Soil and forest floor respiration already acclimated to increasing temperatures in a mixed deciduous forest.

Background: Forest ecosystems are in the spotlight for their potential to mitigate anthropogenic carbon dioxide (CO) emissions through net photosynthesis. However, this mitigation potential can be counteracted by respiratory losses, e.g.

Net Ecosystem CO Exchange of a Subalpine Spruce Forest in Switzerland Over 26 Years: Effects of Phenology and Contributions of Abiotic Drivers at Daily Time Scales.

Climate change affects carbon sequestration dynamics and phenology in forests, especially in alpine and subalpine regions. Here, long-term trends in climate, net ecosystem CO exchange (NEE), net carbon uptake period (CUP) and their drivers were investigated, using 26 years of flux measurements in a subalpine spruce forest (CH-Dav, Switzerland; 1997 to 2022). CUP length, start (SOS) and end of season (EOS) were extracted from smoothed daily NEE time series.