The original ''Daphnis and Chloe'' is quite an early work, the only known fictional work, or novel, by the Greek writer Longus, who probably lived in the 2nd century AD. As I am sure you've probably read it or are reading it, I shan't give a summary of the story here; but you'll probably know it is a love story?
Nature, and its 'effect' or 'impact' is felt , in the literal sense, in rather oblique ways, in this work. Briefly:
1. From the start both Daphnis and Chloe are left at the mercy of Nature, and discovered/found by some rustic shepherds, who live in the woods and fields, close to Nature/the natural environment, amongst sheep and other creatures.
2. Both the hero and heroine i.e. Daphnis and Chloe, are raised, brought up, close to Nature, in natural and bucolic surroundings and learn all that they know from Nature and the woodlands and fields and the animals and other people and creatures inhabiting these. They are in this respect 'primitive' and 'innocent'.
3. Whilst in Nature, by and large their love story proceeds well, but they are threatened or misled by the 'urbs' the urban environment or people from towns/cities who also try to corrupt and pollute the lovers in various ways. Thus a 'removal' from Nature/the natural world, is bad or negative for them; and a return to this, good.
4. When Chloe is abducted by her suitors, it is again Nature, and the wilds, or woodlands, personified in the form of the deity or god of forests and fields, Pan, who comes to her rescue and saves her. Thus, for its 'innocent ones' , its lovers and children, Nature is loving and sympathetic, helpful.
As far as Romance is concerned, this being an obvious love story, 'romantic' elements of various types are found at various levels, primarily (a) in , of course, the early and innocent love of Daphnis and Chloe, who mature and 'learn' about each other, in both physical and spiritual terms, within Nature and in 'natural' and spontaneous ways (b) a [corruption' of innocence and a 'negative romancing' is also implied and/or shown in the story, i.e. via the influence of people who lust after Daphnis and Chloe (i.e. lust is counter-poised to love) and whom they must ultimately escape or avoid, to fid their own ultmate, personal fulfilment.
I am sorry, seem to have missed out the other link, some problems with these. It is given below again.