M. Ohlson, Differentiation in adaptive traits between neighbouring bog and mineral soil populations of Scots pine Pinus sylvestris, ECOGRAPHY, 22(2), 1999, pp. 178-182
I used a reciprocal sowing experiment in the held to reveal differentiation
in adaptive traits between two neighbouring northern populations of Scots
pine Pinus sylvestris. I compared a peat bog population with a mineral soil
population. Seedling survival was monitored during seven growing seasons a
nd the plants were then harvested to obtain data on pine traits associated
with growth and resource allocation, i.e. height, needle length, total dry
weight, relative growth, proportion root and proportion needles. Seeds From
the pear bog populations had lower germination capacity and were smaller t
han those from the mineral soil population. Despite their smaller size, the
seeds from the bog population were superior for establishment of pines on
the bog. On the mineral soil, the traits were strikingly similar in the two
pine populations. In contrast, the traits were more variable and different
iated on the bog. Here, the native bog pines grew faster and had a larger p
roportion root than those originating from the population on the adjacent m
ineral soil. It is suggested that the differentiation between peat bog popu
lations and mineral soil populations might represent a major direction of d
ifferentiation in northern Scots pine populations.