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- W2799907376 abstract "Cryptogams, a neglected segment in vegetation dynamics, can form a large part ofbiomass in sandy grasslands. Since the pioneer work of Verseghy (early 1970s) theirbiomass and productivity has not been analyzed in Hungary. We intended to contributeto the knowledge of dynamics of cryprogams in dry acidic grasslands. Study objectswere permanent plots in endangered open sandy grasslands ‘Pannonic inland dunes’(EU Habitat Directive, 2340). Vegetation of CORYNEPHORETUM CANESCENTIS (CC) andFESTUCETUM VAGINATAE (FV), characteristic vegetation types of the Nyirseg region (NEHungary) has been monitored in grazed and experimentally fenced stands. Fencing wasused to model the overall trend of falling stocking densities. Biomass of cryptogams hasbeen sampled in 2013, five years after grazing exclosure then hand-sorted into species.Morphological studies, spot tests and HPTLC have also been applied to identify criticallichen taxa.Fencing has led to an increased biomass of cryptogams. Biomass of mosses exceededthose of lichens irrespective of the community or management. Cryptogamic biomasstended to be lower in CC than in FV and lower in grazed stands compared to fencedones. Most frequent cryptogams (Brachythecium albicans, Cladonia rangiformis, C. rei,Polytrichum piliferum) have been supported by exclosure. Lichens benefitted relativelymore from exclosure than did the mosses. The only lichen favoured by moderategrazing has been Cladonia magyarica.Soil traits (pH, organic material, P2O5) had contrasting effects on biomass fractionsunder different management (Spearman’s rank correlation). More significantcorrelations have been revealed in fenced stands than in the grazed ones. FV had morecorrelations than the CC. The few strict correlations included preference of Syntrichiaruralis for higher while that of Polytrichum piliferum for lower pH values. Lowphosphorous content has been positively correlated with Cladonia rangiformis,Polytrichum piliferum, total moss and total of cryptogams while higher values onlysupported Brachythecium albicans. This suggests more organized assemblages inungrazed stands and in the FV, respectively. Compared to soil traits microtopographyhad a minor effect on cryptogam distribution. Initial establishment pattern or randompatch formation seem to be as important as all above-mentioned factors together.Long-term grazing exclosure is likely to promote further spread of the dominants,Cladonia rangiformis and Polytrichum piliferum. Short spells of grazing are likely topromote cryptogam biodiversity.Chemical analyses have been supported by OTKA K81232 and NKFIH K_17/124341." @default.
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- W2799907376 date "2017-01-01" @default.
- W2799907376 modified "2023-10-06" @default.
- W2799907376 title "Mosses and lichens in dynamics of acidic sandy grasslands: specific response to grazing exclosure = Mohok és zuzmók legelelés kizárásra adott válasza savanyú homoki gyepekben" @default.
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