Nutrient Distribution and Cycling

Escarré, A.; Roda, Ferran Camas; Terradas, Jaume; Mayor, Xavier

doi:10.1007/978-3-642-58618-7_18

Cited by 11 publications

(9 citation statements)

References 17 publications

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“…The summer litter peak was due to strong water stress and subsequent cavitation and the death of leaves. N resorption was not significantly different from zero, since sudden leaf death probably prevented the hydrolytic process that characterize leaf senescence, as observed in other Quercus species (Escarre´et al, 1999;Silla and Escudero, 2004). During the winter peak, N-resorption efficiency was slightly lower than that reported for adult trees of the same species (Escudero et al, 1992).…”

Section: Biomass and N Lossescontrasting

confidence: 45%

“…So, N cycling and use by plants faces two periods of unfavourable growth conditions: winter (low temperatures) and summer (water shortage). In most woody species, leaves are the main N sinks (Escarre´et al, 1999;Yasumura et al, 2002), but the N allocated to leaves is not recycled indefinitely, with only about half of leaf N resorbed during leaf senescence (Aerts, 1996). Then, leaves face several kinds of biotic (herbivory) and abiotic stress (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Then, leaves face several kinds of biotic (herbivory) and abiotic stress (e.g. frosts, droughts, strong winds) that affect leaf survival and N-resorption efficiency (Escarre´et al, 1999;Silla and Escudero, 2004;Yasumura et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Coupling N Cycling and N Productivity in Relation to Seasonal Stress in Quercus Pyrenaica Willd. Saplings

Silla

Escudero

2006

Plant Soil

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The N economy of saplings of the Mediterranean Quercus pyrenaica Willd. species was analysed at wholeplant level. The amount and timing of N cycling were determined by strong seasonality in N productivity, which peaked in late spring. Most leaf N was allocated to a main first flush of leaves in early spring, and a minor second flush during early summer or autumn. After peak of N productivity, the allocation of biomass production and N resources was mainly switched to lignotuber and coarse roots. Q. pyrenaica displayed a non-conservative pattern of N use as compared with other co-occurring Quercus species. Potential leaf N-resorption efficiency was moderate, but N proficiency was low, which contributed to high losses of N throughout leaf litter and to short mean residence times of N (MRT N ). Additionally, summer water stress reduced foliar area, producing leaf litter with a high N concentration due to almost negligible resorption efficiency, and in some cases, the loss of the whole above-ground fraction. A large investment of plant resources to the root system appeared as a key trait in the N economy and plant fitness of young Q. pyrenaica saplings, allowing them: (1) to counteract N losses and to maintain a positive N balance, (2) to access deep soil resources (water and nutrients), and (3) to 'safe'-store N for coupling supply and demand processes during spring growth or sprouting after a strong summer drought.

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Section: Biomass and N Lossescontrasting

confidence: 45%

Section: Introductionmentioning

confidence: 99%

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Coupling N Cycling and N Productivity in Relation to Seasonal Stress in Quercus Pyrenaica Willd. Saplings

Silla

Escudero

2006

Plant Soil

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“…The total P content in the Quercus ilex biomass of the control plots (2.97 g P m −2 ) is similar to the 2.57-4.57 g P m −2 reported by Santa Regina (2000) in Quercus pyrenaica stands in Spain. In other Quercus ilex stands near our experimental stands, Escarré et al (1999) reported 7.7 g P m −2 . However, these stands were sited on a NW-facing slope and the measurements also took into account the shrub and accompanying trees.…”

Section: Mediterranean Traitsmentioning

confidence: 84%

Increasing drought decreases phosphorus availability in an evergreen Mediterranean forest

2004

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Mediterranean ecosystems are water-limited and frequently also nutrient-limited. We aimed to investigate the effects of increasing drought, as predicted by GCM and eco-physiological models for the next decades, on the P cycle and P plant availability in a Mediterranean forest. We conducted a field experiment in a mature evergreen oak forest, establishing four drought-treatment plots and four control plots (150 m 2 each). After three years, the runoff and rainfall exclusion reduced an overall 22% the soil moisture, and the runoff exclusion alone reduced it 10%. The reduction of 22% in soil moisture produced a decrease of 40% of the accumulated aboveground plant P content, above all because there was a smaller increase in aerial biomass. The plant leaf P content increased by 100 ± 40 mg m −2 in the control plots, whereas it decreased by 40 ± 40 mg m −2 in the drought plots. The soil Po-NaHCO 3 (organic labile-P fraction) increased by 25% in consonance with the increase in litterfall, while the inorganic labile-P fraction decreased in relation to the organic labile-P fraction up to 48%, indicating a decrease in microbial activity. Thus, after just three years of slight drought, a clear trend towards an accumulation of P in the soil and towards a decrease of P in the stand biomass was observed. The P accumulation in the soil in the drought plots was mainly in forms that were not directly available to plants. These indirect effects of drought including the decrease in plant P availability, may become a serious constraint for plant growth and therefore may have a serious effect on ecosystem performance.

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“…The low N concentration found in streamwater suggests that these ecosystems are still far from N saturation since most of the deposited N is still retained within the ecosystem (Àvila and Rodà, 2012;Bernal et al, 2013). Estimated N amounts annually stored in Holm oak above ground biomass are in the range of the N wet deposition occurring in this area (Escarré et al, 1999). However, other effects of N deposition could be already occurring before N saturation (Emmet, 2007) and need further investigation.…”

Section: Moreover Other High-altitude Vegetation Types Like Pinus Unmentioning

confidence: 95%

Atmospheric concentration and deposition of reactive nitrogen in Spanish forests of Quercus ilex

Gómez¹

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A mi familia.A Tamara."El investigador puede superar todos los peligros que sus debilidades personales le planteen. Puede conservar el entusiasmo de la juventud, que le empujó a contemplar los misterios del universo. Puede seguir dando gracias por el extraordinario privilegio de participar en su exploración. Puede sentir un gozo constante por los descubrimientos hechos por otros, tanto en el pasado como en su propia época. Y puede aprender la difícil lección de que el viaje mismo, y no sólo la gran conquista, da plenitud a la vida humana" Stern, C. (1965) AGRADECIMIENTOS / ACKOWLEDGEMENTS Acknowledgements XI Gracias / thanksa mis padres Mercedes y Antonio. Gracias por el amor, la educación, el apoyo y comprensión (y por las becas para investigación, sin las cuales no habría llegado hasta aquí). Cuántas veces en los últimos meses de escritura he pensado en el camino recorrido desde los cuadernos de Segovia (resolviendo problemas con papá o escribiendo cuentos con mamá) a los cuadernos de la tesis en los que sigo resolviendo y escribiendo.a mi hermana Irene por su paciencia conmigo y su cariño, por ser una luchadora y por cuidar de todos nosotros. A mi hermano Óscar, por su ejemplo, su laboriosidad y su pasión por la ciencia (y la ficción).a mis sobrinos Alba y Ángel. Espero que crezcan en la fascinación por descubrir.a mi abuelo, que es un artista y un entusiasta.a mis amigos, con los que recorrí todos los primeros pasos.a Luis, José Vicente y Benjamín, que vieron en mí el potencial científico. Gracias por darme la oportunidad de entrar en la Ciencia (no os guardo rencor por meterme en esto, lo juro).a todos los jóvenes científicos con los que crucé mis pasos en los comienzos de esta aventura. A Laura y Javi Arañas, a Inés y Teresa, a Nùria, Biel y tantos otros limnólogos, a Sergio y María José... Gracias a todos por vuestro entusiasmo contagioso.a mi familia victoriana. Gracias Ruth, José, Alberto y Oriol por haber sido un oasis en medio de este invivible pero insustituible Madrid, y por seguir siendo parte de mi vida.a mi familia ciemeña. Gracias Javi, Susana, Viki, Isaura, Fernando, Carla, Nacho, Héctor, Rocío... por seis años de compañerismo, por las risas y por compartir las alegrías y los padecimientos de seguir haciendo ciencia.a todos los trabajadores y trabajadoras de los organismos públicos españoles que siguen obstinados en que se exprima todo el potencial científico que tiene nuestro país, a pesar de las dificultades. Gracias especialmente a los trabajadores de la Biblioteca y a los técnicos del Dpto. Gracias a todos los españoles que pagan sus impuestos y especialmente a los que confían en el potencial de nuestros jóvenes investigadores. RESUMEN Resumen XVII ResumenEl depósito atmosférico de nitrógeno (N) es considerado la tercera causa más importante de pérdida de biodiversidad, tras los cambios de uso del suelo y el cambio climático. La cuenca mediterránea presenta una extraordinaria riqueza biológica y se reconoce como uno de los 25 puntos de conservación prioritaria de la diversidad biológica m...

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Nutrient Distribution and Cycling

Cited by 11 publications

References 17 publications

Coupling N Cycling and N Productivity in Relation to Seasonal Stress in Quercus Pyrenaica Willd. Saplings

Coupling N Cycling and N Productivity in Relation to Seasonal Stress in Quercus Pyrenaica Willd. Saplings

Increasing drought decreases phosphorus availability in an evergreen Mediterranean forest

Atmospheric concentration and deposition of reactive nitrogen in Spanish forests of Quercus ilex

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