What is the meaning of Douguan's final reading of the monologue

This monologue is a monologue read by his son Douguan after the death of Jiu'er, the heroine of Red Sorghum, and is called "Niangniang on the Southwest": "Niangniang on the Southwest, the wide continent, the long treasure ship". Niangniang went to the southwest, the wide continent, the long treasure ship. You will find a sweet place to live and a bitter place to turn into money. Go to the southwest, Mother, to the wide continent, to the long treasure ship. Go to the Southwest, Mother, with your horse and your money. The mother went to the southwest, you sweet place to settle down, you bitter place to turn into money.

In fact, this piece of work reflects the custom of Shandong Province. In terms of traditional culture, the southwest is the gate of death in Qi Men Dun Jia, which means sending off the dead. The road has no earthly suffering, there are horses on the road, there are boats and coils, let her go all the way. For the deceased to indicate the direction of the soul to go after death, but also a kind of people's memory of the dead and wishes.

This is a Shaanxi folk ballad, a sort of guiding meditation, usually sung by her children after the death of the mother, containing the children's good wishes for their departed mother.