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Tree growth response to drought partially explains regional-scale growth and mortality patterns in Iberian forests
ID
Gazol, Antonio
(
Author
),
ID
Camarero, Jesus Julio
(
Author
),
ID
Sánchez-Salguero, Raúl
(
Author
),
ID
Zavala, Miguel A.
(
Author
),
ID
Serra-Maluquer, Xavier
(
Author
),
ID
Gutiérrez, Emilia
(
Author
),
ID
De Luis, Martin
(
Author
),
ID
Sangüesa-Barreda, Gabriel
(
Author
),
ID
Novak, Klemen
(
Author
),
ID
Rozas, Vicente
(
Author
)
URL - Source URL, Visit
https://esajournals.onlinelibrary.wiley.com/doi/10.1002/eap.2589
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Abstract
Tree-ring data has been widely used to inform about tree growth responses to drought at the individual scale, but less is known about how tree growth sensitivity to drought scales up driving changes in forest dynamics. Here, we related tree-ring growth chronologies and stand-level forest changes in basal area from two independent datasets to test if tree-ring responses to drought match stand forest dynamics (stand basal area growth, ingrowth and mortality). We assessed if tree growth and changes in forest basal area covary as a function of spatial scale and tree taxa (gymnosperm or angiosperm). To this end, we compared a tree-ring network with stand data from the Spanish National Forest Inventory. We focused on the cumulative impact of drought on tree growth and demography in the period 1981-2005. Drought years were identified by the Standardized Precipitation Evapotranspiration Index (SPEI), and their impacts on tree growth by quantifying tree-ring width reductions. We hypothesized that forests with greater drought impacts on tree growth will also show reduced stand basal area growth and ingrowth and enhanced mortality. This is expected to occur in forests dominated by gymnosperms on drought-prone regions. Cumulative growth reductions during dry years were higher in forests dominated by gymnosperms and presented a greater magnitude and spatial autocorrelation than for angiosperms. Cumulative drought-induced tree growth reductions and changes in forest basal area were related, but initial stand density and basal area were the main factors driving changes in basal area. In drought-prone gymnosperm forests we observed that sites with greater growth reductions had lower stand basal area growth and greater mortality. Consequently, stand basal area, forest growth and ingrowth in regions with large drought impacts was significantly lower than in regions less impacted by drought. Tree growth sensitivity to drought can be used as a predictor of gymnosperm demographic rates in terms of stand basal area growth and ingrowth at regional scales, but further studies may try to disentangle how initial stand density modulates such relationships. Drought-induced growth reductions and their cumulative impacts have strong potential to be used as early-warning indicators of regional forest vulnerability.
Language:
English
Keywords:
basal area increment
,
drought vulnerability
,
stand structure
,
tree growth
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
BF - Biotechnical Faculty
Publication status:
Published
Publication version:
Version of Record
Publication date:
25.03.2022
Year:
2022
Number of pages:
1 spletni vir (1 datoteka PDF (17 str.))
Numbering:
Vol. 32, iss. 5
PID:
20.500.12556/RUL-138062
UDC:
630*8
ISSN on article:
1939-5582
DOI:
10.1002/eap.2589
COBISS.SI-ID:
106776579
Publication date in RUL:
08.07.2022
Views:
611
Downloads:
56
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Record is a part of a journal
Title:
Ecological applications
Shortened title:
Ecol. appl.
Publisher:
Ecological Society of America, Wiley
ISSN:
1939-5582
COBISS.SI-ID:
4294310
Secondary language
Language:
Slovenian
Keywords:
temeljnični prirastek
,
občutljivost na sušo
,
struktura sestoja
,
rast dreves
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