Enhanced foliar 15 N enrichment with increasing nitrogen addition rates Role of plant species and nitrogen compounds

Enhanced foliar 15 N enrichment with increasing nitrogen addition rates : Role of plant species and nitrogen compounds

© 2022 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 29(2023), 6 vom: 30. März, Seite 1591-1605
1. Verfasser: Wang, Yinliu (VerfasserIn)
Weitere Verfasser: Niu, Guoxiang, Wang, Ruzhen, Rousk, Kathrin, Li, Ang, Hasi, Muqier, Wang, Changhui, Xue, Jianguo, Yang, Guojiao, Lü, Xiaotao, Jiang, Yong, Han, Xingguo, Huang, Jianhui
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2023
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article N compounds N deposition N fixation arbuscular mycorrhiza foliar N concentration inorganic N δ15N Nitrogen N762921K75 mehr... Nitrogen Compounds Soil
Beschreibung
Zusammenfassung:© 2022 John Wiley & Sons Ltd.
Determining the abundance of N isotope (δ15 N) in natural environments is a simple but powerful method for providing integrated information on the N cycling dynamics and status in an ecosystem under exogenous N inputs. However, whether the input of different N compounds could differently impact plant growth and their 15 N signatures remains unclear. Here, the response of 15 N signatures and growth of three dominant plants (Leymus chinensis, Carex duriuscula, and Thermopsis lanceolata) to the addition of three N compounds (NH4 HCO3 , urea, and NH4 NO3 ) at multiple N addition rates were assessed in a meadow steppe in Inner Mongolia. The three plants showed different initial foliar δ15 N values because of differences in their N acquisition strategies. Particularly, T. lanceolata (N2 -fixing species) showed significantly lower 15 N signatures than L. chinensis (associated with arbuscular mycorrhizal fungi [AMF]) and C. duriuscula (associated with AMF). Moreover, the foliar δ15 N of all three species increased with increasing N addition rates, with a sharp increase above an N addition rate of ~10 g N m-2  year-1 . Foliar δ15 N values were significantly higher when NH4 HCO3 and urea were added than when NH4 NO3 was added, suggesting that adding weakly acidifying N compounds could result in a more open N cycle. Overall, our results imply that assessing the N transformation processes in the context of increasing global N deposition necessitates the consideration of N deposition rates, forms of the deposited N compounds, and N utilization strategies of the co-existing plant species in the ecosystem
Beschreibung:Date Completed 15.02.2023
Date Revised 26.05.2023
published: Print-Electronic
Citation Status MEDLINE
ISSN:1365-2486
DOI:10.1111/gcb.16555