How is nature presented in the poem 'To Autumn'?

Nature is presented in all its bounty and fruitfulness in John Keats's mellifluous ode.

It is of particular note that in the second stanza in which Keats describes all of nature's gifts, he creates the image of a young woman "sound asleep" from her labors, who

...sometimes like a gleaner thou dost keepSteady thy laden head across a brook;

While many of the harvest laborers were young women in England in the 1800's, there...

Nature is presented in all its bounty and fruitfulness in John Keats's mellifluous ode.

It is of particular note that in the second stanza in which Keats describes all of nature's gifts, he creates the image of a young woman "sound asleep" from her labors, who

...sometimes like a gleaner thou dost keep
Steady thy laden head across a brook;

While many of the harvest laborers were young women in England in the 1800's, there is, perhaps, the metaphoric suggestion that Nature is like a woman who nurtures her unborn baby most of a year and then the "fruit" of her womb is produced later. So, too, does Autumn yield the fruits and products of its earlier growing months, and the richness of Nature is bountiful in its production in this season. 

Connotations of birth are in the first stanza with the words "ripeness," "sweet kernel" and the phrase "swell the gourd"; then later there are "flowers for the bees."

Certainly, Keats' lyric ode paints a rich, and enduring tableau of what he depicts as Nature's richest season, the season that brings forth all the fruits and grains and mellow bounty.