grey alder (Alnus incana)

We are sorry, the portraits of the tree species are only available in German, French and Italian.

NFI sample plots with species occurrences between 1983 and *

* An occurrence is only shown with a dot on the map if the selected tree or shrub species were detected in at least two inventories.

key figures

NFI4
state 2009/17
	production region
	Jura		Plateau		Pre-Alps		Alps		Southern Alps		Switzerland
topic (target variable)	mean	±	mean	±	mean	±	mean	±	mean	±	mean	±
number of stems 1000 n	99	63	233	77	1376	302	4776	799	1117	285	7601	906
number of stems %	0.1	0.1	0.3	0.1	1.4	0.3	2.9	0.5	1.6	0.4	1.5	0.2
growing stock (stemwood) 1000 m³	23	17	69	25	259	62	759	133	211	68	1321	164
growing stock (stemwood) %	0.0	0.0	0.1	0.0	0.3	0.1	0.6	0.1	0.5	0.2	0.3	0.0
growing stock (stemwood)/number of stems m³/n	0.23	0.04	0.30	0.08	0.19	0.02	0.16	0.01	0.19	0.04	0.17	0.01

The mean ± absolute standard error of the estimate is given in each case.

evaluation area: accessible forest without shrub forest

grid: 1.4 x 1.4 km grid

NFI3–NFI4
change 2004/06–2009/17
	production region
	Jura		Plateau		Pre-Alps		Alps		Southern Alps		Switzerland
topic (target variable)	mean	±	mean	±	mean	±	mean	±	mean	±	mean	±
increment (gross increment) 1000 m³/yr	0	0	3	2	11	3	51	14	5	2	67	14
fellings and mortality 1000 m³/yr	1	1	2	1	24	7	43	12	19	7	87	15

The mean ± absolute standard error of the estimate is given in each case.

evaluation area: accessible forest without shrub forest NFI3/NFI4

grid: 1.4 x 1.4 km grid