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首页> 外文期刊>Trees. Structure and Function >Ecophysiological adaptations of black spruce (Picea mariana) and tamarack (Larix laricina) seedlings to flooding
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Ecophysiological adaptations of black spruce (Picea mariana) and tamarack (Larix laricina) seedlings to flooding

机译：黑云杉（Picea mariana）和塔玛拉克（Larix laricina）幼苗对洪水的生态生理适应

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Black spruce [ Picea mariana (Mill.) B.S.P.] and tamarack [ Larix laricina (Du Roi) K. Koch] are the predominant tree species in boreal peatlands. The effects of 34 days of flooding on morphological and physiological responses were investigated in the greenhouse for black spruce and tamarack seedlings in their second growing season (18 months old). Flooding resulted in reduced root hydraulic conductance, net assimilation rate and stomatal conductance and increased needle electrolyte leakage in both species. Flooded tamarack seedlings maintained a higher net assimilation rate and stomatal conductance compared to flooded black spruce. Flooded tamarack seedlings were also able to maintain higher root hydraulic conductance compared to flooded black spruce seedlings at a comparable time period of flooding. Root respiration declined in both species under flooding. Sugar concentration increased in shoots while decreasing in roots in both species under flooding. Needles of flooded black spruce appeared necrotic and electrolyte leakage increased over time with flooding and remained significantly higher than in flooded tamarack seedlings. No visible damage symptoms were observed in flooded tamarack seedlings. Flooded tamarack seedlings developed adventitious roots beginning 16 days after the start of flooding treatment. Adventitious roots exhibited significantly higher root hydraulic conductivity than similarly sized flooded tamarack roots. Flooded black spruce lacked any such morphological adaptation. These results suggest that tamarack is better able to adjust both morphologically and physiologically to prolonged soil flooding than black spruce seedlings.
机译：黑云杉[Picea mariana（Mill。）B.S.P.]和塔玛拉克[Larix laricina（Du Roi）K. Koch]是北方泥炭地的主要树种。在温室中研究了黑云杉和ta柳幼苗在第二个生长季节（18个月大）下34天淹水对形态和生理响应的影响。淹水导致这两种物种的根系水力导度，净同化率和气孔导度降低，针电解质泄漏增加。与淹没的黑云杉相比，淹没的塔玛拉克幼苗保持较高的净同化率和气孔导度。与水淹的黑云杉幼苗相比，淹水的塔玛拉克幼苗还能够在较高的淹水时期保持较高的根系水力传导率。淹水后两个物种的根呼吸均下降。在淹水的情况下，两个物种的芽中糖浓度均增加，而根部却降低。随着时间的流逝，淹没的黑云杉针头出现坏死，电解液泄漏随时间增加，并且仍然显着高于淹没的塔玛拉克幼苗。在淹没的mar柳幼苗中未观察到可见的破坏症状。开始淹水处理后16天，淹没的塔玛拉克幼苗开始出现不定根。不定根表现出比相似大小的淹水柳根更高的根水力传导率。泛滥的黑云杉缺乏这种形态上的适应性。这些结果表明，与黑云杉幼苗相比，tamarack能够更好地在形态和生理上适应长时间的土壤泛滥。

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