Investigation of temperature and aridity at different elevations of Mt. Ailao, SW China

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• 作者：Guangyong You (1) (4)
  Yiping Zhang (1) (2) (3) (8)
  Yuhong Liu (1) (2) (3)
  Douglas Schaefer (1)
  Hede Gong (5)
  Jinbo Gao (4) (6)
  Zhiyun Lu (1) (2) (3)
  Qinghai Song (1) (4)
  Junbin Zhao (1) (4)
  Chuansheng Wu (1) (2) (3)
  Lei Yu (1) (4)
  Youneng Xie (7)
  
• 关键词：Drought ; Water evaporation demand ; Soil volumetric water content ; Bulk density ; Subtropical mountain forest
• 刊名：International Journal of Biometeorology
• 出版年：2013
• 出版时间：May 2013
• 年：2013
• 卷：57
• 期：3
• 页码：487-492
• 全文大小：211KB
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• 作者单位：Guangyong You (1) (4)
  Yiping Zhang (1) (2) (3) (8)
  Yuhong Liu (1) (2) (3)
  Douglas Schaefer (1)
  Hede Gong (5)
  Jinbo Gao (4) (6)
  Zhiyun Lu (1) (2) (3)
  Qinghai Song (1) (4)
  Junbin Zhao (1) (4)
  Chuansheng Wu (1) (2) (3)
  Lei Yu (1) (4)
  Youneng Xie (7)
  
  1. Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan, 666303, China
  4. Graduate School of the Chinese Academy of Sciences, Beijing, 100049, 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
  8. Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden (Kunming Section), Chinese Academy of Sciences, 88 Xuefu Road, Kunming, Yunnan, 650223, China
  5. Faculty of Ecotourism, Southwest Forestry University, Kunming, Yunnan, 650224, China
  6. Institute of the Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian, 361021, China
  7. Jingdong Bureau of National Nature Reserve, Jingdong, Yunnan, 676209, China
  
• ISSN：1432-1254

文摘

Our current understanding is that plant species distribution in the subtropical mountain forests of Southwest China is controlled mainly by inadequate warmth. Due to abundant annual precipitation, aridity has been less considered in this context, yet rainfall here is highly seasonal, and the magnitude of drought severity at different elevations has not been examined due to limited access to higher elevations in this area. In this study, short-term micrometeorological variables were measured at 2,480?m and 2,680?m, where different forest types occur. Drought stress was evaluated by combining measurements of water evaporation demand (E p) and soil volumetric water content (VWC). The results showed that: (1) mean temperature decreased 1?°C from 2,480?m to 2,680?m and the minimum temperature at 2,680?m was above freezing. (2) Elevation had a significant influence on E p; however, the difference in daily E p between 2,480?m and 2,680?m was not significant, which was possibly due to the small difference in elevation between these two sites. (3) VWC had larger range of annual variation at 2,680?m than at 2,480?m, especially for the surface soil layer. We conclude that the decrease in temperature does not effectively explain the sharp transition between these forest types. During the dry season, plants growing at 2,680?m are likely to experience more drought stress. In seeking to understand the mountain forest distribution, further studies should consider the effects of drought stress alongside those of altitude.