Temporal Precipitation Variation and Leaf Stoichiometric Changes Mediate the Dynamics of Tree Growth Responses to Nitrogen Addition Over Time

IF 3.7 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Journal of Geophysical Research: Biogeosciences Pub Date : 2024-10-21 DOI:10.1029/2024JG008353
Aijun Xing, Haihua Shen, Enzai Du, Longchao Xu, Mengying Zhao, Jingyun Fang
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Abstract

Nitrogen (N) addition can stimulate tree growth; however, the strength of this growth effect usually changes over time and the factors underlying these responses are not fully understood. Based on a decade-long N addition experiment (by adding 0, 20, 50, and 100 kg N ha−1 yr−1) in a boreal forest, we studied responses of tree growth to N addition over time and explored the potential role of temporal precipitation variation and plant stoichiometric changes in mediating this. We found positive growth responses to N addition but this effect changed nonlinearly over time. Annual precipitation was positively related to growth under high-level N addition; hence, a hump-shape temporal pattern in precipitation contributed to the nonlinear tree growth responses. After precipitation effects were accounted for, the positive growth responses to N addition peaked in the seventh year and then declined for all levels of N. Later reductions in growth responses could partly be attributed to increased leaf N:phosphorus (P) ratio over time, especially at higher N addition rates. We also found an increase in soil acid phosphatase, the ratio of labile to occluded soil P fraction, and a decreased ratio in leaf N to P resorption efficiency with increasing N addition rates during the late stage of this experiment, suggesting increased P demand. Collectively, our results imply that changes in plant nutrient stoichiometry with cumulative N input may limit the N stimulation on tree growth over time, while temporal precipitation variation appears unlikely to modulate this effect under the atmospheric N deposition.

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降水量的时空变化和叶片化学计量变化是树木生长对氮添加反应随时间变化的动力机制
氮(N)添加可刺激树木生长;然而,这种生长效应的强度通常会随着时间的推移而变化,而且这些反应的基本因素尚未完全明了。基于一项在北方森林中进行的长达十年的氮添加实验(每年添加 0、20、50 和 100 千克氮公顷-1),我们研究了树木生长对氮添加的随时间变化的响应,并探讨了时间性降水变化和植物化学计量变化在其中的潜在作用。我们发现,树木生长对氮添加量的反应是积极的,但随着时间的推移,这种效应会发生非线性变化。年降水量与高水平氮添加下的生长呈正相关;因此,降水量的驼峰型时间模式促成了非线性的树木生长响应。在考虑了降水的影响后,对氮添加的正生长响应在第七年达到峰值,然后在所有氮添加水平下均有所下降。后来生长响应的下降可能部分归因于随着时间的推移叶片氮磷比的增加,尤其是在较高的氮添加率下。我们还发现,在实验后期,随着氮添加量的增加,土壤酸性磷酸酶、土壤中可溶性磷与闭塞性磷的比率都有所增加,叶片氮与磷的吸收效率比率也有所下降,这表明对磷的需求有所增加。总之,我们的研究结果表明,随着氮的累积输入,植物养分化学计量的变化可能会随着时间的推移限制氮对树木生长的刺激作用,而在大气氮沉降条件下,时间降水量的变化似乎不太可能调节这种效应。
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来源期刊
Journal of Geophysical Research: Biogeosciences
Journal of Geophysical Research: Biogeosciences Earth and Planetary Sciences-Paleontology
CiteScore
6.60
自引率
5.40%
发文量
242
期刊介绍: JGR-Biogeosciences focuses on biogeosciences of the Earth system in the past, present, and future and the extension of this research to planetary studies. The emerging field of biogeosciences spans the intellectual interface between biology and the geosciences and attempts to understand the functions of the Earth system across multiple spatial and temporal scales. Studies in biogeosciences may use multiple lines of evidence drawn from diverse fields to gain a holistic understanding of terrestrial, freshwater, and marine ecosystems and extreme environments. Specific topics within the scope of the section include process-based theoretical, experimental, and field studies of biogeochemistry, biogeophysics, atmosphere-, land-, and ocean-ecosystem interactions, biomineralization, life in extreme environments, astrobiology, microbial processes, geomicrobiology, and evolutionary geobiology
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