Nighttime Warming Enhances Tree Growth in Temperate Tree Species.

IF 6.3 1区 生物学 Q1 PLANT SCIENCES
Bingxin Han, Zhaoguo Wang, Di Liu, J Julio Camarero, Maurizio Mencuccini, Binqing Zhao, Yuan Liu, Yushuang Xie, Xiaochun Wang
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Abstract

Asymmetric warming in temperate regions differentially impacts tree growth depending on whether daytime or nighttime temperatures increase. To elucidate the underlying mechanisms and species-specific responses, we investigated five temperate broadleaf tree species (Juglans mandshurica, Phellodendron amurense, Fraxinus mandshurica, Betula platyphylla and Tilia amurensis) exhibiting contrasting water status regulation strategies and differing in mycorrhizal types. Seedlings of the five species were subjected to five temperature treatments: ambient control, daytime warming (+2°C, DT+2 and +4°C, DT+4) and nighttime warming (+2°C, NT+2 and +4°C, NT+4). Radial growth and xylogenesis were monitored throughout the growing season. Notably, only NT+2 significantly increased ring width (+99.42%) and theoretical hydraulic conductivity (+260.58%) across all species. Nighttime warming enhanced radial growth by increasing the number of cambium and radially enlarging cells, while daytime warming extended the xylem formation period. Furthermore, mean ring width (MRW) increased significantly with radially enlarging cells (maxEC) under nighttime warming. This response pattern was particularly pronounced in arbuscular mycorrhizal and isohydric species, contrasting with ectomycorrhizal and anisohydric species. Collectively, our results demonstrate that the effects of asymmetric warming on tree growth are contingent upon both the amplitude and timing of temperature increases. These findings provide critical mechanistic insights into how asymmetric warming influences tree growth and forest productivity, aiding predictions of carbon sequestration potential under climate change.

夜间变暖促进温带树种的生长。
温带地区的不对称变暖对树木生长的影响取决于白天或夜间温度的升高。为了阐明潜在的机制和物种特异性反应,我们研究了五种温带阔叶树(核桃、黄柏、水曲柳、白桦和椴),它们表现出不同的水分状态调节策略和不同的菌根类型。将5种植物幼苗分别进行环境控制、日间增温(+2℃,DT+2和+4℃,DT+4)和夜间增温(+2℃,NT+2和+4℃,NT+4) 5种温度处理。在整个生长季节监测径向生长和木质发生。值得注意的是,在所有物种中,只有NT+2显著增加了环宽(+99.42%)和理论导水率(+260.58%)。夜间增温通过增加形成层的数量和径向增大的细胞来促进径向生长,而白天增温则延长了木质部的形成期。夜间增温条件下,平均环宽(MRW)随细胞径向增大(maxEC)显著增加。这种反应模式在丛枝菌根和等水合种中特别明显,与外生菌根和各水合种形成对比。总的来说,我们的结果表明,不对称变暖对树木生长的影响取决于温度升高的幅度和时间。这些发现为不对称变暖如何影响树木生长和森林生产力提供了关键的机制见解,有助于预测气候变化下的碳封存潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Plant, Cell & Environment
Plant, Cell & Environment 生物-植物科学
CiteScore
13.30
自引率
4.10%
发文量
253
审稿时长
1.8 months
期刊介绍: Plant, Cell & Environment is a premier plant science journal, offering valuable insights into plant responses to their environment. Committed to publishing high-quality theoretical and experimental research, the journal covers a broad spectrum of factors, spanning from molecular to community levels. Researchers exploring various aspects of plant biology, physiology, and ecology contribute to the journal's comprehensive understanding of plant-environment interactions.
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