Chinese Science Bulletin

, Volume 59, Issue 34, pp 4856–4863 | Cite as

Effects of elevation on spring phenological sensitivity to temperature in Tibetan Plateau grasslands

  • Lingling Liu
  • Liangyun Liu
  • Liang Liang
  • Alison Donnelly
  • Isaac Park
  • Mark D. Schwartz
Article Geography

Abstract

Vegetation phenology is an important indicator of climate change impacts on the seasonal dynamics of the biosphere. However, little is known about the influence of elevation on spring phenological sensitivity to temperature in an alpine ecosystem. Based on remotely sensed land surface phenology and temperature data from 2001 to 2010, this study investigated the rate of spring phenological change of the Tibetan Plateau (TP) grasslands in response to interannual temperature variations at different elevations. Results suggest that spring phenology in the TP grasslands exhibits a stronger response to changes in temperature at higher elevations than at lower ones. In particular, spring phenology advanced by 1–2 days in response to a 1 °C increase in May average temperature at elevations from 3,000 to 3,500 m, while the rate was up to 8–9 days/°C at 5,000–5,500 m. Analysis using accumulated growing degree days (AGDD) from January 1 through May 31 showed the same general trend with increased elevation associated with increased sensitivity (as measured by phenological change per unit of AGDD change). Such temperature sensitivity gradients in the TP grasslands could be partly explained by the growth efficiency hypothesis which suggests that vegetation adapted to colder climates likely requires less heat energy for the onset of growing season and vice versa in warmer climates. Furthermore, accumulated growing degree days from January 1 to the greenup date were found to decrease with increasing elevations, which provided evidence to support the applicability of the growth efficiency hypothesis in an alpine grassland ecosystem.

Keywords

Temperature sensitivity Elevation Growth efficiency Land surface phenology Greenup Grasslands 

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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Lingling Liu
    • 1
    • 2
    • 4
  • Liangyun Liu
    • 1
  • Liang Liang
    • 3
  • Alison Donnelly
    • 4
  • Isaac Park
    • 4
  • Mark D. Schwartz
    • 4
  1. 1.Institute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijingChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.Department of GeographyUniversity of KentuckyLexingtonUSA
  4. 4.Department of GeographyUniversity of Wisconsin-MilwaukeeMilwaukeeUSA

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