Solute Movement in the Soil-Root System

Nye, P. H.; Tinker, P. B.; Boast, C. W.

doi:10.1097/00010694-197904000-00015

Cited by 398 publications

(336 citation statements)

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“…Fine root acquisition of soil water and nutrients depends on root surface quantity and activity (J3oyer 1985;Nye and Tinker 1977;Yanai et al 1995). However, reported responses of root biomass and RLD to resource availability are inconsistent.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal patterns of root distribution in developing stands of four woody crop species grown with drip irrigation and fertilization

Coleman

2007

Plant Soil

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In forest trees, roots mediate such significant carbon fluxes as primary production and soil C 0 2 efflux. Despite the central role of roots in these critical processes, information on root distribution during stand establishment is limited, yet must be described to accurately predict how various forest types, which are growing with a range of resource limitations, might respond to environmental change. This study reports root length density and biomass development in young stands of eastern cottonwood (Populus deltoidies Bartr.) and American sycamore (Platanus occidentalis L.) that have narrow, high resource site requirements, and compares them with sweetgum (Liquidambar styraczj7ua L.) and loblolly pine (Pinus taeda L.), which have more robust site requirements. Fine roots (<1 mm), medium roots (1 to 5 mm) and coarse roots (>5 mm) were sampled to determine spatial distribu-

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Section: Introductionmentioning

confidence: 99%

Spatial and temporal patterns of root distribution in developing stands of four woody crop species grown with drip irrigation and fertilization

Coleman

2007

Plant Soil

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“…Continuous manipulation of root system and the photoelectric scanner strongly dehydrated the root system, and almost 80% of its mass was lost as water. Hence, the dry mass must be used for calculating the ratio between the mass of the root sample and the entire root system, although the turgid root fresh weight provides an estimation of root volume (Nye & Tinker, 1977).…”

Section: Resultsmentioning

confidence: 99%

“…and digital image analysis did not introduce additional experimental errors besides those involved in plant growth and harvest. Root length has been used more often to describe root systems, mainly due to the widespread line-intercept method, but root area has been applied in many nutrient and water absorption studies (Nye & Tinker, 1977;Barber, 1984). Richner et al (2000) argued that surface area measurements by image analysis are expected to compact extraneous objects, which falsely increase the area of a sample even more than the length.…”

Section: Resultsmentioning

confidence: 99%

Sample size for measurement of root traits on common bean by image analysis

Araújo

Fernandes

Kubota

et al. 2004

Pesq. agropec. bras.

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-Evaluation of root traits may be facilitated if they are assessed on samples of the root system. The objective of this work was to determine the sample size of the root system in order to estimate root traits of common bean (Phaseolus vulgaris L.) cultivars by digital image analysis. One plant was grown per pot and harvested at pod setting, with 64 and 16 pots corresponding to two and four cultivars in the first and second experiments, respectively. Root samples were scanned up to the completeness of the root system and the root area and length were estimated. Scanning a root sample demanded 21 minutes, and scanning the entire root system demanded 4 hours and 53 minutes. In the first experiment, root area and length estimated with two samples showed, respectively, a correlation of 0.977 and 0.860, with these traits measured in the entire root. In the second experiment, the correlation was 0.889 and 0.915. The increase in the correlation with more than two samples was negligible. The two samples corresponded to 13.4% and 16.9% of total root mass (excluding taproot and nodules) in the first and second experiments. Taproot stands for a high proportion of root mass and must be deducted on root trait estimations. Samples with nearly 15% of total root mass produce reliable root trait estimates.Index terms: Phaseolus vulgaris, root area, root length, sampling. Tamanho da amostra para determinação de caracteres radiculares do feijoeiro pela análise de imagensResumo -A avaliação de caracteres radiculares pode ser facilitada se realizada em amostras do sistema radicular. O objetivo deste trabalho foi delimitar o tamanho de amostras para determinação de caracteres radiculares no feijoeiro (Phaseolus vulgaris L.) pela análise digital de imagens. Cultivou-se uma planta por vaso, que foi colhida na emissão de vagens, em 64 e 16 vasos correspondentes a duas e quatro cultivares no primeiro e segundo experimentos, respectivamente. Amostras das raízes foram digitalizadas até completar o sistema radicular, estimando-se a área e comprimento radiculares. A digitalização de uma amostra demandou 21 minutos, e de todo o sistema radicular, 4 horas e 53 minutos. No primeiro experimento, a área e comprimento radicular estimados com duas amostras apresentaram, respectivamente, correlação de 0,977 e 0,860 com estes caracteres mensurados na raiz inteira; no segundo experimento, a correlação foi 0,889 e 0,915. O aumento da correlação com mais de duas amostras foi desprezível. As duas amostras corresponderam a 13,4% e 16,9% da massa radicular total (excluindo nódulos e pivotante) no primeiro e segundo experimentos. A raiz pivotante constitui elevada proporção da massa radicular e deve ser descontada na estimativa de caracteres radiculares por amostragem. Amostras com cerca de 15% da massa radicular total fornecem estimativas confiáveis de caracteres radiculares.Termos para indexação: Phaseolus vulgaris, área radicular, comprimento radicular, amostragem.

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“…Portanto, a relação direta entre o conteúdo volumétrico de água e o coeficiente de difusão (Eq. 2) indica que o aumento da umidade do solo causa maior fluxo difusivo de elementos no solo (Nye & Tinker, 1977;Barber 1995, Novais & Smyth, 1999. Efeitos positivos de maior teor de água do solo sobre maior fluxo difusivo de P (Villani et al, 1993a,b) e de Al (Oliveira et al, 2000) foram encontrados.…”

Section: Summary: Diffusive Flux Of Iron In Soils Influenced By Phospunclassified

“…O fluxo difusivo de um nutriente em solos é expresso pela Lei de Fick (Nye & Tinker, 1977;Barber, 1995;Novais & Smyth, 1999):…”

Section: Introductionunclassified

Fluxo difusivo de ferro em solos sob influência de doses de fósforo e de níveis de acidez e umidade

Nunes

Novais²,

Silva³

et al. 2004

Rev. Bras. Ciênc. Solo

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Solute Movement in the Soil-Root System

Cited by 398 publications

References 0 publications

Spatial and temporal patterns of root distribution in developing stands of four woody crop species grown with drip irrigation and fertilization

Spatial and temporal patterns of root distribution in developing stands of four woody crop species grown with drip irrigation and fertilization

Sample size for measurement of root traits on common bean by image analysis

Fluxo difusivo de ferro em solos sob influência de doses de fósforo e de níveis de acidez e umidade

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