A weighing lysimeter for determining water loss in red spruce saplings (Picea rubens Sarg.)

Lauver, T.L.; Mandl, Richard H.; Kohut, Robert J.; Laurence, J.A.

doi:10.1016/0098-8472(90)90060-h

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…Weights of individual tree--soil--pot systems were monitored routinely during the experiment with weighing lysimeters (Lauver et al 1990). Deviations in weight from field capacity were used to determine when to water the trees.…”

Section: Tree Wateringmentioning

confidence: 99%

Influence of foliar N on foliar soluble sugars and starch of red spruce saplings exposed to ambient and elevated ozone

1995

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Red spruce (Picea rubens Sarg.) trees growing at high elevation in the northeastern United States have experienced decline in recent years but seedlings have proved to be relatively tolerant of a wide range of environmental stresses in controlled studies. One possible reason for the wide tolerance to stress in seedlings is their inherently large pool of carbohydrate reserves, which is available for maintenance during and regrowth after periods of stress. We tested for the effects of foliar N and exposure to ozone on foliar carbohydrate reserves of 20-year-old naturally regenerated saplings. The trees were maintained in native soil in 360-l containers for 5 years before the experiment. The year before the experiment, trees were fertilized with N,P,K to provide a population of trees from N deficient to N sufficient. As foliar N decreased below 0.9%, length of current-year shoots and specific needle area of current-year needles declined. Foliar N concentration was correlated with foliar sugar and starch concentrations, but relationships varied with time of year. Before bud break, foliar carbohydrates and N, in general, were positively correlated, and date of bud break was delayed in N-deficient trees. During active growth, foliar soluble sugars and N were positively correlated, but starch concentrations were negatively correlated with N. By late September, neither starch nor sugar concentration was correlated with N concentration. Ozone and foliar N concentrations did not interact to change foliar carbohydrate concentrations or shoot and needle growth in this relatively short-term study.

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Section: Tree Wateringmentioning

confidence: 99%

Influence of foliar N on foliar soluble sugars and starch of red spruce saplings exposed to ambient and elevated ozone

1995

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“…(5) indicou que este lisímetro poderia determinar com excelente precisão a variação de umidade no substrato de cultivo, nesta fase de produção de mudas cítricas. Esta precisão se assemelha muito com as obtidas e validadas por Silva (2005), que construiu um lisímetro de pesagem com células de carga hidráulica, e Allen e Fisher (1990), Campeche (2002), Lauver et al (1990), Meshkat et al (1999) e Young et al (1996), que empregaram células de carga eletrônicas no sistema de pesagem.…”

Section: Construção Da Estrutura De Pesagem Móvelunclassified

Desenvolvimento de um lisímetro móvel de pesagem e análise da demanda hídrica e de nutrientes na produção de porta-enxerto cítrico

Santos¹

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AGRADECIMENTOS À Deus, pela infinita bondade e generosidade para comigo, pelos ensinamentos e presença constante, sempre me guiando e protegendo; À Escola Superior de Agricultura "Luiz de Queiroz", pela oportunidade de aperfeiçoar e adquirir novos conhecimentos; Ao professor Dr. Marcos Vinicius Folegatti, pela orientação, amizade, confiança, apoio e inspiração; Ao professor Dr. Fernando Braz Tangerino Hernandez, pelo incentivo e apoio à realização deste mestrado; Aos amigos e conselheiros Dr. Cláudio Ricardo da Silva e José Alves Júnior, pelos incentivos, apoios, paciência e momentos de reflexão; Ao coordenador do curso de Pós-Graduação em Irrigação e Drenagem e Chefe do Departamento de Engenharia Rural, professor Dr. José Antônio Frizzone, pelos ensinamentos e condições oferecidas para a realização deste trabalho; Aos professores do Curso de Pós-Graduação em Irrigação e Drenagem, Dr.

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Design and performance of an acidic precipitation delivery system for field investigations with plants

Lauver

Laurence

Kohut

1990

Arch. Environ. Contam. Toxicol.

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An acidic precipitation delivery system is described that was designed and constructed for use in a field investigation of the response of red spruce saplings (Picea rubens Sarg.) to the interactive stresses of ozone and acid rain. The system utilizes hydraulic, solid-cone spray nozzles to produce simulated rainfall with droplet size distributions approximating natural rain events, which are of low intensity, i.e., about 1-1.5 cm hr(-1), and are relatively uniform in distribution of volume over a 2.4 m diameter plot. Three different pH treatments (3.1, 4.1, 5.1) were dispensed randomly to each of three treatment subplots located in twelve open-top field chambers and three ambient control chambers. Storage capacity of the system permitted a 2.3 hr rain event. Construction materials used were chosen for resistance to the corrosive nature of the rain simulant, stability to ambient UV radiation, and resistance to penetration by sunlight. Simulated events were not synchronized to ambient events, but were scheduled to prevent moisture deficits.

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A weighing lysimeter for determining water loss in red spruce saplings (Picea rubens Sarg.)

Cited by 7 publications

References 10 publications

Influence of foliar N on foliar soluble sugars and starch of red spruce saplings exposed to ambient and elevated ozone

Influence of foliar N on foliar soluble sugars and starch of red spruce saplings exposed to ambient and elevated ozone

Desenvolvimento de um lisímetro móvel de pesagem e análise da demanda hídrica e de nutrientes na produção de porta-enxerto cítrico

Design and performance of an acidic precipitation delivery system for field investigations with plants

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