100 years of change in an old-growth Scots pine forest in Hamra National Park: insights from permanent plots established in central Sweden in 1922

Figures & data

Table 1. Changes in the number of living trees in the plot and the basal area of living and dead trees from 1922 to 2022.

Species	Number of trees in 1922	% of all trees	Number of trees in 2022	% of all trees in 2022	Absolute change	Relative change
Scots pine	439	74%	477	47%	38	109%
Norway spruce	49	8%	453	45%	404	924%
Birch	101	17%	57	6%	−44	56%
Other broadleaves	4	1%	26	2%	22	650%
Total	593	100%	1013	100%	420	171%
Calculated basal area m^2 / ha
	Living trees			Dead trees (lying and standing)
	1922	2022	Relative change	1922	2022	Relative change
Scots pine	19.92	27.43	138%	5.11	14.12	277%
Norway spruce	0.68	4.59	682%	0	0.29	–
Birch	0.68	1.17	172%	0.01	0.11	1042%
Other broadleaves	0.05	0.10	183%	0	0.10
Total	21.32	33.29	156%	5.12	14.62	286%
% Norway spruce	3%	14%	–	–	–	–

Figure 1. Changes in annual average basal area increment of Scots pine trees in Hamra National Park from 1922 to 2022.

Data availability statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.