Stem increment and hydraulic architecture of a boreal conifer (Larix sibirica) under contrasting macroclimates

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• 作者：Tselmeg Chenlemuge ; Bernhard Schuldt ; Choimaa Dulamsuren ; Dietrich Hertel…
• 关键词：Hydraulic conductivity ; Wood anatomy ; Xylem anatomical plasticity ; Precipitation ; Drought adaptation
• 刊名：Trees - Structure and Function
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：29
• 期：3
• 页码：623-636
• 全文大小：583 KB
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• 作者单位：Tselmeg Chenlemuge (1)
  Bernhard Schuldt (1)
  Choimaa Dulamsuren (1)
  Dietrich Hertel (1)
  Christoph Leuschner (1)
  Markus Hauck (1)
  
  1. Plant Ecology, Albrecht von Haller Institute for Plant Sciences, Georg August University of G?ttingen, Untere Karspüle 2, 37073, Gottingen, Germany
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Forestry
  Plant Sciences
  Agriculture
  Plant Anatomy and Development
  Plant Pathology
  Plant Physiology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-2285

文摘

Key message Hydraulic conductivity and wood anatomical traits in Larix sibirica are correlated with macroclimate, and growing season precipitation in particular, along a precipitation gradient of 700?mm?year ? . Abstract Empirical (K _s) and theoretical (K _p) sapwood area-specific hydraulic conductivity, hydraulically weighted (d _h ) and simple (d) tracheid diameters as well as tracheid density (TD) in roots, stems, and branches were studied in Larix sibirica trees, the dominant conifer at the southern, drought-affected range limit of the boreal forest in Inner Asia. We compared the hydraulic architecture of L. sibirica in two stands in Mongolia to larch trees grown in Central Europe under moist conditions and related hydraulics to macroclimate (precipitation, temperature) and productivity (basal area increment, BAI). K _s, K _p, d _h, and d correlated positively, and TD negatively with precipitation, temperature, and also BAI. Mean growing season precipitation (MGSP) seemed to affect the hydraulic traits more than temperature. A meta-analysis covering data of 14 conifer species from the northern hemisphere revealed a general relationship between MGSP and hydraulic traits. In contrast to expectation, K _p and d _h did not show a steady decline from roots through the stem to branches in L. sibirica, but were of similar size or larger in the stem. Our results suggest that considerable plasticity in the hydraulic architecture is an important element of the drought adaptation of L. sibirica. It combines with drought-induced fine root abscission (as reported from earlier work) which may help to protect larger roots and the stem from cavitation.