Seasonality alters drivers of soil enzyme activity in subalpine grassland soil undergoing climate change

摘要: Abstract In mountain ecosystems with marked seasonality, climate change can affect various processes in soils, potentially modifying long-term key soil services via organic carbon (C) storage. Based on a four-year transplantation experiment Swiss subalpine grasslands, we investigated how imposed warming and reduced precipitation modified the drivers of enzyme potential activities across winter summer seasons. Specifically, used structural equation models (SEMs) to identify biotic (microbial community structure, abundance activity) abiotic (quantity quality matter resources) C-enzymes (hydrolase oxidase) two seasons under different scenarios. We found contrasting impacts manipulation between summer. winter, no direct effect (reduced rainfall warming) activity was observed. Yet, indirectly down-regulated through decrease availability water extractable (WEOC) labile resources. During summer, moisture –induced by manipulation– directly microbial biomass, which led C-enzyme activity. general, both seasons, neither nor were strong determinants enzymatic particular recalcitrance (aromaticity) not as general driver either hydrolase or oxidase activities, though did observe higher an increase particulate season. Overall, our results highlight seasonality effects decomposition, providing comprehensive picture seasonal cause relationships governing C mineralization grasslands.