Effects of waterlogged soil on N-uptake by flood tolerant and sensitive containerised tree seedlings. Issue 3 (3rd July 2019)

• Record Type: Journal Article
• Authors: Ow, Lai Fern; Ghosh, Subhadip; Lokman Yusof, Mohamed
• Is Part Of: Arboricultural journal. Volume 41:Issue 3(2019)
• Page Start: 172
• Page End: 188
• Publication Date: 2019-07-03
• Subjects: Ammonium -- flooding -- nitrate -- tropical trees -- urban conditions; Arboriculture -- Periodicals; Trees -- Periodicals; Trees -- Great Britain -- Periodicals; 634.9
• DOI: 10.1080/03071375.2019.1642049
• Languages: English
• ISSNs: 0307-1375

Abstract

ABSTRACT: This study was conducted to determine changes in nitrogen concentrations in urban tropical tree species across short-and long-term flooding with a week of recovery. The roots of Pouteria obovata (flood-tolerant), Albizia saman (moderately flood-tolerant) and Peltophorum pterocarpum (flood-sensitive) were exposed to different flooding treatments (5 and 21 days). N uptake, amino acid, protein, chlorophyll concentrations, respiration and photosynthesis were measured. Differences between the moderately flood-tolerant and flood-sensitive species were observed only in the uptake rates of nitrate (NO3 – ) and ammonia (NH4 + ) and protein concentrations. Short-term (5 days) flooding decreased N concentrations but recovery was observed after long-term (21 d) flooding with the exception of the flood-sensitive species. Amino acids in the foliage across all three species were found to have significantly increased with short-term flooding but this increase was short-lived as a decline was observed following long-term flooding. Amino acids (in the roots) and chlorophyll concentrations indicated that P. obovata was more flood-tolerant and had greater recovery potential than the other two species. Photosynthesis and transpiration were significantly decreased in all species with long-term flooding, but recovery occurred after a week. The results confirmed that flooding can impact on nitrogen uptake and related protein and pigment concentrations in the urban tropical trees investigated here.