Why do I always belch after drinking juice?

Not carbonated drinks, just normal juice. Not with water though, but juice, no matter what's in it.
I drink some juice from a glass, the same as I do with water, yet after juice I get a temporarily bloated feeling in my stomach and feel a pressure coming up, and out comes a big loud "juicy" belch. The "juice burps" often sound like Barney from The Simpsons.

Anyone know why this only happens when I drink juice but not water? I don't think I gulp any more air down with juice than I do with water. If I do burp after drinking water, it's less gross-sounding. But after juice it's more like an uncontrollable cartoonish belch that fills the room.
I don't make myself do it though, but it feels really good afterwards.