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• W2313426488 abstract "Soil ecological processes in cold season,particularly those associated with snow accumulation and ablation,play a central role in the structure and function of alpine forest ecosystem.With its high albedo,low thermal conductivity,large energy requirement for melting,and significant soil water input during melting,snow pack causes the surface energy balance and soil microclimate to be fundamentally important in winter in cold regions.More and more recent studies have documented that climate change may cause a decrease in snow cover,resulting in more severe soil frost and more complicated temperature variation.These studies also showed that snow pack disappear in the future remarkable affected soil water content,nutrient cycle,even the group and quantity of soil microorganisms and other ecological processes.As yet,little attention has been given to the effects of soil enzyme activities,although as the important component in soil system,they often display sensitive responses to environment changes.Therefore,in order to understand the responses of soil hydrolase enzyme activities in winter to the losing of snow pack in the scenarios of global warming,a field snow–shading experiment was conducted in a primary fir(Abies faxoniana) forest in western Sichuan.Soil invertase,urease,and phosphatase activities in soil organic layer and mineral layer were investigated under the snow pack and non-snow pack during different winter periods as snow pack formed and melted from October 19,2009 to May 18,2010.Snow pack removal significantly decreased soil urease and neutral phosphatase activities in both soil organic layer and mineral layer from the early period of snow forming to the period after snow melt.Due to the effects of soil temperature and frequently freezing and thawing,soil urease,acid phosphatase and alkaline phosphatase activities slightly increased at the early period of snow forming and the later period of snow melting,although the responses of soil enzymes to snow pack removal were different in different soil layer.Moreover,snow pack removal,soil layers,sampling time and their interaction obviously influenced the activities of soil hydrolase enzymes.According to the relationships bentween soil hydrolase enzymes(invertase,urease,acid phosphatase,neutral phosphatase and alkaline phosphatase) as well as soil temperature and the number of freeze-thaw cycles in soil organic layer,we detected that soil invertase activity was remarkably related with soil temperature and the number of freeze-thaw cycles.No significant correlation was observed between alkaline phosphatas activity and soil temperature and freeze-thaw cycles,but the activities of soil urease and acid phosphatase showed closely relationships with temperature.Although soil neutral phosphatase activity was significantly related to soil freeze-thaw cycles,soil alkaline phosphatase activity showed little relationship with temperature and freeze-thaw cycles.The results indicated that the disappear of snow pack in winter in the scenarios of global warming would significantly affect soil hydrolase activity,and then soil processes related with carbon,nitrogen and phosphorus cycling in the primary fir forest in western Sichuan,China." @default.
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• W2313426488 date "2012-01-01" @default.
• W2313426488 modified "2023-09-27" @default.
• W2313426488 title "Effects of snow pack removal on soil hydrolase enzyme activities in an alpineAbies faxonianaforest of western Sichuan" @default.
• W2313426488 doi "https://doi.org/10.5846/stxb201110131507" @default.
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