The effect of forestry drainage on vertical distributions of major plant nutrients in peat soils |
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Authors: | Laiho Raija Sallantaus Tapani Laine Jukka |
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Institution: | (1) Department of Forest Ecology, Helsinki University, P.O. Box 24, FIN-00014, Finland;(2) Pirkanmaa Regional Environmental Agency, P.O. Box 297, 33101 Tampere, Finland |
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Abstract: | Vertical distributions of total N, P, K, Ca and Mg in a 0–60 cm surface peat layer were studied at 80 pine mire sites in southern
Finland. The sites fell into two categories according to the soil nutrient regime: Meso-oligotrophic and oligo-ombrotrophic,
and formed a chronosequence from undrained sites to sites drained 55 years ago. A statistically significant drainage age effect
on the gravimetric (mg g-1) concentration profile forms was detected for all nutrients except K. In oligo-ombrotrophic sites
the concentration of N increased following drainage in the topmost layer (0–10 cm) and that of P in all layers. In meso-oligotrophic
sites the changes in N and P profiles were obscure. The concentration profiles of K remained clearly surface-enriched in both
site type groups, but there was a general drop in the concentration values immediately after drainage. Ca and Mg decreased,
especially in the 10–20 and 25–35 cm layers in both site type groups. The volumetric (kg m-3) nutrient concentrations clearly
reflected the increase in the bulk density of the surface peat occurring after drainage. The compaction of peat had compensated
for the effect of the processes removing nutrients from the soil (increased tree stand uptake, leaching); for Ca and Mg to
a lesser degree than for the other nutrients. It was concluded that the N, P and K profiles did not show changes that would
be likely to affect site productivity, whereas the net loss of Ca and Mg may cause problems in the longer term. As the total
K capital of the sites was in general rather small, a disturbance in the biological cycle, such as cutting of the tree stand,
may be critical.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | drainage mire nutrients peatland forestry |
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