 8 to 9 mg g -1 (Bagherzadeh 2004;Sah 2005). Beech (F. sylvatica L.) and hornbeam (C. betulus L.) are both deciduous species, but also clearly differ in litter quality.…”

Section: Study Sitesmentioning

confidence: 99%

“…However, in our study, even though litter decomposition in the organic layer was clearly affected, initial N-contents probably ranged from 8 to 14 mg g -1 , which may have been too small for large effects on N-cycling. Also, initial litter N-content may have increased compared to natural levels by high atmospheric N-deposition, which further masks differences between species (Gundersen et al 1998;Sah 2005). However, differences between species may also be overruled by different soil conditions.…”

Section: Differences In N-cycling Between Speciesmentioning

confidence: 99%

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Paradoxical differences in N-dynamics between Luxembourg soils: litter quality or parent material?

Kooijman

Smit

2009

Eur J Forest Res

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To explore whether litter quality could alter differences in N-dynamics between soil types, we compared spruce and beech growing on soils with parent material sandstone and limestone, and beech and hornbeam on acid marl and limestone. We measured pH, organic matter content, C:N ratio, soil respiration and net N-mineralization of the organic layer and the mineral topsoil in a laboratory incubation experiment and estimated gross N-mineralization and immobilization with a simulation model. Species effects were restricted to the organic layer, but higher mass for low-degradable species was compensated by higher process rates for high-degradable ones, so N-dynamics per square metre did not differ. Also, the mineral topsoil was not affected by litter quality, which may have been overruled by soil conditions. Forest soils formed from different parent materials, however, clearly differed in N-dynamics, although different from expectations for net N-mineralization. Sandstone showed low respiration and gross N-mineralization, but net N-mineralization was higher than expected, probably due to low microbial N-demand. In contrast, limestone, and to some extent acid marl, showed high respiration and gross N-release, but lower net N-mineralization than expected, because microbial immobilization was also high. Simulated gross N-mineralization even showed a negative instead of positive correlation with net N-mineralization, probably due to the strong increase in immobilization when gross N-mineralization is high. The shift in microbial N-demand may in turn be related to a more general shift from bacteria to fungi over pH-gradients.

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Section: Study Sitesmentioning

confidence: 99%

Section: Study Sitesmentioning

confidence: 99%

Section: Differences In N-cycling Between Speciesmentioning

confidence: 99%

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Paradoxical differences in N-dynamics between Luxembourg soils: litter quality or parent material?

Kooijman

Smit

2009

Eur J Forest Res

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“…DTPA is a chelating agent that binds to the free-ions of these metals and reduces their activity in solution, thereby mimicking plant uptake and stimulating the replenishment of the metal ions in solution from the solid phase (Sims and Johnson, 1991). Although DTPA extraction has been shown to be effective to test for available B (Matsi et al, 2000), the hot-water method (Bell, 1997) is the established method for determination of extractable B in combination with inductively coupled plasma (ICP) or spectrophotometric determination (Sah and Brown, 1997). DTPA-extractable soil concentrations of Cu, Mn, and Zn, as well as hot-water extractable B, are often significantly correlated with plant uptake of these elements (Sims and Johnson, 1991).…”

Section: Introductionmentioning

confidence: 99%

Soil and Crop Micronutrient Concentrations as Modified by Wastewater Sludge

McGonigle

Evans

Wells³

2014

JEE

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Soil extracts are used to provide a measure of plant nutrient bioavailability, but their predictive capacity is variable. In a greenhouse experiment, soil was amended with sewage sludge from textile manufacturing wastewater. We investigated the correspondence between maize (Zea mays L.) shoot uptake and concentrations in soil extractions for plant essential micronutrients concentrated in the sludge: B, Cu, Mn, and Zn. Hot water extract was used for B, whereas diethylene triamine pentaacetic acid (DTPA) extract was used for Cu, Mn, and Zn. Separate pots with NH 4 NO 3 amendment, but no sludge, allowed comparison of soil micronutrient extraction and plant uptake under conditions of elevated mineral N fertility similar to those with sludge amendment, but in the absence of sludge. Addition of sludge did not change soil extractable concentrations nor shoot concentrations of B and Zn. B was ISSN 2157-6092 2014 www.macrothink.org/jee 34 abundant in the sludge but likely remained strongly bound as organic complexes, whereas the quantity of Zn was not high enough to register difference. Shoot Mn was increased by both sludge amendment and an NH 4 NO 3 effect, likely from pH decrease associated with nitrification of the ammonium in the sludge and in the fertilizer. DTPA-extractable Mn increased in sludge-amended plots. DTPA-extractable Cu increased strongly following sludge amendment, but, in contrast to Mn, shoot Cu concentration was not changed. Thus, selectivity of roots to avoid Cu is not revealed by DTPA. The correspondence between extraction-based estimation of availability and the actual plant uptake varies among micronutrients due to effects of soil conditions and selectivity of roots. Journal of Environment and Ecology

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“…17,18 A determinação de B por meio da diluição isotópica em ICP-MS é considerada a mais exata técnica para análises quantitativas. 19 Análises isotópicas de B normalmente não sofrem interferências espectroscópicas. Entretanto, vários outros fatores podem influenciar a qualidade dos resultados analíticos, entre os quais: tempo morto dos detectores, efeito espaço/carga, eficiência de transmissão iônica, estabilidade da corrente iônica e resolução espectral.…”

Section: Introductionunclassified

Uso da técnica HRICP-MS na avaliação dos isótopos de boro em eucalipto

Mattiello¹,

Ruíz²,

Silva³

et al. 2011

Quím. Nova

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10B isotope tracer technique is essential to study the B mobility in plants. Factors that can influence the quality of measured B isotope ratios were optimized experimentally using High Resolution Inductively Coupled Plasma Mass Spectrometry (HRICP-MS). An isotopically certified standard (NIST SRM-951) was used. The best combination was obtained using a resolution of 400, a RF power of 1250 W, followed by 15 measurements over a 10-s integration period each (15*10). Utilizing this approach it was possible to obtain a precision of 0.3 % in standard material and 2z % in the experimental samples. The results show the importance of establishing optimized work conditions before carrying out the analytical series.Keywords: isotope ratio; micronutrients; translocation. INTRODUÇÃOO boro (B) é um elemento quimicamente complexo; depois do carbono, deve ser o elemento de característica físico-química mais intrigante.1 É um elemento essencial para as plantas e sua deficiência afeta o crescimento e produção das culturas em diversas regiões do mundo. 2No solo, os teores disponíveis para as plantas variam entre 0,1 e 2 mg dm -3 de B (B extraído pelo método água quente), 3 e teores foliares entre 20 e 100 mg kg -1 são considerados adequados para a maioria das plantas cultivadas. 4 Os teores de B encontrados em tecido vegetal têm sido usados como indicativo do estado nutricional desse elemento nas plantas.Diversas técnicas têm sido usadas para determinação de B no solo e em tecido vegetal.5 O método colorimétrico é o mais difundido e baseia-se na formação de complexo colorido com acido bórico a pH 5,1, utilizando azometina-H. A intensidade da cor é medida a 420 nm, em espectrofotômetro ou colorímetro. É um método simples, de rápida execução e com sensibilidade apropriada para a maioria dos estudos de fertilidade do solo e nutrição de plantas. A determinação de elementos-traços, entre eles o B, tem sido facilitada após a introdução dos espectrofotômetros de emissão óptica com plasma indutivamente acoplado (ICP-OES), sobretudo pelo baixo limite de detecção, pela ampla faixa de linearidade e pela determinação múltipla de elementos. 6 No entanto, a determinação do teor total de B em tecido vegetal não permite o conhecimento da redistribuição ou remobilização do nutriente entre os órgãos da planta. Também não permite distinguir a origem do B nos estudos de fertilização e absorção do nutriente pelas plantas. Assim, estudos da razão isotópica de B em amostras vegetais são de fundamental importância para a compreensão da absorção e do transporte do nutriente internamente na planta, sendo relevante na distinção dos genótipos quanto à aquisição e utilização do nutriente 7 e na orientação de técnicas mais apropriadas de fertilização.As técnicas tradicionalmente empregadas na determinação de razões isotópicas de B em amostras vegetais são a espectrometria de massas termoiônica (TIMS) e a espectrometria de massas de íon secundário (SIMS).8,9 A TIMS é a técnica mais precisa e sensível e permite a aná-lise por meio de íons positivos 10 ou negat...

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Untitled

Cited by 65 publications

References 174 publications

Paradoxical differences in N-dynamics between Luxembourg soils: litter quality or parent material?

Paradoxical differences in N-dynamics between Luxembourg soils: litter quality or parent material?

Soil and Crop Micronutrient Concentrations as Modified by Wastewater Sludge

Uso da técnica HRICP-MS na avaliação dos isótopos de boro em eucalipto

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