Acorn production is linked to secondary growth but not to declining carbohydrate concentrations in current-year shoots of two oak species

Alla, Arben Q.; Camarero, J. Julio; Maestro-Martı́nez, M.; Montserrat-Martı́, Gabriel

doi:10.1007/s00468-011-0658-3

Cited by 25 publications

(24 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This minimum EVI value is in line with many studies reporting a relevant role of the conditions of the previous years (e.g. canopy growth, bud development, and temperatures) to account for a future masting episode (Alla et al 2011, Sánchez-Humanes et al 2011, Kelly et al 2013. Moreover, the negative autocorrelation coefficients among consecutive acorn crops (Table 1, lags 1, 3, and 4) also support the premise that large crop sizes are driven by endogenous cycles of resource accumulation-depletion.…”

Section: Short-time Resource Accumulation and Mastingsupporting

confidence: 88%

Temporal trends in the enhanced vegetation index and spring weather predict seed production in Mediterranean oaks

et al. 2015

View full text Add to dashboard Cite

The extremely year-to-year variable production of seeds (masting) is an extended plant reproductive behaviour important for forest dynamics and food webs. The dependence of these episodes of massive seed production on recently or long-term photosynthesised carbohydrates, however, remains controversial. In this paper, we explore whether vegetation (tree canopy) changes, detected using EVI as a proxy of leaf area and photosynthetic capacity, can provide a reliable estimation of seed production. To complete this analysis, we also explored the effect of weather both in the trends of EVI and in acorn crop size. To this end, we compared the trends of the EVI and acorn production over 10 years (2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009) in five stands of Quercus ilex L. in Barcelona (Catalonia, NE Spain). We found that acorn production was mainly driven by a combination of: (i) a minimum initial threshold in the EVI values, (ii) an increase in EVI in the 9 ± 4 months prior to reproduction, and (iii) appropriate weather conditions (low water stress) during spring. These results indicated, apparently for the first time, that reproduction in masting species could be detected and partly predicted by remotely sensed vegetative indices. Our results suggested that this particular reproductive behaviour in Mediterranean oaks was driven by a combination of two factors, i.e. good and improving vegetation conditions, as shown by a minimum initial threshold and the increase in EVI needed for large seed crops, and the need of wet weather conditions during spring. Moreover, our results fully supported recent studies that have associated short-term photosynthate production with seed production.

show abstract

Section: Short-time Resource Accumulation and Mastingsupporting

confidence: 88%

Temporal trends in the enhanced vegetation index and spring weather predict seed production in Mediterranean oaks

et al. 2015

View full text Add to dashboard Cite

show abstract

“…All MCMC analyses 60 were run yielding in every case a total of 1,000 data points for each analysis and 61 ensuring autocorrelations below 0. Alla et al, 2011;Sala et al, 2012;Barringer et al, 2013;Żywiec & Zielonka, 2013) and a 50 review helping to define mechanistic links between both functions.…”

Section: Appendixmentioning

confidence: 99%

Ecología evolutiva de la reproducción en dos pinos mediterráneos: Pinus pinaster Ait. y Pinus halepensis Mill.

Blanco¹

2014

ECOS

View full text Add to dashboard Cite

“…Deciduous forest trees have very efficient mechanisms of internal translocation of N during a growing season (Yasumura et al 2002;Cantón et al 2005;Millard and Grelet 2010;Ueda et al 2011). The triggers for N translocation are often related to the formation of secondary shoots (Ueda et al 2009) and fruit development (Han et al 2008(Han et al , 2011Alla et al 2012). For example, N is usually translocated during a growing season from older leaves (developed in spring) to newly formed leaves (Ueda et al 2009), which can occur on successive flushes of shoots during the summer in response to favorable environmental conditions (Kozlowski and Pallardy 2008;Kuster et al 2014), and/or to fruits that are developing and maturing during the summer (Han et al 2011;Alla et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Estimation of leaf nitrogen concentrations in Quercus robur L. using the CCM-200 portable chlorophyll meter for different patterns of vegetative growth and acorn production

et al. 2016

View full text Add to dashboard Cite

The potential of the CCM-200 chlorophyll meter for providing accurate estimates of total nitrogen concentrations was studied from 2009 to 2011 using pedunculate oak (Quercus robur L.) leaves collected in a field trial near Zagreb, Croatia. A fertilization treatment carried out in early spring 2009 and in variable weather conditions caused between-year differences in acorn yield and production of second and third flush shoots. A total of 10 linear calibration equations were constructed based on data from leaves sampled in early July (first flush leaves), in mid-August (second flush leaves) and in mid-September (first and second flush leaves). These equations reliably described (p \ 0.001) the relationships between chlorophyll content index values (CCI) measured by the chlorophyll meter and leaf nitrogen concentration (LNC) with respect to the year and month of sampling. The results suggest that variable seasonal dynamics of LNC are influenced by second and/or third flushes as well as by acorn yield. This finding has negative consequences for applying the chlorophyll meter as a suitable tool for LNC assessments during a growing season or over several growing seasons. However, the chlorophyll meter still proved to be a potentially useful tool for LNC estimations, but only when calibration equations were constructed based on the first flush leaves sampled in mid-September (in the last third of a growing season).

show abstract

Acorn production is linked to secondary growth but not to declining carbohydrate concentrations in current-year shoots of two oak species

Cited by 25 publications

References 50 publications

Temporal trends in the enhanced vegetation index and spring weather predict seed production in Mediterranean oaks

Temporal trends in the enhanced vegetation index and spring weather predict seed production in Mediterranean oaks

Ecología evolutiva de la reproducción en dos pinos mediterráneos: Pinus pinaster Ait. y Pinus halepensis Mill.

Estimation of leaf nitrogen concentrations in Quercus robur L. using the CCM-200 portable chlorophyll meter for different patterns of vegetative growth and acorn production

Contact Info

Product

Resources

About