After an early phase of experiments with exotic tree species, forestry efforts largely focused on protecting birch woodland remnants during the first half of the 20th century, with several forest areas being acquired by the IFS for that purpose. They, along with more recently acquired afforestation areas comprise the National Forest system today. Protection entailed enclosing the woodland areas in a fence to exclude sheep, a practice still necessary today for all afforestation areas, due to uncontrolled summer grazing.
From 1950 to 1990, a great deal of experience was gained through experimenting with different exotic species and provenances. It soon became clear that scientific research was essential to progress in identifying the best species and provenances and developing afforestation methods. The IFS initiated research and established a research station in 1967 with aid from Norway.
Afforestation through planting increased again to roughly 4 million seedlings annually throughout most of the 1990s, reaching a high of about 6 million seedlings per year during 2007-2009. Planting of native birch increased proportionate to the total, comprising as much as 30% of seedlings planted in some years. Larix sukaczewii (syn. L. sibirica var. sukaczewii) was planted to roughly the same extent and planting of Picea sitchensis increased as older stands showed very good growth.
Public funding for forestry reached a maximum in 2005, after which it started to wane slightly in real terms (rated against inflation). After the financial crisis of 2008-2009, funding for forestry was cut drastically. In real terms, public funding for forestry in 2013 was only half of what it was 2005. This resulted in a drastic reduction in planting, down to about 3 million seedlings in 2015. Among the consequences were tree nurseries going out of business and educated foresters moving abroad to find work.
On the other hand, the collapse of the Icelandic Krona meant that wood imports became much more expensive, providing opportunities for greater use of domestic wood. Plantations from the 1950s-´70s were in need of thinning and had been for some time. Now for the first time there was a possibility that thinning could be economically sustainable. Thinning and timber sales by the IFS increased greatly in 2009 and continued to increase during the following years. Since then, timber production from thinnings has become a new, major activity within the Icelandic forestry sector.
Historically, there have been three relatively short-lived upswings in forestry in Iceland with longer periods of less activity in between. The upswings were the beginnings of forestry 1899-1908, the beginnings of planting 1950-1963 and the recent increase in afforestation 1990-2009. The causes of the current decline are partly financial and partly social, both of which translate into less political support for forestry. If history is any indication, we might be in the early years of a period of less forestry activity that could last 30-40 years. Despite rapid economic recovery in Iceland during 2014-2016, funding for forestry has only increased slightly. However, Iceland now has a developing commercial forest resource that is already starting to generate significant income. That income should spur interest in investing in forestry, hopefully resulting in a shorter downswing. Other factors, such as increased afforestation for carbon sequestration could also aid in revitalising forestry, but that hasn't happened yet despite 20 years of talking about it.