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Title

Seasonal hysteresis of net ecosystem exchange in response to temperature change: patterns and causes

Publication Year

2011

Author(s)
  • Niu, Shuli
  • Luo, Yiqi
  • Fei, Shenfeng
  • Montagnani, Leonardo
  • Bohrer, Gil
  • Janssens, Ivan A.
  • Gielen, Bert
  • Rambal, Serge
  • Moors, Eddy
  • Matteucci, Giorgio
Source
GLOBAL CHANGE BIOLOGY Volume: 17 Issue: 10 Pages: 3102-3114 Published: 2011
ISSN
1354-1013
Abstract

Understanding how net ecosystem exchange (NEE) changes with temperature is central to the debate on climate change-carbon cycle feedbacks, but still remains unclear. Here, we used eddy covariance measurements of NEE from 20 FLUXNET sites (203 site-years of data) in mid-and high-latitude forests to investigate the temperature response of NEE. Years were divided into two half thermal years (increasing temperature in spring and decreasing temperature in autumn) using the maximum daily mean temperature. We observed a parabolic-like pattern of NEE in response to temperature change in both the spring and autumn half thermal years. However, at similar temperatures, NEE was considerably depressed during the decreasing temperature season as compared with the increasing temperature season, inducing a counter-clockwise hysteresis pattern in the NEE-temperature relation at most sites. The magnitude of this hysteresis was attributable mostly (68%) to gross primary production (GPP) differences but little (8%) to ecosystem respiration (ER) differences between the two half thermal years. The main environmental factors contributing to the hysteresis responses of NEE and GPP were daily accumulated radiation. Soil water content (SWC) also contributed to the hysteresis response of GPP but only at some sites. Shorter day length, lower light intensity, lower SWC and reduced photosynthetic capacity may all have contributed to the depressed GPP and net carbon uptake during the decreasing temperature seasons. The resultant hysteresis loop is an important indicator of the existence of limiting factors. As such, the role of radiation, LAI and SWC should be considered when modeling the dynamics of carbon cycling in response to temperature change.

Author Keyword(s)
  • carbon cycle
  • climate change
  • day length
  • ecosystem respiration
  • gross ecosystem productivity
  • leaf area index
  • seasonal variation
  • temperature sensitivity
KeyWord(s) Plus
  • CARBON-DIOXIDE EXCHANGE
  • SCOTS PINE FOREST
  • SUB-ALPINE FOREST
  • SOIL RESPIRATION
  • DECIDUOUS FOREST
  • SOLAR-RADIATION
  • BOREAL FOREST
  • CO2 EXCHANGE
  • BEECH FOREST
  • SOUTHERN FINLAND
ESI Discipline(s)
  • Environment/Ecology
Web of Science Category(ies)
  • Biodiversity Conservation
  • Ecology
  • Environmental Sciences
Adress(es)

[Niu, Shuli; Luo, Yiqi; Fei, Shenfeng] Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USA; [Niu, Shuli] Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China; [Montagnani, Leonardo] Prov Autonoma Bolzano, Serv Forestali, Agenzia Ambiente, I-39100 Bolzano, Italy; [Montagnani, Leonardo] Free Univ Bozen Bolzano, Fac Sci & Technol, I-39100 Bolzano, Italy; [Bohrer, Gil] Ohio State Univ, Dept Civil & Environ Engn & Geodet Sci, Columbus, OH 43210 USA; [Janssens, Ivan A.; Gielen, Bert] Univ Antwerp, Dept Biol, B-2610 Antwerp, Belgium; [Rambal, Serge] CNRS, CEFE, DREAM, UMR5175, F-34293 Montpellier 5, France; [Moors, Eddy] Wageningen UR, ESS CC, NL-6700 AA Wageningen, Netherlands; [Matteucci, Giorgio] Inst Agroenvironm & Forest Biol, Nat Res Council, I-00015 Monterotondo, RM, Italy

Reprint Adress

Niu, SL (reprint author), Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USA.

Country(ies)
  • Belgium
  • France
  • Italy
  • Netherlands
  • People's Republic of China
  • United States
CNRS - Adress(es)
  • Centre d'Ecologie Fonctionnelle et Evolutive (CEFE), UMR5175
Accession Number
WOS:000294571700008
uid:/CXQBH1XV
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