Conclusion

Ecosystem Representativeness

• The variability of the data showed limited variation when the footprint extent was taken into account, compared to the values ​​obtained when considering changes in wind speed and direction. 

• This behavior suggests that the data recorded by the Kakubari tower originated from a relatively homogeneous forest, considering that the observed variability is influenced by the atmospheric transport process rather than by the ecosystem structure itself. 

• Given that wind and turbulence conditions can influence ecosystem flow measurements, it is necessary to conduct the corresponding tests to ensure that the results obtained come from a homogeneous forest, in order to avoid compromising the research, or to perform the appropriate groupings for proper interpretation. 

Environmental Drivers

• Exploratory study with principal component analysis (PCA) revealed patterns of correlation between environmental and flow variables throughout seasons. However, as an unconstrained method, PCA was employed largely to assess data structure and guide subsequent research, rather than infer correlations between predictors and responses.

• The analysis indicates that the site's ecosystem flows are strongly associated with environmental variability, due to the high canonical correlation between predictor and response variables. 

• Among the environmental variables that contribute most to this statistical association are Vapor Pressure Deficit and air temperature, with loadings in the analysis of -0.97 and -0.59, respectively. This suggests that atmospheric conditions represent a significant component of the observed variability in the flows. 

• Variables related to water use efficiency aligned more with atmospheric variables than with productivity variables, suggesting that environmental conditions tend to coincide with the water use behavior of this ecosystem. 

• The vegetation indices analyzed showed little contribution in the multivariate analysis, which could be interpreted as meaning that canopy greenness alone does not capture the variability of ecosystem flows on a daily scale.