A decreasing trend was observed for mean δ 18 O peanut values for the three regions with Jilin > Jiangsu > Shandong, respectively. δ 18 O values of local meteoric water are mainly associated with altitude, latitude, distance from the ocean, and the rate of evapotranspiration ( Kern et al., 2020 ).
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Geographical origin classification of peanuts and processed fractions using stable isotopes.
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