TY - JOUR
T1 - Blue is the fashion in Mediterranean pines
T2 - New drought signals from tree-ring density in southern Europe
AU - Akhmetzyanov, Linar
AU - Sánchez-Salguero, Raúl
AU - García-González, Ignacio
AU - Domínguez-Delmás, Marta
AU - Sass-Klaassen, Ute
N1 - Funding Information:
This research work is part of the ForSEAdiscovery project (Forest Resources for Iberian Empires: Ecology and Globalization in the Age of Discovery) and was funded by the Marie Curie Actions program of the European Union ( PITN-2013-GA-607545 ). LA is funded by the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No 101029581 , project “WoodTimes”. RSS is grateful to the projects LESENS ( RTI2018-096884-B-C33 ) and DendrOlavide I ( EQC2018-005303-P , Ministry of Science, Innovation and Universities, Spain), also thanks for the financial support from Andalusian government ( P20_00813 VUERCLIM ), ( IE19_074 UPO DendroOlavide ) and ( UPO-1263216 VULBOS ). MDD is supported by the Dutch Research Council ( NWO 016.Veni.195.502 ). We thank Fadi Hajj, Mohamed Traoré, Manuel Souto-Herrero and Peter Groenendijk for their great help in the field and in the lab.
Publisher Copyright:
© 2022 The Authors
PY - 2023/1/15
Y1 - 2023/1/15
N2 - Long-term records of tree-ring width (TRW), latewood maximum density (MXD) and blue intensity (BI) measurements on conifers have been largely used to develop high-resolution temperature reconstructions in cool temperate forests. However, the potential of latewood blue intensity (LWBI), less commonly used earlywood blue intensity (EWBI), and delta (difference between EWBI and LWBI, dBI) blue intensity in Mediterranean tree species is still unexplored. Here we developed BI chronologies in moist-elevation limits of the most southwestern European distribution of Pinus nigra subsp. salzmanii Arnold. We tested whether BI variables derived from tree rings of black pine are better proxies than ring-width variables to reconstruct long-term changes in climatic factors and water availability. For this we applied correlations and regression analyses with daily and monthly climate data, a spatial and temporal drought index (Standardized Precipitation-Evapotranspiration Index-SPEI) and Vapour Pressure Deficit (VPD), as well as atmospheric circulation patterns: North Atlantic Oscillation (NAO), Southern Oscillation Index (SOI) and Western Mediterranean Oscillation (WeMO). We found a positive relation between black pine growth (RW) and temperature during the winter preceding the growing season. Among all variables LWBI and dBI were found to be more sensitive than TRW to SPEI at low-elevation site, with EWBI series containing an opposite climatic signal. LWBI and dBI were significantly related to June and September precipitation at high-elevation site. Winter VPD was related with higher EWI and LWI series, whereas dBI and EWBI were related with January SOI and February NAO. We confirm the potential of long-term dBI series to reconstruct climate in drought-prone regions. This novel study in combination with other wood anatomical measurements has wide implications for further use of BI to understand and reconstruct environmental changes in Mediterranean conifer forests.
AB - Long-term records of tree-ring width (TRW), latewood maximum density (MXD) and blue intensity (BI) measurements on conifers have been largely used to develop high-resolution temperature reconstructions in cool temperate forests. However, the potential of latewood blue intensity (LWBI), less commonly used earlywood blue intensity (EWBI), and delta (difference between EWBI and LWBI, dBI) blue intensity in Mediterranean tree species is still unexplored. Here we developed BI chronologies in moist-elevation limits of the most southwestern European distribution of Pinus nigra subsp. salzmanii Arnold. We tested whether BI variables derived from tree rings of black pine are better proxies than ring-width variables to reconstruct long-term changes in climatic factors and water availability. For this we applied correlations and regression analyses with daily and monthly climate data, a spatial and temporal drought index (Standardized Precipitation-Evapotranspiration Index-SPEI) and Vapour Pressure Deficit (VPD), as well as atmospheric circulation patterns: North Atlantic Oscillation (NAO), Southern Oscillation Index (SOI) and Western Mediterranean Oscillation (WeMO). We found a positive relation between black pine growth (RW) and temperature during the winter preceding the growing season. Among all variables LWBI and dBI were found to be more sensitive than TRW to SPEI at low-elevation site, with EWBI series containing an opposite climatic signal. LWBI and dBI were significantly related to June and September precipitation at high-elevation site. Winter VPD was related with higher EWI and LWI series, whereas dBI and EWBI were related with January SOI and February NAO. We confirm the potential of long-term dBI series to reconstruct climate in drought-prone regions. This novel study in combination with other wood anatomical measurements has wide implications for further use of BI to understand and reconstruct environmental changes in Mediterranean conifer forests.
KW - Blue intensity
KW - Climate change
KW - Climatology
KW - Dendroecology
KW - Pinus nigra
KW - Tree-rings
KW - Dendrolab
U2 - 10.1016/j.scitotenv.2022.159291
DO - 10.1016/j.scitotenv.2022.159291
M3 - Article
C2 - 36208747
AN - SCOPUS:85139592314
SN - 0048-9697
VL - 856
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 159291
ER -
