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Altered Podzolization Resulting from Replacing Heather with Sitka Spruce

^a Dep. of Earth Sciences, Univ. of Aarhus, Ny Munkegade Bygn. 520, DK-8000 Aarhus, Denmark
^b Dep. of Chemistry, Univ. of Aarhus, Langelandsgade 140, DK-8000 Aarhus C, Denmark

View larger version (26K): [in a new window]   Fig. 1. Location of the field site.

View larger version (129K): [in a new window]   Fig. 2. The study site with location of plots and vegetation distribution. The white spruce area is 10 ha.

View larger version (28K): [in a new window]   Fig. 3. Transport of Al, Fe, and dissolved organic C (DOC) under the two ecosystems. Notice the downward increasing Al transport under spruce.

View larger version (35K): [in a new window]   Fig. 4. Comparison of the dithionite citrate bicarbonate- (DCB) and pyrophosphate- (PYR)extractable Al and Fe under heather and spruce. The content is the total in the upper 160-cm of the soil. The bars mark the standard deviation. For spruce n = 5 and for heather n = 14.

View larger version (23K): [in a new window]   Fig. 5. The relationship between dissoved organic C (DOC) and anion deficit in the soil water measured in individual samples. There is a clear linear relationship between DOC and anion deficit (a) under heather, whereas (b) under spruce the distribution is more random and divided into areas according to depth. Results from 60 cm below heather are missing because of too little water to make all the analysis necessary to make a charge balance.