Among them, SWC, LAI, and air temperature were significantly positively correlated with the Δ 13 C in the lower layer, and, for SWC and LAI, this correlation was highly significant.
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Carbon isotope discrimination and the factors affecting it in a summer maize field under different tillage systems.
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The sentences
In the upper layer, the CO 2 concentration and air temperature had significant positive correlations with Δ 13 C, and SWC and LAI had an extremely significant positive correlation with Δ 13 C, whereas relative humidity had a very significant negative correlation with Δ 13 C.