... D., Baudry, J., and Burel, F. ( 199 7) Field margins plant assemblages: variationpartitioning between local and landscape factors. Landscape and Urban Planning,37, 57–71.Marrs, R.H. ( 199 3) Soil ... in the 197 0s,and it was not until the Countryside Survey 199 0 (Barr et al., 199 1; Barr et al., 199 3)that more recent data has become available. These indicate that many hedges,particularly in ... sites on a spatialbasis, indicating that (1) landscape structure is having an important effect of botanicalcomposition and (2) disturbance and eutrophication (management and adjacent agri-culture)...