Leaf development and demography explain photosynthetic seasonality in Amazon evergreen forests

Author:

Wu Jin1,Albert Loren P.1,Lopes Aline P.2,Restrepo-Coupe Natalia13,Hayek Matthew4,Wiedemann Kenia T.14,Guan Kaiyu56,Stark Scott C.7,Christoffersen Bradley18,Prohaska Neill1,Tavares Julia V.2,Marostica Suelen2,Kobayashi Hideki9,Ferreira Mauricio L.1011,Campos Kleber Silva12,da Silva Rodrigo12,Brando Paulo M.1314,Dye Dennis G.15,Huxman Travis E.16,Huete Alfredo R.3,Nelson Bruce W.2,Saleska Scott R.1

Affiliation:

1. Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721, USA.

2. Brazil’s National Institute for Amazon Research (INPA), Manaus, Amazonas, Brazil.

3. Plant Functional Biology and Climate Change Cluster, University of Technology Sydney, Sydney, NSW, Australia.

4. John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.

5. Department of Natural Resources and Environmental Science, University of Illinois at Urbana Champaign, Urbana, IL 61081, USA.

6. Department of Earth System Science, Stanford University, Stanford, CA 94025, USA.

7. Department of Forestry, Michigan State University, East Lansing, MI 48824, USA.

8. Earth and Environmental Sciences Division, Los Alamos National Lab, Los Alamos, NM 87545, USA.

9. Department of Environmental Geochemical Cycle Research, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan.

10. Centro de Energia Nuclear na Agricultura, University of Sao Paulo, Piracicaba, SP, Brazil.

11. Smart and Intelligent Cities Programme, University Nove de Julho, São Paulo, SP, Brazil.

12. Department of Environmental Physics, University of Western Para (UFOPA), Santarem, Para, Brazil.

13. Instituto de Pesquisa Ambiental da Amazônia (IPAM), Belem, Para, Brazil.

14. Woods Hole Research Center, Falmouth, MA 02450, USA.

15. Western Geographic Science Center, U.S. Geological Survey, Flagstaff, AZ 86001, USA.

16. Ecology and Evolutionary Biology and Center for Environmental Biology, University of California, Irvine, CA 92629, USA.

Abstract

Leaf seasonality in Amazon forests Models assume that lower precipitation in tropical forests means less plant-available water and less photosynthesis. Direct measurements in the Amazon, however, show that production remains constant or increases in the dry season. To investigate this mismatch, Wu et al. use tower-based cameras to detect the phenology (i.e., the seasonal patterns) of leaf dynamics in tropical tree crowns in Amazonia, Brazil, and relate this to patterns of CO 2 flux. Accounting for age-dependent variation among individual leaves and crowns is necessary for understanding the seasonal dynamics of photosynthesis in the entire ecosystem. Leaf phenology regulates seasonality of the carbon flux in tropical forests across a gradient of climate zones. Science , this issue p. 972

Funder

NSF PIRE

NASA Terra-Aqua Science program

U.S. Department of Energy

Max Planck Society

INPA

Amazonas State University

Amazonas State Government

German Federal Ministry of Education and Research

Brazilian Ministry of Science Technology and Innovation

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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