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The Geochemistry of Phosphorus in Peat Soils of a Semiarid Altered Wetland

^a Dep. of Biotechnology and Environmental Sciences, Tel-Hai College, Upper Galilee 12210, Israel
^b Dep. of Soil Science, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew Univ. of Jerusalem, Rechovot 76100, Israel
^c Dep. of Grassland Science, Technol. Univ. Muenchen, Am Hochanger 1, D-85350 Freising-Weihenstephan, Germany

View larger version (60K): [in a new window]   Fig. 1. The study sites in the Hula Valley showing sampling locations, real-time in situ monitoring stations, Lake Agmon and the drainage canals. The location of the former Hula Lake and swamps (drained) are shown in the middle map. Coordinates are given in meters.

View larger version (18K): [in a new window]   Fig. 2. Comparison between surface (0–130 cm) and subsurface peat soils (>130 cm) using organic matter (OM) (%) and sesquioxides (g kg–1) contents. The circle and asterisks are outlier and extreme value, respectively.

View larger version (29K): [in a new window]   Fig. 3. Saturation index (SI) of calcite and gypsum in soil interstitial water and shallow ground water indicated that most water samples were unsaturated with respect to gypsum but saturated with respect to calcite.

View larger version (16K): [in a new window]   Fig. 4. A comparison between the concentrations of the various P pools extracted from surface (0–130 cm) and subsurface peat soils (>130 cm). NS = not significant; * is P < 0.01 and ** is P < 0.001.