SECONDARYSUCCESSIONAL STAGES OF SOIL NEMATODES IN CAMBISOLS OF SOUTH BOHEMIA BY L. HÁN � L Institute of Soil Biology, Academy of Sciences of the Czech Republic, Na sádkách 7, 370 05 � eské Bud � jovice, Czech Republic The secondarysuccession of soil nematode communities from cultivated field
compared soil nematode communities of two secondarysuccession stages after deforestation, i.e. , shrub-grassland (early successional stage) and secondary forest (late successional stage), with those of virgin forests. By applying nematode community indices, the aims of this study are: i ) to identify
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A sowing experiment was conducted to investigate whether and how secondary succession affects the establishment success of Quercus calliprinos, a leading species of East Mediterranean maquis. Acorns of Q. calliprinos were sown at equivalent densities in experimental plots representing three different stages of the succession: open patches (gaps) dominated by annual plants, patches of low woody vegetation dominated by the early-successional dwarf shrub Sarcopoterium spinosum, and patches of mature Q. calliprinos trees. These patch types represent early, middle, and late stages of the succession. Seedlings that emerged in the experimental plots were monitored for survival and growth during two successive years. Seedling emergence was lowest beneath the canopy of Q. calliprinos trees (2%), intermediate in patches of S. spinosum (54%), and highest in gaps (85%). Seedling survivorship exhibited an opposite pattern: 67% beneath the canopy of Q. calliprinos trees. 43% in patches of S. spinosum, and only 4% in gaps. The combined probability of pre-emergence and post-emergence survival was 23% in patches of S. spinosum, 3% in closed-canopy patches, and 1% in gaps. These results indicate that (I) secondary succession may have considerable effects on the establishment success of Q. calliprinos in Mediterranean maquis, and (2) post-emergence death of Q. calliprinos seedlings may modify patterns of establishment generated by earlier germination and emergence responses. The significance of these results for the natural dynamics and management of maquis dominated by Q. calliprinos is discussed with respect to the concepts of “regeneration niche” and “succession models”.
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Evenari M. Gutterman Y. Observation on the secondarysuccession of three plant communities in the Negev desert, Israel. I. Artemisietum herbae
humid; the average annual rainfall is 2000 mm (Peel et al., 2007 ). The studied areas encompass ecosystems that, in terms of physical characteristics and anthropogenic disturbances, are representative of the region: Native Vegetation (NV), Mature Secondarysuccession (MS: vegetation with 15 years of
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Evenari M. Gutterman Y. Observations on the secondarysuccession of three plant communities in the Negev Desert, Israel I. Artemisietum herbae-albae. Etudes de Biologie Vêgétale
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Evenari M. Gutterman Y. Observations on the secondarysuccession of three plant communities in the Negev desert, Israel. I