Arthur Gessler1, Marcus Schaub1, Nate G McDowell2. 1. Swiss Federal Research Institute WSL, 8903, Birmensdorf, Switzerland. 2. Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.
Abstract
Contents 513 I. 513 II. 514 III. 517 518 References 518 SUMMARY: Global forests are experiencing rising temperatures and more severe droughts, with consistently dire forecasts for negative future impacts. Current research on the physiological mechanisms underlying drought impacts is focused on the water- and carbon-associated mechanisms. The role of nutrients is notably missing from this research agenda. Here, we investigate what role, if any, forest nutrition plays for survival and recovery of forests during and after drought. High nutrient availability may play a detrimental role in drought survival due to preferential biomass allocation aboveground that (1) predispose plants to hydraulic constraints limiting photosynthesis and promoting hydraulic failure, (2) increases carbon costs during periods of carbon starvation, and (3) promote biotic attack due to low tissue carbon: nitrogen (C : N). When nutrient uptake occurs during drought, high nutrient availability can increase water use efficiency thus minimizing negative feedbacks between carbon and nutrient balance. Nutrients are released after drought ceases, which might promote faster recovery but the temporal dynamics of microbial immobilization and nutrient leaching have a significant impact on nutrient availability. We provide a framework for understanding nutrient impacts on drought survival that allows a more complete analysis of forest ecosystem responses.
Contents 513 I. 513 II. 514 III. 517 518 References 518 SUMMARY: Global forests are experiencing rising temperatures and more severe droughts, with consistently dire forecasts for negative future impacts. Current research on the physiological mechanisms underlying drought impacts is focused on the water- and carbon-associated mechanisms. The role of nutrients is notably missing from this research agenda. Here, we investigate what role, if any, forest nutrition plays for survival and recovery of forests during and after drought. High nutrient availability may play a detrimental role in drought survival due to preferential biomass allocation aboveground that (1) predispose plants to hydraulic constraints limiting photosynthesis and promoting hydraulic failure, (2) increases carbon costs during periods of carbon starvation, and (3) promote biotic attack due to low tissue carbon: nitrogen (C : N). When nutrient uptake occurs during drought, high nutrient availability can increase water use efficiency thus minimizing negative feedbacks between carbon and nutrient balance. Nutrients are released after drought ceases, which might promote faster recovery but the temporal dynamics of microbial immobilization and nutrient leaching have a significant impact on nutrient availability. We provide a framework for understanding nutrient impacts on drought survival that allows a more complete analysis of forest ecosystem responses.
Authors: Hui Yang; Philippe Ciais; Jean-Pierre Wigneron; Jérôme Chave; Oliver Cartus; Xiuzhi Chen; Lei Fan; Julia K Green; Yuanyuan Huang; Emilie Joetzjer; Heather Kay; David Makowski; Fabienne Maignan; Maurizio Santoro; Shengli Tao; Liyang Liu; Yitong Yao Journal: Proc Natl Acad Sci U S A Date: 2022-06-22 Impact factor: 12.779
Authors: Arun K Bose; Arthur Gessler; Andreas Bolte; Alessandra Bottero; Allan Buras; Maxime Cailleret; J Julio Camarero; Matthias Haeni; Ana-Maria Hereş; Andrea Hevia; Mathieu Lévesque; Juan C Linares; Jordi Martinez-Vilalta; Luis Matías; Annette Menzel; Raúl Sánchez-Salguero; Matthias Saurer; Michel Vennetier; Daniel Ziche; Andreas Rigling Journal: Glob Chang Biol Date: 2020-06-08 Impact factor: 10.863