The six ft four ins Ambler, who turns 19 this week, has joined the Rhinos on two-year contract after the clubs agreed a £12,000 fee.
Leeds coach Brian McClennan said: "Luke is a young prop who will develop well in our system alongside senior players like Jamie Peacock and Kylie Leuluai."
Ambler will be part of the Rhinos' first team squad for the Festive Challenge game against Wakefield at Headingley on Boxing Day.
"I am very pleased to be joining the Rhinos," he said. "I have spent the last three years at Salford but only played one game in the first team. Hopefully, I can repay the faith the club have shown in signing me."
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greyhound, Bolton,Lancashire (16/12/2008 at 11:05)
The very best of luck to young Ambler with the Leeds Rhinos in 2009.