Fig. 1 – (a) Experimental set-up for the alley cropping system in the Lusatian lignite-mining district (not full-scale). Capital
letter indicate tree species/clones (A: Poplar clone Androscoggin, H: Poplar clone Hybride 275, S: Willow, R: Black locust.
Numbers indicate rotation period in years (3, 6 and 9). (b) Planting scheme of the hedgerows at the Lusatian study site.