Rosinedal Scots Pine Forest, Sweden

The mature Pinus sylvestris (PS) forests in Rosinedal, Sweden, (64°10′ N, 19°45′ E) were regenerated with seed trees in 1920–1925, pre- commercially thinned in 1955, and thinned in 1976 and 1993, respectively. These forests have been used for long-term fertilization experiment with control (PSMC) and fertilized (PSMF) stands located ~2 km apart. The area of each stand is ~15 ha, and there is a flux tower in the center of each stand. Fertilizer of 100 kg N·ha−1·yr−1 was applied to PSMF from 2006 to 2011 and a reduced rate of 50 kg N·ha−1·yr−1 has been used afterwards . The young, regenerating P. sylvestris forest (PSY) was in Åheden (~7 km from Rosinedal).

The understory of both stands is characterized by a field layer of dwarf shrubs, (Vaccinium myrtil lus and V. vitis-idaea) and a ground layer of mosses (Pleurozium schreberi and Hylocomium splendens) and lichens. These forests share similar soil texture of well-drained, deep sandy sediment with 2–5 cm soil organic layer and bulk density and porosity (in the top 10 cm) of 1230 kg/m3 and 0.49. The 30-year mean annual temperature and precipitation (1981–2010), measured at the Svartberget field station (8 km from PSMC and 1 km from PSY) were 1.8°C and 614 mm, respectively. On average, the area is covered by snow from early November to late April.

Eddy Flux Tower at the research station in Rosinedal. This is the unfertilized Scots Pine plantation. First experiments within ‘Isodrones’ have been conducted here between May-August 2018.