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Chinese Journal of Applied Ecology ›› 2021, Vol. 32 ›› Issue (10): 3557-3566.doi: 10.13287/j.1001-9332.202110.016

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Responses of radial growth of Pinus yunnanensis to climatic and hydrological factors at different altitudes in Western Yunnan, China

WANG Shi-jie1, CHEN You-ping1, CHEN Feng1,2*, ZHANG He-li1,2   

  1. 1Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security, Institute of International Rivers and Eco-security, Yunnan University, Kunming 650504, China;
    2Key Laboratory of Tree-ring Physical and Chemic Research of China Meteorological Administration/Key Laboratory of Tree-ring Ecology of Uigur Autonomous Region, Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China
  • Received:2021-04-13 Revised:2021-07-22 Online:2021-10-15 Published:2022-04-15
  • Contact: * E-mail: feng653@163.com
  • Supported by:
    National Natural Science Foundation of China (32061123008).

Abstract: A tree-ring width chronology (STD) was established using tree-ring cores of Pinus yunnanensis from two sites with different altitudes in Western Yunnan, to study the responses of radial growth to climatic and hydrological factors. The results showed that the radial growth of P. yunnanensis in Western Yunnan was mainly affected by precipitation, temperature and runoff. The radial growth of P. yunnanensis at high altitude (2413.3 m) was controlled primarily by high temperature in summer and runoff in the monsoon season. In contrast, the radial growth of P. yunnanensis at low altitude (1062.6 m) was mainly controlled by precipitation in the growing season and annual runoff. The responses of radial growth of P. yunnanensis at high altitude to temperature change was unstable due to the existence of the temperature threshold. Due to the weakening of the East Asian summer monsoon in the 1980s, the temporal stability of tree growth response at low altitude to precipitation and runoff fluctuated. The radial growth of P. yunnanensis at different altitudes in Western Yunnan was related to the Asian summer monsoon and El Nio-Southern Oscillation.

Key words: Pinus yunnanensis, altitude, radial growth, climate change