Haven't read it in detail but if your destination requires an alternate, wouldn't you be some sort of IFR operation? Given ALAs are generally just cleared bits of land to plonk on to, how could you use one as an alternate? No Forecast? No Notam Service?
Have a read of it in detail. It says:
If, as a result of an in-flight fuel quantity check in accordance with subsection 5 (2), the usable fuel expected to be remaining on arrival at the destination aerodrome is less than the fixed fuel reserve (where no alternate aerodrome is required), then the pilot in command must take appropriate action and proceed to an en-route alternate so as to perform a safe landing with not less than the fixed fuel reserve remaining'
and
en-route alternate means an alternate aerodrome at which an aircraft would be able to land in the event that a diversion becomes necessary while en-route.
This means that if you are flying along VFR or IFR and say due to head winds are going to eat into your 45 minutes fixed reserve even if only by a liter you must divert to an alternate aerodrome.