¹⁵N Natural Abundance of C3 and C4 Herbaceous Plants and Its Response to Climatic Factors along an Agro-Pastoral Zone of Northern China.

The regression analysis of δ 15 N values of C3 and C4 herbs and MAT led to a correlation that was extremely significant ( p < 0.001), but the temperature only explained 30.12% (C3 herbs) and 32.48% (C4 herbs) of the observed variation ( Figure 5 c,d), demonstrating that there was no significant difference in the responses of δ 15 N value of C3 and C4 herbs to temperature.

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The mean annual precipitation (MAP) ranges between 345 mm and 443 mm and the mean annual temperature (MAT) varies from −6.1 °C to 8.9 °C, with a decreasing trend from northeast to southwest [ 29 ].

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This means that δ 15 N signature of herbs has a limited indicative significance for the variation in precipitation across the study region.

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