Species-specific weather response in the daily stem variation cycles of Mediterranean pine-oak mixed stands

Abstract

Please cite this article as: Aldea, J., Bravo, F., Vázquez-Piqué, J., Rubio-Cuadrado, A., del Río, M., 2018. Species-specific weather response in the daily stem variation cycles of Mediterranean pine-oak mixed stands. Agric. For. [220][221][222][223][224][225][226][227][228][229][230] This is a PDF file of an unedited manuscript (post-print version) that has been accepted for publication . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 15Corresponding author: Aldea, J. email: jorge.aldea@uva.es 16 Title page Highlights: Maximum daily radial variation for pine occurred in spring, but in summer for oak  Number of spring daily cycles with radial increment was higher for pine than oak  Species responded differently to air temperature according daily radial variation  Rain increased daily radial variation and cycle duration in both species  Water availability limited daily radial increment for both species 15Corresponding author: Aldea, J. email: jorge.aldea@uva.es 16 Abstract 17Climate change forecasts are particularly severe for the western Mediterranean Basin, 18 where rising temperatures and decreased precipitation could increase the frequency of 19 drought events. Understanding the specific weather drivers of radial variation in 20Mediterranean mixed forest stands will allow us to better predict the ecological and 21 production alterations that may result from climate change. Here, we studied species 22 differences in stem daily radial variation cycles and daily radial increment of 23Mediterranean pine-oak (Pinus pinaster-Quercus pyrenaica) mixed stands over three 24 *Manuscript Click here to view linked References climatically contrasted years (2012)(2013)(2014) at two sites with dissimilar drought 25 conditions. Our aim was to uncover differences in the weather drivers of daily radial 26 variation for the two co-existing species. High-resolution point dendrometers were 27 installed in dominant oak and pine trees, so that daily radial variation cycles were 28 analyzed. Linear mixed models were fitted to analyze species-specific response to 29 weather. Air temperature leads to radial stem-size changes in daily variation cycles with 30 different species responses. Precipitation increased daily radial variation and cycle 31 duration in the same way for both species. Daily radial increment and number of cycles 32 with increment phase during spring was mostly higher for pine than oak, and water 33 availability was the most important control factor for the phase mentioned. Differences 34 in species response to weather conditions may offset the usual low production of pure 35 oak coppice Mediterranean stands and highlight the role of mixed forests as a possible 36 adaptation strategy for climate change. 37 Highlights: 38 Maximum daily radial variation for pine occurred in spring, but in summer for 39 oak 40  Nu...

Drought responses and their effects on radial stem growth of two co-occurring conifer species in the Mediterranean mountain range

“…The Mediterranean climate with a distinct heat and drought period inhibits growth in the summer (Fig. 2) usually leading to the well-described bimodal growth pattern with peaks before and after this period (Aldea et al 2018;Camarero et al 2010;Vieira et al 2014). In this study, the trees of both species grew before and after the dry period (Fig.…”

“…Since the reversible processes are mainly determined by water transport dynamics within the tree, stem shrinkage and swelling dynamics can be used to quantify drought stress (Aldea et al 2018;Vieira et al 2013;, canopy water status (Dietrich et al 2018;Van Emmerik et al 2017), plant hydraulics (Daudet et al 2005;Ehrenberger et al 2012), and even osmoregulation (Barraclough et al 2019;Lazzarin et al 2018). There are two variables we focus on: the tree water deficit-induced stem shrinkage called tree water deficit (TWD) (Zweifel et al 2016) and the maximum daily shrinkage (MDS).…”

Combining Dendrometer Series and Xylogenesis Imagery—DevX, a Simple Visualization Tool to Explore Plant Secondary Growth Phenology

“…The most common approaches to study seasonal tree growth dynamics and wood formation phenology include the monitoring of stem-size variation (dendrometers), repeated wounding of the cambium through the pinning technique (e.g., Gričar et al, 2007) and repeated cambium sampling through microcores (e.g., Mäkinen et al, 2008;Drew and Downes, 2009;Prislan et al, 2013;Balzano et al, 2018). Among these approaches, the use of point-dendrometers has been shown to be an effective technique for recording intra-annual tree growth variability and attempts have been made to link radial variations to meteorological conditions by disentangling hydraulic stemdiameter fluctuations and biomass increments (Deslauriers et al, 2007;van der Maaten et al, 2013van der Maaten et al, , 2018Aldea et al, 2018). Although the use of daily stem variation data seems to be promising for understanding the ecology of radial growth on a fine temporal scale, its use on determining (absolute) wood formation phenology is limited, since changes in stem water content can potentially mask signals from actual cellular production (Cuny et al, 2015;Sass-Klaassen, 2015).…”

Mixed stands growth dynamics of Scots pine and Maritime pine: species complementarity relationships and growth effects

“…However, species interactions can be altered intraand inter-annually by temporal changes in climatic conditions and resource availability (Forrester, 2014). Intra-annual patterns define the species-specific timing and magnitude of growth rhythms, which can provide insight into climate impacts on tree physiology and growth processes (Aldea et al, 2018;de-Dios-García et al, 2015;Rossi et al, 2012;Swidrak et al, 2013). For their part, interannual fluctuations in tree ring measurements in response to climate variability and specific disturbances (del Río et al, 2014b; are especially interesting for looking at productivity stability over time (del Río et al, 2017;Jucker et al, 2014a).…”

“…Some degree of niche partitioning is required for coexisting species and can be reflected in crown characteristics, vertical leaf profiles, shade tolerance or differences in growth phenology (Aldea et al, 2018;Jucker et al, 2015;Toïgo et al, 2017). Nonetheless, small differences in species structural traits can trigger positive interspecific effects through complementarity or competition reduction mechanisms (Jucker et al, 2014b).…”