black alder (Alnus glutinosa)

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	161	62	1196	317	0	.	0	.	507	168	1863	364
number of stems %	0.2	0.1	1.4	0.4	0.0	.	0.0	.	0.7	0.2	0.4	0.1
growing stock (stemwood) 1000 m³	183	90	602	149	0	.	0	.	229	80	1013	192
growing stock (stemwood) %	0.2	0.1	0.7	0.2	0.0	.	0.0	.	0.6	0.2	0.2	0.0
growing stock (stemwood)/number of stems m³/n	1.13	0.34	0.50	0.10	0.00	.	0.00	.	0.45	0.08	0.54	0.08

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	4	2	32	11	0	.	0	.	4	4	42	12
fellings and mortality 1000 m³/yr	0	0	17	7	0	.	0	.	2	1	19	8

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