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Fig. 4. Model-predicted root + rhizosphere respiration (Rrrh) in a maize field in Ontario, shown in relation to soil temperature. Each point represents a single days data. The two variables are not correlated (linear regression, n = 18, r2 = 0.05, P = 0.36). The relationship between predicted and isotopically determined Rrrh is shown in Fig. 3.
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