Transit visa required???

Hi, I´m a Portuguese national holding a Portuguese passport and I´m planning to go to Portugal from Australia where I live with China Southern. The trip begins in Melbourne with transit in Guangzhou by +/- 3 hours, then Amsterdam and finally Lisbon. The opposite path on return about 15 days later.
The question is as follows: do I need a visa for these two short transit periods, on going and return?
Thanking in advance,
Best Regards
Jose Pais