AGRICULTURAL IMPACT ON LINEAR VEGETATION FORMATIONS - SPECIES RICHNESS, STAND TROPHY, AND PLANT STRATEGIES

Ruderalization of line corridors was studied on the basis of species r ichness (S), nitrogen indicator values (I-N) and life strategies of do minant plant species in an agricultural landscape of Central Bohemia, The Czech Republic. A negative correlation between S and I-N was found . These values seemed to be correlated with the life strategy characte ristics of the dominant plants in a particular corridors. Corridor sec tions dominated by ruderals had the highest I-N values ((x) over bar = 6.89) and the lowest S values ((x) over bar = 25). Stands of (semi)na tural vegetation dominated by C-S and C-S-R strategists were richest i n species ((x) over bar = 32) and their I-N values were lowest ((x) ov er bar = 6.41). The level of ruderalization corresponded to N-leaching from adjacent fields.