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Fluctuations in wetland hydrology create an in- terplay between aerobic and anaerobic conditions, control- ling vegetation composition and microbial community struc- ture and activity in wetland soils. In this study, we inves- tigated the vegetation composition and microbial commu- nity structural and functional changes along a wetland hy- drological gradient. Two different vegetation communities were distinguished along the hydrological gradient; Carice- tum gracilis at the wet depression and Arrhenatheretum ela- tioris at the drier upper site. Microbial community structural changes were studied by a combined in situ 13 CO2 pulse la- beling and phospholipid fatty acid (PLFA) based stable iso- tope probing approach, which identifies the microbial groups actively involved in assimilation of newly photosynthesized, root-derived C in the rhizosphere soils. Gram negative bac- terial communities were relatively more abundant in the sur- face soils of the drier upper site than in the surface soils of the wetter lower site, while the lower site and the deeper soil lay- ers were relatively more inhabited by gram positive bacterial communities. Despite their large abundance, the metaboli- cally active proportion of gram positive bacterial and actino- mycetes communities was much smaller at both sites, com- pared to that of the gram negative bacterial and fungal com- munities. This suggests much slower assimilation of root- derived C by gram positive and actinomycetes communi- ties than by gram negative bacteria and fungi at both sites. Ground water depth showed a significant effect on the rela- tive abundance of several microbial communities. Relative abundance of gram negative bacteria significantly decreased with increasing ground water depth while the relative abun- dance of gram positive bacteria and actinomycetes at the sur- face layer increased with increasing ground water depth.

Vegetation composition and soil microbial community structural changes along a wetland hydrological gradient