Ecosystems

, Volume 17, Issue 7, pp 1186–1201

Partitioning Climatic and Biotic Effects on Interannual Variability of Ecosystem Carbon Exchange in Three Ecosystems

  • Junjiong Shao
  • Xuhui Zhou
  • Honglin He
  • Guirui Yu
  • Huimin Wang
  • Yiqi Luo
  • Jiakuan Chen
  • Lianhong Gu
  • Bo Li
Article

DOI: 10.1007/s10021-014-9786-0

Cite this article as:
Shao, J., Zhou, X., He, H. et al. Ecosystems (2014) 17: 1186. doi:10.1007/s10021-014-9786-0

Abstract

Understanding the climatic and biotic controls of interannual variability (IAV) in net ecosystem exchange (NEE) is important for projecting future uptake of CO2 in terrestrial ecosystems. In this study, a statistical modeling approach was used to partition climatic and biotic effects on the IAV in NEE, gross primary productivity (GPP) and ecosystem respiration (RE) at a subtropical evergreen plantation in China (QYZ), a deciduous forest (MOZ), and a grassland (DK1) in the USA. The climatic effects in the study are defined as the interannual anomalies in carbon (C) fluxes directly caused by climatic variations, whereas the biotic effects are those caused by the IAV in photosynthetic and respiratory traits. The results showed that the contribution of biotic effects to the IAV in NEE increased significantly as the temporal scale got longer from daily to annual scales. At the annual scale, the contribution of biotic effects to the IAV in NEE was 47, 69, and 77% at QYZ, MOZ, and DK1, respectively. However, the IAV in NEE was mainly controlled by GPP at QYZ, and by RE at DK1, whereas the contributions of GPP and RE to the IAV in NEE were similar at MOZ, indicating different mechanisms regulating the IAV in NEE among ecosystems. Interestingly, there was a strong negative correlation between the climatic and biotic effects at the annual scale from 2003 to 2009 at QYZ (r2 = 0.80, P < 0.01), suggesting these two effects counteracted each other and resulted in a relatively stable C sink, whereas no correlations were found at the other two sites. Overall, our study revealed the relative importance of climatic and biotic effects on the IAV in NEE and contributed to our understanding of their underlying mechanisms.

Keywords

biotic effectsclimatic effectseddy covarianceinterannual variabilitynet ecosystem exchangerelative contribution

Supplementary material

10021_2014_9786_MOESM1_ESM.docx (938 kb)
Supplementary material 1 (DOCX 937 kb)

Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Junjiong Shao
    • 1
    • 2
  • Xuhui Zhou
    • 1
  • Honglin He
    • 2
  • Guirui Yu
    • 2
  • Huimin Wang
    • 2
  • Yiqi Luo
    • 1
    • 3
  • Jiakuan Chen
    • 1
  • Lianhong Gu
    • 4
  • Bo Li
    • 1
  1. 1.Coastal Ecosystems Research Station of Yangtze River Estuary, Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity ScienceFudan UniversityShanghaiChina
  2. 2.Institute of Geographical Sciences and Natural Resource ResearchChinese Academy of SciencesBeijingChina
  3. 3.Department of Microbiology and Plant BiologyUniversity of OklahomaNormanUSA
  4. 4.Oak Ridge National LaboratoryOak RidgeUSA