Oxmann, Julian F., Schwendenmann, Luitgard and Lara, Rubén J. (2009) Interactions among phosphorus, pH and Eh in reforested mangroves, Vietnam: a three-dimensional spatial analysis. Biogeochemistry, 96 (1-3). pp. 73-85. DOI https://doi.org/10.1007/s10533-009-9345-5.

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Sediment reduction is frequently proposed to increase available phosphorus (P) but several studies found also decreases. Another important factor for P liberation is the pH. We investigated the relative importance of Eh and pH on P cycling in reforested mangroves. Sediment P compounds, pH and Eh were analysed over depth along five transects of two areas in the Saigon River Delta and compared with leaf P levels. A three-dimensional spatial approach was used to investigate pH and Eh effects on P compound distribution at different sediment depth and locate layers of predominant P uptake. Along an inundation gradient, submergence durations of 254 to 2 days per year caused a large Eh gradient within the top 20 cm, whereas Eh response was small within 20–45 cm depth. At individual layers, a correlation between Eh and Al/Fe–P was only found in the upper depth interval (0–20 cm). No significant effect of Eh or Al/Fe–P on Morgan-P (available P) was detected. Minor effects on P composition changes by the Eh were caused through generally strongly reduced sediment at deeper layers (>20 cm). In contrast, pH variations produced extreme differences in both, Ca–P and available P content at layers of apparently predominant P uptake (>20 cm). As available P was correlated with Ca–P (p < 0.001), leaf P (p < 0.001) and pH (non linear correlation) it is likely that the pH sensitive Ca–P fraction is a more effective source for mangrove tree growth than Al/Fe–P. The predominant pH effect on P uptake within these reforested mangroves differs from a proposed reduction-governed P cycling in wetlands.

Document Type: Article
Programme Area: UNSPECIFIED
Research affiliation: Ecology > Mangrove Ecology
Affiliations > Not ZMT
Refereed: Yes
Open Access Journal?: No
DOI etc.: https://doi.org/10.1007/s10533-009-9345-5
ISSN: 0168-2563
Date Deposited: 25 Feb 2020 14:50
Last Modified: 01 Oct 2020 13:00
URI: http://cris.leibniz-zmt.de/id/eprint/3404

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