Improving estimations of maximal stand density by combining Reineke’s size-density rule and the yield level, using the example of spruce (Picea abies (L.) Karst.) and European Beech (Fagus sylvatica L.)

Free Access

Table I

Characteristics of the data material, distribution between different yield series and not permanent surveys, for the different thinning regimes.

Type of survey	Thinning regime A		B		C		D		H

	N _s	N _i	N _s	N _i	N _s	N _i	N _s	N _i	N _s	N _i
Spruce
Complete long time series^a	3	27	4	29	3	25	3	20	3	23
Incomplete time series^b			7	62	5	35	1	10	2	15
Short time series^c	8	21	13	44	3	8	1	1	5	16
One time plot	45	45	3	3	1	1			29
Slovakia, permanent t plots	1	4

Sum	57	97	27	138	12	69	5	31	39	83

Beech
Complete long time series	3	26	5	62	6	76	3	38	6	75
Incomplete time series			17	169					1	14
Short time series	4^d	12	26	73	7	30	2	8	5	18
One time plot	6	6							13	13

Sum	13	44	48	304	13	106	5	46	25	120

Thinning regime according to the IUFRO definition and [41]: A = natural thinning; B = moderate thinning from below, C = heavy thinning from below; D = very heavy thinning from below, H = selective thinning from above. Ns = Number of sites; Ni = Number of surveys.

Long time series in the same stand, more than 5 repeated surveys.

Diachronic time series at the same site.

Short time series, 2–5 repeated surveys.

From the reserve St-Ursanne Switzerland.