Behind the earthly king, Solomon saw the Lord God. If praise came to Song of Solomon , even more credit should go to the God of Israel for enabling the king to exercise such a marvelous reign. Solomon acknowledged God"s sovereignty by appealing to Him for the personal equipment he needed to rule justly ( Psalm 72:1-11). He also did so by attributing blessing to the Lord here at the end of the psalm. [source][source][source]
This closing benediction is a doxology similar to the one that ended Book1of the Psalter ( Psalm 41:13). Probably the editors of the collection of psalms placed Psalm 72here because of this doxology and because the whole theme of this psalm is so positive, optimistic, and God-honoring. [source][source][source]