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首页> 外文期刊>Scandinavian Journal of Forest Research >Responses of Pinus massoniana and Pinus taeda to freezing in temperate forests in central China.
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Responses of Pinus massoniana and Pinus taeda to freezing in temperate forests in central China.

机译：中国中部温带森林中马尾松和taeda松对冻结的响应。

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摘要

Masson pine (Pinus massoniana Lamb.), a native species widely distributed in temperate forests in central China, and Loblolly pine (Pinus taeda L.), an exotic tree species introduced to China from southeastern United States, are dominant evergreen conifers that play a pivotal role in maintaining forest structure and functions for the region. We examined the effects of freezing on these species with chlorophyll fluorescence and electrolyte leakage using both field- and laboratory-based experiments in September 2009 and January 2010, respectively. We found that freezing could cause a greater impact on the Loblolly pine than the Masson pine. Although the two species showed similar values of Fv/Fm and electrolyte leakage before freezing, the Masson pine needles showed lower Fv/Fm and higher electrolyte leakage ratios than those of the Loblolly pine when treated in low temperatures (-15 to 0 degrees C). We also found that cold-acclimation was crucial for both species to adapt to low temperatures with the Fv/Fm ratio decreased approximately by 80% in the first freezing hour for the non-acclimated needles of both species while the cold-acclimated needles showed little changes in the Fv/Fm ratio. This finding is also supported by our measurements of electrolyte leakage. These results suggest that the Loblolly pine could be more susceptible to freezing damages than the Masson pine in central China.
机译：马尾松（Pinus massoniana Lamb。）是在中国中部温带森林中广泛分布的本地树种，而火炬松（Pinus taeda L.）是从美国东南部引入中国的外来树种，是占主导地位的常绿针叶树在维护该地区森林结构和功能方面起着关键作用。我们分别在2009年9月和2010年1月使用基于实地和实验室的实验研究了叶绿素荧光和电解质渗漏对这些物种冷冻的影响。我们发现，冷冻比马尾松对火炬松的影响更大。尽管这两个物种在冻结前显示出相似的F v / F m 值和电解质渗漏，但是Masson松针显示出较低的F v / F在低温（-15至0摄氏度）下处理时， m 和电解质泄漏率要比Loblolly松更高。我们还发现，冷适应对于这两个物种适应低温都是至关重要的，F v / F m 的比率在第一个冻结小时的大约20％降低了80％。两种物种的未适应针均表现出差异，而冷适应针的F v / F m 比例变化很小。我们对电解质泄漏的测量也支持了这一发现。这些结果表明，与中国中部的马尾松相比，火炬松更容易受到冻害。

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