A Delta H-2 Isoscape Of Blackberry As An Example Application For Determining The Geographic Origins Of Plant Materials In New Zealand

PLOS ONE(2019)

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摘要
In this investigation, two previously reported precipitation delta H-2 isoscapes for New Zealand were used to develop a delta H-2 isoscape for blackberry (Rubus sp.) leaf. These isoscapes were calibrated using the measured delta H-2 values of 120 authentic blackberry leaf samples collected from across the country. A regression model based on environmental variables available for New Zealand was also determined to predict delta H-2 values measured from blackberry leaves without initially modelling the precipitation delta H-2 values. The three models were compared for their accuracy and precision when assigning 10 samples of blackberry leaves for their geographic location based on their measured delta H-2 values. One of the models based on a precipitation isoscape was similar in accuracy and precision of assignment to the model determined from the environmental variables and provides an approach for determining valid isoscapes for future plant materials.
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