Open AccessChange in the Green-Up Dates for Quercus mongolica in Northeast China and Its Climate-Driven Mechanism from 1962 to 2012
Author(s) -
Deng-Ping Fan,
Wenquan Zhu,
Zhoutao Zheng,
Donghai Zhang,
Yaozhong Pan,
Nan Jiang,
Xinyu Zhou
Publication year - 2015
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0130516
Subject(s) - phenology , china , climate change , climatology , environmental science , forcing (mathematics) , geography , global warming , physical geography , ecology , biology , geology , archaeology
The currently available studies on the green-up date were mainly based on ground observations and/or satellite data, and few model simulations integrated with wide coverage satellite data have been reported at large scale over a long time period (i.e., > 30 years). In this study, we combined phenology mechanism model, long-term climate data and synoptic scale remote sensing data to investigate the change in the green-up dates for Quercus mongolica over 33 weather stations in Northeast China and its climate-driven mechanism during 1962-2012. The results indicated that the unified phenology model can be well parameterized with the satellite derived green-up dates. The optimal daily mean temperature for chilling effect was between -27°C and 1°C for Q . mongolica in Northeast China, while the optimal daily mean temperature for forcing effect was above -3°C. The green-up dates for Q . mongolica across Northeast China showed a delayed latitudinal gradient of 2.699 days degree -1 , with the earliest date on the Julian day 93 (i.e., 3 th April) in the south and the latest date on the Julian day 129 (i.e., 9 th May) in the north. The green-up date for Q . mongolica in Northeast China has advanced 6.6 days (1.3 days decade -1 ) from 1962 to 2012. With the prevailing warming in autumn, winter and spring in Northeast China during the past 51 years, the chilling effect for Q . mongolica has been weakened, while the forcing effect has been enhanced. The advancing trend in the green-up dates for Q . mongolica implied that the enhanced forcing effect to accelerate green-up was stronger than the weakened chilling effect to hold back green-up while the changes of both effects were caused by the warming climate.