Net Ecosystem CO<sub>2</sub> Exchange of a Subalpine Spruce Forest in Switzerland Over 26 Years: Effects of Phenology and Contributions of Abiotic Drivers at Daily Time Scales.

At the seasonal level, we found a significant trend in NEE only in autumn, which indicated that the forest's net C sink increased during autumn over the 26 years of the study ( p < 0.01; Table 1 ). 3.2 Trends in Daily NEE Fluxes Over Time To assess the effects of climate change on NEE throughout the study period, we analyzed the days with the strongest net C uptake, that is, 1st, 5th percentiles of NEE c,DOY , and strongest net C loss, that is, 95th and 99th percentiles of NEE c,DOY , as well as the median NEE c,DOY during the 26‐year period (Figure S4 ).

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