ISSN:
1573-5036
Keywords:
speciation
;
leaf metal content
;
GEOCHEM
;
tolerance
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract A greenhouse experiment was conducted to examine the effects of salinity and flooding level on interstitial solute speciation and solute uptake byPanicum hemitomum grown on intact marsh substrates. The experimental set-up consisted of a factorial arrangement of treatments (5 salinity levels×3 flooding levels) with 4 replications. Salinity treatments with the addition of salt (Instant Oceanr) successfully increased interstitial pore water conductivities and resulted in significantly different treatment means. Redox potentials and proton activities were significantly higher in the drained treatment, with only minor differences between the two flooded treatments. There was not a significant pH effect due to salinity, although a significant interaction between salinity and flooding level was observed. Analysis of variance suggested that electro-chemical and interstitial solute behaviour could significantly be described by salinity and flooding treatments. GEOCHEM calculations were performed in order to relate leaf concentrations to ion activities in interstitial soil solutions. Leaf contents of Mg, Ca, K, Mn, and Cu were significantly correlated with the activities of corresponding ions in the interstitial pore water. However, most of the variabilitiy in leaf metal content could be accounted for by treatment effects. Regression analysis showed that the ion activities explained less than 25% of the variability in leaf metal content.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02220798
Permalink
