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柳树 (Quercus phellos) 的苗根在秋冬期间以依赖于土壤温度的方式继续呼吸和生长

Jonathan M Kressuk^1,2, James T Collins^1,3, Emile S Gardiner⁴

¹College of Forestry Agriculture and Natural Resources, University of Arkansas at Monticello, 110 University Court, Monticello, AR 71656, USA.

Tree physiology

|December 10, 2024

概括

柳树的根在冬天继续生长,其活动受到土壤温度的直接影响. 较低的土壤温度会减少根的生长和呼吸,但不会导致寒冷的适应.

科学领域:

森林生态森林生态
植物生理学植物生理学
树生物学树生物学

背景情况:

底部的硬木森林,包括绿树水库 (GTRs),面对物种由于洪水压力而远离红树.
树木洪水压力主要影响根系,可能发生在冬季休眠期之前.

研究的目的:

调查寒冷土壤温度对柳树 (Quercus phellos L.) 冬季根生长和呼吸的影响.
为了确定根活动是否对地下土壤温度或地面环境线索作出反应.

主要方法:

在秋冬过渡期间,集装箱中的柳树苗木经受到了不同的土壤温度 (15°C,10°C,5°C).
根的延长是通过在根盆中重复成像来测量的.
在各种土壤温度下测量了根呼吸率和Q10值,以评估能量支出和寒冷适应.

主要成果:

根的延长在冬季在土壤温度≥5°C下持续,即使干的延长停止了.
在较低的土壤温度 (10°C和5°C) 中,根延长和呼吸率都显著下降.
Q10值保持不变,表明根呼吸活动没有冷适应.

结论:

柳树根在冬季呈现连续增长,与许多温带物种不同,其活动直接和可逆地受到土壤温度的调节.
根的延长似乎依赖于过冬的叶子中的光同化物.
土壤温度是影响柳树根生长和整个冬季呼吸的关键因素.

关键词:

树苗苗树苗苗的种子底部地区的硬木森林.绿树水库绿树水库根系球的温度和温度.根系的现象学根系的现象学冬季休眠状态是什么

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