4.7 Article

Climatic influences on intra-annual stem radial variations and xylem formation of Toona ciliata at two Asian tropical forest sites with contrasting soil water availability

期刊

AGRICULTURAL AND FOREST METEOROLOGY
卷 318, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.agrformet.2022.108906

关键词

Climate responses; Cambial activity; Xylem cell differentiation; Tropical rainforest; Karst; Point dendrometer

资金

  1. National Natural Science Foundation of China (NSFC) [3186113307, 31870591, 31770533]
  2. German Research Foundation (DFG-grant) [BR 1895/31-1]
  3. ANSO Scholarship for Young Talents [2020-025]
  4. Ten Thousand Talent Project of Yunnan Province [YNWR-QNBJ-2019-190, YNWR-QNBJ-2020-095]
  5. West Light Talent Program of the Chinese Academy of Sciences
  6. Xishuangbanna Station for Tropical Rain Forest Ecosystem Studies

向作者/读者索取更多资源

This study investigates the effects of climatic drivers and local site differences on the tree stem radial growth in tropical forests in southwestern China. The results show that soil water availability has a strong influence on the growth season, growth rates, and xylem productivity of trees. Additionally, precipitation, air temperature, and relative humidity also affect tree growth.
Climate extremes will increasingly influence ecosystem productivity of tropical forests, but little is known about their effects on tree stem radial growth, a major component of forest productivity. To analyze the role of climatic drivers and local site differences on tree growth at sub-annual timescales, we studied the timing, magnitude and climatic drivers of stem growth and xylem formation at two tropical forest sites with contrasting soil water availability in southwestern China. We combined high-resolution point dendrometer recordings and microcoring to investigate intra-annual stem radius variation and xylem formation of Toona ciliata over three consecutive years (2018-2020). Stem radial increment of T. ciliata derived from dendrometer data showed distinct seasonal patterns, with growth mainly occurring during March to October. The start day of stem radial growth coincided with the occurrence of the cell enlarging phase, and its end day occurred concomitantly with the cessation of cell enlarging as identified from microcores. Toona ciliata trees at the tropical ravine rainforest site with higher soil water availability showed higher mean annual stem radial increment, higher daily growth rates, and longer duration of xylem productivity than that at the tropical karst forest site. Weekly stem radial growth rates increased with precipitation and air temperature at the wetter ravine rainforest site, while relative humidity had a positive effect at the drier karst forest site. Our findings indicate that drought stress advances and shortens the growing season for T. ciliata. Our study highlights the strong influence of soil water capacity mediating the impact of climate, so response to drought is site-specific, which should be considered in growth models.

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