The Loobos site is located near Kootwijk on the Veluwe. The trees were planted on sand dunes and are widely spaced with some open spots. In a radius of 500 m around the flux tower 89% of the area is covered with Scots pine, 3.3% with Corsican or black pine, 2.3% with birch, 1.3% with Douglas fir, 0.6% with oak and 3.5% of the area is open and mostly covered with heather and grass. The undergrowth of the forest is a closed cover of mainly grass (Deschampsia). Because of the local topography caused by the sand dunes the distance to the ground water table depends on the location. At the base of the tower the ground water table is at a depth of ± 6.5 m below the surface. In the valleys the ground water table reaches ± 3.5 m.
| Site name | Loobos |
| Country | the Netherlands |
| Region | Veluwe |
| Latitude | 52° 09' 59.34" N |
| Longitude | 5° 44' 36.79" E |
| Elevation (m) | 25 |
| Year established | 1994 |
| Climate | Temperate / oceanic |
| Topography | flat |
| Mean annual temperature (celcius) (1996-2002) | 10.02 ± 0.93 |
| Annual precipitation (mm) (1996-2002) | 966 ± 201 |
| Annual evapo-transpiration (mm) (1996-2002) | 532 ± 54 |
| NEE (g C m-2 a-1) (1997-2010) | 422 ± 32 |
| N deposition (kg N ha-1 a-1) | 40 |
| Homogeneous fetch N-S (m) | 2000 |
| Homogeneous fetch E-W (m) | 3000 |
| Maximum flux contribution distance, unstable conditions (m) | 300 |
| Roughness lenght (m) (Dolman, 2002) | 2.05 |
| Zero displacement height (m) (Dolman, 2002) | 9.9 |
| Prevailing wind direction | W - SW |
| Dominant tree species | Pinus sylvestris (89%) |
| Other tree species | 3.3% Corsican pine, 2.3% birch, 1.3% Douglas fir, 0.6% oak and 3.5% open area |
| Year of planting | around 1910 |
| Tree height (m) (2012) | 18.6 |
| Tree DBH (m) (2012) | 0.293 |
| Tree density (tree ha-1) (1999) | 403 |
| Standing biomass (kg m-2) (2012) | 10.89 |
| Standing biomass increment (kg m-2 a-1) (aboveground, 1996-2008) | 0.124 |
| Wood density (kg dm-3) (1997) | 0.4505 |
| Stem volume (m3 ha-1) (2002) | 166 |
| Stem volume increment (m3 ha-1 a-1) (1997) | 2.49 |
| Stem area index (m2 ha-1) (1997) | 24.4 ± 10.2 |
| Standing leaf biomass (kg m-2) (1997) | 0.302 |
| Leaf litter production (gC m-2 a-1) (2001-2010) | 255 ± 65 |
| LAI trees (m2 m-2) min./max. | 1.7 - 2.2 |
| LAI trees average (m2 m-2) (Dolman, 2002) | 1.9 |
| LAI undergrowth (m2 m-2) min./max | 0.0 - 1.1 |
| Canopy Projected Area (m2 tree-1) | 15.4 |
| Leaf C/N (kg kg-1) | 30.4 |
| Specific leaf mass (SLM, kg m-2) (1997) | 0.220 |
| Specific leaf area (SLA, m2 kg-1) (1997) | 4.70 |
| Bark width at DBH (cm) (1997) | 1.5 |
| Bark density (kg dm-3) (1997) | 0.3903 |
| Needle lenght (mm) (1997) | 51.0 |
| Needle weight (mg) (1997) | 15.7 |
| Needle area/lenght (mm2 mm-1) (1997) | 1.37 |
| Soil Classification | Orthidystric rubic Arenosol |
| Sand volume fraction 0 - 0.2 m | 0.53 |
| Sand volume fraction 0.4 - 0.6 m | 0.60 |
| Clay volume fraction 0 - 0.2 m | 0.01 |
| Clay volume fraction 0.4 - 0.6 m | 0.01 |
| Organic matter volume fraction 0 - 0.2 m | 0.02 |
| Organic matter volume fraction 0.4 - 0.6 m | 0.0 |
| SOM C litter layer (kg m-2) | 5.33 ± 0.44 |
| SOM C 0-30 cm (kg m-2) | 2.43 ± 0.20 |
| SOM N litter layer (kg m-2) | 0.20 ± 0.015 |
| SOM N 0-30 cm (kg m-2) | 0.097 ± 0.007 |
| Litter layer (cm) | 11 |
Dolman,A.J., Moors, E.J., Elbers, J.A. (2002). The carbon uptake of a mid latitude pine forest growing on sandy soil. Agric. and Forest. Met., 111 (3) : 157-170.
Jan A. Elbers, Cor M.J. Jacobs, Bart Kruijt, Wilma W.P. Jans, Eddy J. Moors (2011). Assessing the uncertainty of estimated annual totals of net ecosystem productivity: A practical approach applied to a mid latitude temperate pine forest, Agricultural and Forest Meteorology, Volume 151, Issue 12, 15 December 2011, Pages 1823-1830.