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Table II

Thinning experiments – control plot data.

Study and species n 1 Age2 Obs. Volume Net increment Mortality q α
period3 (m3 ha−1) (m3 ha−1 y−1) (m3 ha−1 y−1)
1, Lodgepole pine (Pinus contorta) 6 40 5 334 6.54 2.32 0.060 –1.74
2, Scots pine (Pinus sylvestris) 5 55 6.25 518 11.59 5.11 0.072 –1.91
3, Hemlock (Tsuga heterophylla) 2 72 32 1042 15.94 6.01 0.321 –1.71
4, Monarch birch (Betula maximowicziana) 2 77 14 214 1.57 1.55 14 –2.22
5, Gold birch (Betula ermanii) 2 25 10 133 8.91 1.38 0.243 –2.21

All values are means for each species.

1

Number of observations,

2

mean stand age during experiment,

3

duration over which mean responses were estimated,

4

adjusted value, measured value was 1.27. References for studies 1–5, respectively: Johnstone (2002), Montero et al. (2001), Omule (1988), Watanabe (2002), Asai (1997). The complete data set is shown in Appendix Table.