Did you even read your own link?
1) The 1,054 tonnes of Gold on that link is from 2009... the last year China actually released its holdings info.  So even though your chart says 2013... China's number is from 2009.
2) Where in your article do you see that China has bought a lot of gold?  Best guesses are they doubled to tripled their position since 2009.  So maybe about 2500-3000 tonnes at this point.  
3) As your article stated, it would take substantially more gold (about 60k tonnes) to get them enough gold to actually back their currency in a similar manner to the US.  That, as your article stated, is about 20+ years worth of worldwide production.
4) As I stated, to go to a gold standard... they need to buy a lot more gold.  That would tend to have an adverse effect upon the dollar.  That would make the US dollar worth less (not good for a country that holds a trillion dollars in our debt) and it would make Chinese exports more expensive (not good for China).  Bottom line, it does not make economic sense in any regard.  
5) That said, there is no doubt China would LIKE to be the reserve currency... every country would.  But as long as they have a lack of transparency in their government, business, etc... they will not be accepted as a replacement for the US Dollar... even if they do try in vain to back their currency with gold.