Stand dynamics modulate water cycling and mortality risk in droughted tropical forest

Autor: Maurizio Mencuccini, Patrick Meir, Oliver Binks, Rafael S. Oliveira, João de Athaydes Silva Junior, Yann Salmon, Lucy Rowland, Antonio Carlos Lola da Costa, Alex A. R. Oliveira, Leandro Valle Ferreira, Rafael Poyatos, Steel Silva Vasconcelos
Přispěvatelé: Ecosystem processes (INAR Forest Sciences), Department of Physics, Micrometeorology and biogeochemical cycles, Viikki Plant Science Centre (ViPS)
Rok vydání: 2017
Předmět:
FLUX
tropical forest
0106 biological sciences
Rainforest
010504 meteorology & atmospheric sciences
REGIONAL CLIMATE
Climate Change
Climate change
drought
114 Physical sciences
01 natural sciences
Soil
Water Cycle
sap flux
SOIL-MOISTURE DEFICIT
Environmental Chemistry
AMAZONIAN RAIN-FOREST
Precipitation
1172 Environmental sciences
1183 Plant biology
microbiology
virology
0105 earth and related environmental sciences
General Environmental Science
Transpiration
Tropical Climate
Global and Planetary Change
CLIMATE-CHANGE
Ecology
Agroforestry
Amazon rainforest
Water
TRANSPIRATION
food and beverages
Tropics
water cycling
15. Life on land
Droughts
SEASONALITY
HYDRAULICS
Agronomy
13. Climate action
tree mortality
TREES
Environmental science
Cycling
drought
sap flux
transpiration
tree mortality
tropical forest
water cycling
RESPONSES
010606 plant biology & botany
Woody plant
Zdroj: Global Change Biology. 24:249-258
ISSN: 1365-2486
1354-1013
Popis: Transpiration from the Amazon rainforest generates an essential water source at a global and local scale. However, changes in rainforest function with climate change can disrupt this process, causing significant reductions in precipitation across Amazonia, and potentially at a global scale. We report the only study of forest transpiration following a long-term (>10 year) experimental drought treatment in Amazonian forest. After 15 years of receiving half the normal rainfall, drought-related tree mortality caused total forest transpiration to decrease by 30%. However, the surviving droughted trees maintained or increased transpiration because of reduced competition for water and increased light availability, which is consistent with increased growth rates. Consequently, the amount of water supplied as rainfall reaching the soil and directly recycled as transpiration increased to 100%. This value was 25% greater than for adjacent non-droughted forest. If these drought conditions were accompanied by a modest increase in temperature (e.g. 1.5°C), water demand would exceed supply, making the forest more prone to increased tree mortality. This article is protected by copyright. All rights reserved.
Databáze: OpenAIRE
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