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פותח על ידי קלירמאש פתרונות בע"מ -
A hidden mechanism of forest loss under climate change: The role of drought in eliminating forest regeneration at the edge of its distribution
Year:
2022
Source of publication :
Forest Ecology and Management
Authors :
אוסם, יגיל
;
.
Volume :
506
Co-Authors:

Ella Pozner
Peleg Bar-On
Stav Livne-Luzon
Uri Moran
Mor Tsamir-Rimon
Efrat Dener
Efrat Schwartz
Eyal Rotenberg
Fyodor Tatarinov
Yakir Preisler
Nitai Zecharia
Yagil Osem
Dan Yakir
Tamir Klein

Facilitators :
From page:
2022
To page:
0
(
Total pages:
-2021
)
Abstract:

The ongoing global warming and associated drying are shaping the fate of forests worldwide. While processes of tree mortality are visible and studied, a decrease in forest regeneration is mostly overlooked, although equally deleterious. Populations at the edge of tree species distribution areas are at higher risk and are hence hotspots for species extinctions.

Here we use a semi-arid pine forest growing at the timberline edge of forest existence as a model for forest survival under warming and drying conditions. Seedling recruitment, including seed germination, seedling survivorship, and multiyear seedling growth, were measured along six consecutive years. To pinpoint the role of drought, we designed a field experiment, manipulating stand density at three levels and grazing regimes.

Seed germination was high across all studied plots, but seedling survivorship and multiyear seedling growth were near-zero. Stand density and grazing exclusion positively affected germination. Seedling survivorship was higher in wetter years. Multiyear seedling growth was stunted by grazing, and seedling height was distributed differently across different stand densities.

Our data indicate that seedling survivorship during the first dry season acts as a bottleneck for forest existence at the dry and hot edge of current forest distribution. We also quantified the roles of other stressors such as shading, and highlighted the eliminating role of grazing on multiyear seedling growth. Forest regeneration should be more closely monitored in sensitive populations, as climate change-driven forest loss can happen even without mature tree mortality.

Note:
Related Files :
Forest thinning
Grazing
seedling growth
Seedling mortality
Seedling recruitment
Warming and drying
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.foreco.2021.119966
Article number:
11966
Affiliations:
Database:
גוגל סקולר
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
57612
Last updated date:
02/03/2022 17:27
Creation date:
12/01/2022 18:57
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Scientific Publication
A hidden mechanism of forest loss under climate change: The role of drought in eliminating forest regeneration at the edge of its distribution
506

Ella Pozner
Peleg Bar-On
Stav Livne-Luzon
Uri Moran
Mor Tsamir-Rimon
Efrat Dener
Efrat Schwartz
Eyal Rotenberg
Fyodor Tatarinov
Yakir Preisler
Nitai Zecharia
Yagil Osem
Dan Yakir
Tamir Klein

A hidden mechanism of forest loss under climate change: The role of drought in eliminating forest regeneration at the edge of its distribution

The ongoing global warming and associated drying are shaping the fate of forests worldwide. While processes of tree mortality are visible and studied, a decrease in forest regeneration is mostly overlooked, although equally deleterious. Populations at the edge of tree species distribution areas are at higher risk and are hence hotspots for species extinctions.

Here we use a semi-arid pine forest growing at the timberline edge of forest existence as a model for forest survival under warming and drying conditions. Seedling recruitment, including seed germination, seedling survivorship, and multiyear seedling growth, were measured along six consecutive years. To pinpoint the role of drought, we designed a field experiment, manipulating stand density at three levels and grazing regimes.

Seed germination was high across all studied plots, but seedling survivorship and multiyear seedling growth were near-zero. Stand density and grazing exclusion positively affected germination. Seedling survivorship was higher in wetter years. Multiyear seedling growth was stunted by grazing, and seedling height was distributed differently across different stand densities.

Our data indicate that seedling survivorship during the first dry season acts as a bottleneck for forest existence at the dry and hot edge of current forest distribution. We also quantified the roles of other stressors such as shading, and highlighted the eliminating role of grazing on multiyear seedling growth. Forest regeneration should be more closely monitored in sensitive populations, as climate change-driven forest loss can happen even without mature tree mortality.

Scientific Publication
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