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Observed air/soil temperature trends in open land and understory of a subtropical mountain forest, SW China

Authors

  • Guangyong You,

    1. Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan 666303, China
    2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
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  • Dr. Yiping Zhang,

    Corresponding author
    1. Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan 666303, China
    2. Ailaoshan Station for Subtropical Forest Ecosystem Studies, Chinese Ecosystem Research Network, Jingdong, Yunnan 676209 China
    3. National Forest Ecosystem Research Station at Ailaoshan, Jingdong, Yunnan 676209, China
    • Kunming Section, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, 88 Xuefu Road, Kunming, Yunnan 650223, China.
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  • Douglas Schaefer,

    1. Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan 666303, China
    2. Ailaoshan Station for Subtropical Forest Ecosystem Studies, Chinese Ecosystem Research Network, Jingdong, Yunnan 676209 China
    3. National Forest Ecosystem Research Station at Ailaoshan, Jingdong, Yunnan 676209, China
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  • Liqing Sha,

    1. Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan 666303, China
    2. Ailaoshan Station for Subtropical Forest Ecosystem Studies, Chinese Ecosystem Research Network, Jingdong, Yunnan 676209 China
    3. National Forest Ecosystem Research Station at Ailaoshan, Jingdong, Yunnan 676209, China
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  • Yuhong Liu,

    1. Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan 666303, China
    2. Ailaoshan Station for Subtropical Forest Ecosystem Studies, Chinese Ecosystem Research Network, Jingdong, Yunnan 676209 China
    3. National Forest Ecosystem Research Station at Ailaoshan, Jingdong, Yunnan 676209, China
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  • Hede Gong,

    1. Faculty of Ecotourism, Southwest Forestry University, Kunming 650224,China
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  • Zhenghong Tan,

    1. Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan 666303, China
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  • Zhiyun Lu,

    1. Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan 666303, China
    2. Ailaoshan Station for Subtropical Forest Ecosystem Studies, Chinese Ecosystem Research Network, Jingdong, Yunnan 676209 China
    3. National Forest Ecosystem Research Station at Ailaoshan, Jingdong, Yunnan 676209, China
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  • Chuansheng Wu,

    1. Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan 666303, China
    2. Ailaoshan Station for Subtropical Forest Ecosystem Studies, Chinese Ecosystem Research Network, Jingdong, Yunnan 676209 China
    3. National Forest Ecosystem Research Station at Ailaoshan, Jingdong, Yunnan 676209, China
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  • Youneng Xie

    1. Jingdong Bureau of National Nature Reserve, Jingdong, Yunnan 676209, China
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Abstract

This study seeks a further understanding on climate trends in a subtropical mountain forest, SW China. Air (Ta) and soil temperature (Ts), both in open land (1983–2010) and under a forest canopy (1986–2010), were investigated. Short-term radiation components were also measured simultaneously both in open land and understory to explore the relationships of microclimatic variables. Correlations of Ta and Ts with sunshine hours (St) and wind speed (Ws) were also analysed as driving factors of the temperature trends.

The results showed that (1) Understory radiation components were greatly reduced by the forest canopy, showing a strong effect of forest canopy on microclimatic variables. Ts_0 in open land was significantly correlated with solar radiation. Wind speed had significant influences on differences between Ta and Ts_0, between open land Ts_0 and understory Ts_0. The long-term data showed that Ts_0 under forest canopy were closely coupled with Ta in open land. (2) Ta had a larger increase than Ts_0 in open land, and temperature increases in winter were greater than in other seasons. Soil temperature at depths under forest canopy had nearly twice the increases of those on open land; we attributed this to the higher relative increase of Ws over St. (3) A slope change in 1998 was detected in the Ts_0 and Ta difference (Ts_0 − Ta) series, suggesting different response of Ts_0 and Ta since that year. Deceleration of St and stability of Ws may have been factors.

This study improves our understanding of warming in a nature reserve where anthropogenic influences are absent. Further studies are needed for the biological and biochemical implications on subtropical mountain forest. Copyright © 2012 Royal Meteorological Society

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