Corumayas wrote:
Sal: I guess what I really need to know for my own purposes, climate-wise, is what the lower Aiwa and adjacent regions (e.g. the coastal plain and piedmont areas north of it) are like... for example, is the delta too wet for wheat? Is irrigation needed for farming in any part of the region? Is wood abundant, or would it need to be imported from higher ground? And so on.
Wheat: haven't a clue. If anything, might be too wet for wheat, which I guess must have limits. Irrigation? Depends what farming you want.
I don't think we need cleave perfectly to earth's crops. I would hazard that the lower Aiwa is very fertile, temperate in climate, and wet, so some form of cereal crop ought to be possible - if that's what we want the staple to be. I shouldn't have thought irrigation would be necessary, although obviously there will be areas that aren't great for cereals - but if we wanted irrigation we could just change the crop. Or indeed the geology, which plays just as large a part in these things. As an extreme, the entire plain could be permeable, with rivers running in deep gorges and the rest of the plain entirely barren grassland, or even a rainfall-rich desert....
Trees: looking at it, it seems there's three major options. First, monsoon forest. I think that with the latitude and the coastline that's unlikely to be too big - perhaps a coastal 'florida' region. Second, temperate broadleafed forests. This seems most likely. However, a third option (my favourite, but I'll not fight the consensus) would be pampas. It seems the pampas that you get in argentina in places where there should be forest is a result of geology - the soil is too compact, and not airy enough, for forest.
If the valley were mostly pampasy, there would be trees along watercourses and elsewhere it would be grass - but thick deep grass, and very fertile for crops. Additionally, we could easily say that certain areas of the valley did not share that soil type, allowing us to plonk forests down in areas that are not climatically that different.
There are also two other possibilities. One is tropical dry forest - but we're probably too far north, so I'd say Xshalad for that. The other is mediterranean - which for some reason occurs in Gilan and Colchis. Don't know why. Probably not applicable.