Soil microbes play a key role in the functioning and nutrients cycling of ecosystem, and soil microbial parameters are commonly used as indicators of soil quality changes after revegetation of degraded lands. The dynamics processes and seasonal patterns of soil microbial biomass and activity were investigated based on a chronosequence sampling, the results showed that: soil microbial biomass carbon (MBC) and nitrogen (MBN) and basic respiration (BR) were greater in revegetation area than those in mobile sand dunes. In general, for the same soil layer, MBC, MBN and BR increased with the lapse of time after revegetation, while for the same vegetation age, they decreased with the increase of soil depth. Soil microbial metabolic quotient (qCO2) showed a declining trend as time goes on, but increased with soil depth. MBC, MBN and BR showed distinctive seasonal patterns, they were in the order: summer> autumn> spring> winter, and the amplitudes of seasonal variation increased with the plantation age, which were the results of combined effects of several environmental factors. No statistical seasonally variations were found for qCO2. In comparison with soil physiochemical properties, soil microbial biomass and the activities recovered much more rapidly, which means that microbial parameters can reflect soil quality changes after restoration of desertified regions.
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