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The relationship between vowel formants and the second subglottal resonance (Sg2) has previously been explored in English, German, Hungarian and Korean. Results from these studies indicate that vowel space is categorically divided by Sg2 and that Sg2 correlates well with standing height. One of the goals of this work is to verify if the above findings hold true in Mandarin as well. The correlation between Sg2 and sitting height (trunk length) is also studied. Further, since Mandarin is a tonal language (with more pitch variations compared to English), we study the relationship between Sg2 and fundamental frequency (F0). A new corpus of simultaneous recordings of speech and subglottal acoustics was collected from 20 native Mandarin speakers. Results on this corpus indicate that Sg2 divides vowel space in Mandarin as well, and that it is more correlated with sitting height than standing height. Paired t-tests are conducted on the Sg2 measurements from different vowel parts, which represent different F0 regions. Preliminary results show that there is no statistically-significant variation of Sg2 with F0 within a tone.