Relevance of organic vs. inorganic nitrogen in intra- and interspecific competition of seven central European tree species

IF 2.1 3区农林科学 Q2 FORESTRY Trees Pub Date : 2023-06-23 DOI:10.1007/s00468-023-02418-0

Judy Simon

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Key message

When competing for nitrogen with other tree species, organic N is more important than inorganic N for most species

Abstract

Competition for nitrogen (N) in the rhizosphere is a key process regulating a seedling´s chances for growth and survival. However, only few studies have investigated this at the individual species´ level when using a community approach. In this study, ¹⁵N incubation experiments were conducted to quantify inorganic (i.e. ammonium and nitrate) and organic (i.e. glutamine-N and arginine-N) net N-uptake capacity of seven temperate woody species co-occurring on calcareous substrate and to investigate the consequences of intra- vs. interspecific competition in a woody seedling community. The results showed that short-term net inorganic and organic N uptake capacity was unrelated to a seedling´s fast or slow growth. Furthermore, competition with other tree species did not change a seedlings´ overall capacity to take up inorganic and organic N sources. Organic N was preferred over inorganic N for most species and the preferences for specific N source shifted with competition regime and tree species. Overall, this study indicates the importance of organic N sources for N uptake in woody seedlings.

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有机氮与无机氮在七种中欧树种种内和种间竞争中的相关性

摘要在与其他树种竞争氮素时，有机氮比无机氮更重要。根际氮(N)竞争是调节幼苗生长和生存机会的关键过程。然而，只有很少的研究使用群落方法在单个物种水平上进行了调查。本研究通过15N培养实验，量化了7种温带木本植物在钙质基质上共生的无机(如铵和硝)和有机(如谷氨酰胺- n和精氨酸- n)净氮吸收能力，并研究了木本幼苗群落种内与种间竞争的后果。结果表明，短期净无机氮和有机氮吸收能力与幼苗生长快慢无关。此外，与其他树种的竞争并没有改变幼苗吸收无机和有机氮源的总体能力。大多数树种对有机氮的偏好高于无机氮，对特定氮源的偏好随竞争机制和树种而变化。综上所述，本研究表明有机氮源对木本幼苗氮吸收的重要性。

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来源期刊

Trees 农林科学-林学

CiteScore

4.50

自引率

4.30%

发文量

113

审稿时长

3.8 months

期刊介绍： Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.