Nitrogen availability in soil controls uptake of different nitrogen forms by plants

IF 8.3 1区生物学 Q1 PLANT SCIENCES

New Phytologist Pub Date : 2024-12-11 DOI:10.1111/nph.20335

Min Liu, Xingliang Xu, Wolfgang Wanek, Jian Sun, Richard D. Bardgett, Yuqiang Tian, Xiaoyong Cui, Lili Jiang, Zeqing Ma, Yakov Kuzyakov, Hua Ouyang, Yanfen Wang

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引用次数: 0

Abstract

Nitrogen (N) uptake by plant roots from soil is the largest flux within the terrestrial N cycle. Despite its significance, a comprehensive analysis of plant uptake for inorganic and organic N forms across grasslands is lacking.
Here we measured in situ plant uptake of 13 inorganic and organic N forms by dominant species along a 3000 km transect spanning temperate and alpine grasslands. To generalize our experimental findings, we synthesized data on N uptake from 60 studies encompassing 148 plant species world-wide.
Our analysis revealed that alpine grasslands had faster NH₄⁺ uptake than temperate grasslands. Most plants preferred NO₃⁻ (65%) over NH₄⁺ (24%), followed by amino acids (11%). The uptake preferences and uptake rates were modulated by soil N availability that was defined by climate, soil properties, and intrinsic characteristics of the N form.
These findings pave the way toward more fully understanding of N cycling in terrestrial ecosystems, provide novel insights into the N form-specific mechanisms of plant N uptake, and highlight ecological consequences of chemical niche differentiation to reduce competition between coexisting plant species.

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土壤中氮的有效性控制着植物对不同形态氮的吸收

植物根系从土壤中吸收的氮是陆地氮循环中最大的通量。尽管具有重要意义，但缺乏对草原植物无机和有机氮形态吸收的综合分析。在这里，我们测量了优势物种对13种无机和有机氮形态的原位吸收，这些植物沿着3000公里的样带跨越温带和高山草原。为了概括我们的实验结果，我们综合了60项研究的氮吸收数据，这些研究涵盖了全球148种植物。分析表明，高寒草原对NH4+的吸收比温带草原快。大多数植物偏爱NO3−(65%)而不是NH4+(24%)，其次是氨基酸（11%）。土壤氮素有效性受气候、土壤性质和氮素形态内在特征的影响，可调节土壤氮素的吸收偏好和吸收速率。这些发现为更全面地了解陆地生态系统中的氮循环铺平了道路，为植物氮吸收的N形态特异性机制提供了新的见解，并强调了化学生态位分化减少共存植物物种之间竞争的生态后果。

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来源期刊

New Phytologist 生物-植物科学

自引率

5.30%

发文量

728

期刊介绍： New Phytologist is an international electronic journal published 24 times a year. It is owned by the New Phytologist Foundation, a non-profit-making charitable organization dedicated to promoting plant science. The journal publishes excellent, novel, rigorous, and timely research and scholarship in plant science and its applications. The articles cover topics in five sections: Physiology & Development, Environment, Interaction, Evolution, and Transformative Plant Biotechnology. These sections encompass intracellular processes, global environmental change, and encourage cross-disciplinary approaches. The journal recognizes the use of techniques from molecular and cell biology, functional genomics, modeling, and system-based approaches in plant science. Abstracting and Indexing Information for New Phytologist includes Academic Search, AgBiotech News & Information, Agroforestry Abstracts, Biochemistry & Biophysics Citation Index, Botanical Pesticides, CAB Abstracts®, Environment Index, Global Health, and Plant Breeding Abstracts, and others.