Journal
JOURNAL OF PLANT ECOLOGY
Volume 7, Issue 6, Pages 559-566Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jpe/rtt067
Keywords
climate change; cumulative degree days; experimental warming; leaf senescence; leaf unfolding
Categories
Funding
- National Research Foundation of Korea [2010-0014620]
- Korea Forest Service [S111112L030100]
- Korea University
- National Research Foundation of Korea [2010-0014620] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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An open-field warming experiment enables us to test the effects of projected temperature increase on change in plant phenology with fewer confounding factors and to study phenological response to temperature ranges beyond natural variability. This study aims to (i) examine the effect of temperature increase on leaf unfolding and senescence of oriental oak (Quercus variabilis Blume) under experimental warming and (ii) measure temperature-related parameters used in estimating phenological response to temperature elevation. Using an open-field warming system with infrared heaters, we increased the air temperature by similar to 3A degrees C in the warmed plots compared with that of the control plots consistently for 2 years. Leaf unfolding and senescence dates of Q. variabilis seedlings were recorded and temperature-related phenological parameters were analysed. The timing of leaf unfolding was advanced by 3-8 days (1.1-3.0 days/A degrees C) and the date of leaf senescence was delayed by 14-19 days (5.0-7.3 days/A degrees C) under elevated air temperatures. However, the cumulative degree days (CDD) of leaf unfolding were not significantly changed by experimental warming, which suggest the applicability of a constant CDD value to estimate the change in spring leaf phenology under 3A degrees C warming. Consistent ranges of advancement and temperature sensitivity in spring phenology and delayed autumn phenology and proposed temperature parameters from this study might be applied to predict future phenological change.
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