Fig. 2From: NFIWADS: the water budget, soil moisture, and drought stress indicator database for the German National Forest Inventory (NFI)Comparison between mean annual discharge (F) as the sum of drainage (D) and surface runoff (R) (1981–2010) for beech (a) and spruce (b), computed with the TUB-BGR method and LWF-BROOK90Back to article page