柞树幼苗硬化期在叶片吸收和光合作用之间的氮投资与土壤肥力的权衡

IF 3.4 2区 农林科学 Q1 FORESTRY Journal of Forestry Research Pub Date : 2024-08-22 DOI:10.1007/s11676-024-01775-x
Zexia Dong, Jiaxi Wang, Jingfei Chen, Guolei Li, Yong Liu, Yining Li, Yufan Zhu, Xiaoqian Meng
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引用次数: 0

摘要

叶片衰老前最重要的过程是养分吸收,这可以减少养分损失,并在随后的生长期最大限度地提高植物的适应能力。然而,植物必须在叶片中保留一定水平的氮(N),以维持硬化期间的碳同化。本研究的目的是调查在土壤肥力增加的情况下,幼苗在硬化期叶片氮吸收和光合作用所需的氮之间的权衡。我们进行了一项田间试验,以确定土壤肥力处理(17、34 或 68 毫克 N 苗-1)是否以及如何影响硬化期柞树叶片对氮的吸收和对光合装置的分配。分别在 T1(顶芽形成后)、T2(顶芽形成至生长期结束)和 T3(生长期结束时)对幼苗进行取样。结果表明,光合作用的氮含量在 T2 期持续上升,而非光合作用的氮则开始被吸收;随着土壤肥力的提高,叶片分配给光合装置的氮增加,推迟了氮的吸收。此外,土壤肥力会显著影响氮在不同光合成分之间的分配,从而在衰老期维持或增加光合特性。这项研究表明,在硬化期,为维持光合同化能力,需要在氮的吸收和光合作用之间进行权衡,而土壤肥力会影响这种平衡。Q. mongolica叶片主要从非光合装置中吸收氮,并将其投入到光合装置中,而不同的光合作用氮组分分配有效地改善了这种模式。
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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Tradeoffs of nitrogen investment between leaf resorption and photosynthesis across soil fertility in Quercus mongolica seedlings during the hardening period

The most important process before leaf senescence is nutrient resorption, which reduces nutrient loss and maximizes plant fitness during the subsequent growth period. However, plants must retain certain levels of nitrogen (N) in their leaves to maintain carbon assimilation during hardening. The objective of this study was to investigate the tradeoffs in N investment between leaf N resorption and N for photosynthesis in seedlings with increased soil fertility during the hardening period. A field experiment was conducted to determine if and how soil fertility treatments (17, 34, or 68 mg N seedling−1) affected N resorption and allocation to the photosynthetic apparatus in Quercus mongolica leaves during the hardening period. Seedlings were sampled at T1 (after terminal bud formation), T2 (between terminal bud formation and end of the growing period), and T3 (at the end of the growing period). Results showed that photosynthetic N content continued to rise in T2, while N resorption started from non-photosynthetic N. Leaf N allocation to the photosynthetic apparatus increased as soil fertility increased, delaying N resorption. Additionally, soil fertility significantly affected N partitioning among different photosynthetic components, maintaining or increasing photosynthetic traits during senescence. This study demonstrates a tradeoff in N investment between resorption and photosynthesis to maintain photosynthetic assimilation capacity during the hardening period, and that soil fertility impacts this balance. Q. mongolica leaves primarily resorbed N from the non-photosynthetic apparatus and invested it in the photosynthetic apparatus, whereas different photosynthetic N component allocations effectively improved this pattern.

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来源期刊
CiteScore
7.30
自引率
3.30%
发文量
2538
期刊介绍: The Journal of Forestry Research (JFR), founded in 1990, is a peer-reviewed quarterly journal in English. JFR has rapidly emerged as an international journal published by Northeast Forestry University and Ecological Society of China in collaboration with Springer Verlag. The journal publishes scientific articles related to forestry for a broad range of international scientists, forest managers and practitioners.The scope of the journal covers the following five thematic categories and 20 subjects: Basic Science of Forestry, Forest biometrics, Forest soils, Forest hydrology, Tree physiology, Forest biomass, carbon, and bioenergy, Forest biotechnology and molecular biology, Forest Ecology, Forest ecology, Forest ecological services, Restoration ecology, Forest adaptation to climate change, Wildlife ecology and management, Silviculture and Forest Management, Forest genetics and tree breeding, Silviculture, Forest RS, GIS, and modeling, Forest management, Forest Protection, Forest entomology and pathology, Forest fire, Forest resources conservation, Forest health monitoring and assessment, Wood Science and Technology, Wood Science and Technology.
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