Provenance-specific growth responses to drought and air warming in three European oak species (Quercus robur, Q.petraea and Q.pubescens)
Provenance-specific growth responses to drought and air warming in three European oak species (Quercus robur, Q.petraea and Q.pubescens)
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DOI：
10.1093/treephys/tpr004
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发表时间：
2011-03-01
期刊：
影响因子：
4
通讯作者：
Dobbertin, Matthias
中科院分区：
文献类型：
--
作者：
Arend, Matthias;Kuster, Thomas;Dobbertin, Matthias
研究了种源特异性生长对干旱和气温升高的响应。每个物种的四个种源生长在大开顶室，并进行四个气候：控制，周期性干旱，空气变暖或其组合在随后的3年。种源间的总体生长响应表现为干旱降低了枝高生长和茎粗生长，增温促进了枝高生长，但降低了茎粗生长和根长生长。在芽，茎和根的差异生长反应导致异速生长关系的改变。根长增长，茎高增长增加，响应干旱，但在响应空气变暖下降。茎粗生长对枝高生长的响应随气温升高而降低。种源对干旱和空气变暖的敏感性表明，种源之间的茎和芽的生长反应是高度可变的，但这种反应的变异性并不反映当地适应种源原产地的气候条件。枝高生长被认为是更敏感的干旱种源从北方纬度比种源从南纬度，这表明遗传因素有关的欧洲橡树冰后期移民历史可能干扰了选择压力在种源起源。
Provenance-specific growth responses to experimentally applied drought and air warming were studied in saplings of three European oak species: Quercus robur, Quercus petraea and Quercus pubescens. Four provenances of each species were grown in large open-top chambers and subjected to four climates: control, periodic drought, air warming or their combination in 3 subsequent years. Overall growth responses were found among species and provenances, with drought reducing shoot height growth and stem diameter growth and air warming stimulating shoot height growth but reducing stem diameter growth and root length growth. Differential growth responses in shoots, stems and roots resulted in altered allometric growth relations. Root length growth to shoot height growth increased in response to drought but decreased in response to air warming. Stem diameter growth to shoot height growth decreased in response to air warming. The growth responses in shoots and stems were highly variable among provenances indicating provenance-specific sensitivity to drought and air warming, but this response variability did not reflect local adaptation to climate conditions of provenance origin. Shoot height growth was found to be more sensitive to drought in provenances from northern latitudes than in provenances from southern latitudes, suggesting that genetic factors related to the postglacial immigration history of European oaks might have interfered with selective pressure at provenance origins.