Pan-Arctic soil moisture control on tundra carbon sequestration and plant productivity.

After removing the influence of soil moisture on the GPP vs GDD relationship (e.g., by regressing the residuals of both the correlation between GPP and soil moisture, and GDD and soil moisture), there was only a marginally significant difference between the polynomial and linear models explaining the relationship between the residuals of GPP and the residuals of GDD in the partial correlation analysis ( p = .054).

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Beyond the site scale, drier conditions have been associated with the lack of a positive trend in the minimum late summer atmospheric [CO 2 ] (a proxy of photosynthetic CO 2 uptake) in northern ecosystems since the 1990 s (Angert et al., 2005 ).

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