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世界上種(zhong)(zhong)植(zhi)的(de)(de)油(you)(you)(you)(you)桐(tong)有(you)(you)6種(zhong)(zhong)，以原產(chan)我國(guo)的(de)(de)三(san)年(nian)桐(tong)和千年(nian)桐(tong)為普遍。油(you)(you)(you)(you)桐(tong)屬大戟科(ke)，落葉喬木。三(san)年(nian)桐(tong)學名(ming)油(you)(you)(you)(you)桐(tong)，長得(de)快，結果早，產(chan)量高，盛果期可達20年(nian)～30年(nian)。千年(nian)桐(tong)學名(ming)木油(you)(you)(you)(you)桐(tong)，因果皮有(you)(you)皺紋，又稱龜(gui)背桐(tong)，寓(yu)意長命百歲(sui)。千年(nian)桐(tong)比三(san)年(nian)桐(tong)高大，有(you)(you)10多(duo)米，樹(shu)(shu)齡較長。中(zhong)國(guo)較大的(de)(de)一(yi)株(zhu)油(you)(you)(you)(you)桐(tong)樹(shu)(shu)，在福建省(sheng)漳浦縣石(shi)榴公社。這株(zhu)千年(nian)生(sheng)的(de)(de)油(you)(you)(you)(you)桐(tong)樹(shu)(shu)，樹(shu)(shu)高36 米，冠幅36.5 米，平均每年(nian)結果2000 多(duo)斤，可榨(zha)桐(tong)油(you)(you)(you)(you)100多(duo)斤，素有(you)(you) “油(you)(you)(you)(you)桐(tong)王”之稱。油(you)(you)(you)(you)桐(tong)種(zhong)(zhong)子榨(zha)出(chu)的(de)(de)油(you)(you)(you)(you)叫桐(tong)油(you)(you)(you)(you)；木油(you)(you)(you)(you)桐(tong)種(zhong)(zhong)子榨(zha)出(chu)的(de)(de)油(you)(you)(you)(you)叫木油(you)(you)(you)(you)，質量稍遜。

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