Forest decline and tree defoliation | Environmental indicators

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The health condition of forests in Slovenia has been relatively stable in recent years, despite slight negative trends. In 2014, individual areas in Slovenia were affected by severe icing and later by, Bark beetles which is also reflected in the data collected at the national level. Among the most damaged tree species are spruce, oaks, fir, ash and home-grown chestnut. According to recent findings, annual fluctuations in estimates are primarily a combination of the consequences of changing weather conditions between years and other biotic and abiotic stressors.

Charts

Figure GZ01-1: Trend in average tree defoliation

Sources:

Source: Slovenian Forestry Institute, 2017

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	coniferous [%]	deciduous [%]	total [%]
1991	22.14	12.95	16.56
1993	22.46	15.68	19.59
1994	18.53	16.30	18.29
1995	26.86	18.07	21.42
1996	22.80	15.95	18.69
1997	24.69	20.49	22.21
1998	27.37	20.49	23.49
1999	28.65	21.87	25.62
2000	24.32	18.15	20.56
2001	25.90	21.46	24.62
2002	26.11	20.78	24.16
2003	25.13	20.75	23.56
2004	24.98	20.93	23.27
2005	24.99	22.21	23.47
2006	24.60	22.60	23.30
2007	24.56	25.87	25.37
2008	26.02	25.42	25.65
2009	26.36	25.86	26.05
2010	25.13	24.48	24.71
2011	25.95	23.81	25.45
2012	25.78	23.36	24.91
2013	26.14	24.46	25.87
2014	27.72	27.14	28.21
2015	29.69	26.30	28.08
2016	28.52	25.71	26.70

Export Table Data

Figure GZ01-2: Trend in shares of damaged trees with defoliation above 25% (index of tree defoliation)

Sources:

Slovenian Forestry Institute, 2017

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	coniferous [%]	deciduous [%]	total [%]
1991	26.40	9.35	15.57
1993	25.28	12.45	18.87
1994	16.35	13.00	15.69
1995	37.75	17.63	24.71
1996	27.52	12.62	18.94
1997	31.06	20.34	27.03
1998	38.87	21.72	28.81
1999	41.97	22.77	30.62
2000	30.32	16.86	22.28
2001	36.11	24.53	30.41
2002	41.49	24.36	30.85
2003	36.73	23.76	29.27
2004	40.51	23.67	29.27
2005	35.08	28.49	30.59
2006	32.20	27.80	29.40
2007	36.60	35.70	35.70
2008	40.74	34.56	36.90
2009	39.07	32.78	35.42
2010	42.79	23.23	31.72
2011	37.87	27.62	31.40
2012	37.03	23.01	29.04
2013	34.31	28.47	30.87
2014	39.95	34.90	38.29
2015	44.33	32.75	37.81
2016	41.89	31.31	33.81