Table S3 Summary of observed net ecosystem exchange at
AmeriFlux sites divided into low
(k d<0.35) and high
(k d>0.65) k dregimes for different bins of absorbed shortwave radiation at the
surface (K abs). Differences in net ecosystem
exchange between the regimes that are statistically significant
(p<0.01) are in bold and cases where not enough data are
available to perform (a) two-tailed t-test are in grey.