cycling 4 tamera

I had a look on a map today and saw, that i am on a good way, but still quite far from spain. First I went down the valley for 18 km , 18 km full of beautiful curves with amazing sceenery. Then i went up another valley, that of Rio Douro, where the grapes for the portwine grow.I had to think a lot about perma culture design this day, because this area is terrassed, and most of them are on contour, meaning build on one height line. This is one way of permaculture design, to do these terrasses, and have them end with a little mould, so that the water stays on the terrasse and here sickers into the ground. But on these terrasses the mould is missing, and instead of a colorful mixture of dense vegetation u have the rows of wine plants laid out in the blazing sun like snakes. Why does wine always stand alone ? Thee people here grow it since long centuries, why do they not use the positive effect of plant communietes, of diverse plants supporting each other ?
So i saw a landscape, which is already preshaped for an effective permaculture design, but till now dominated by wine monoculture. At the end of the day i left the wine are, with it the more dense population and the wine tourism behind and found the R15 heading to Braganca, the most north-eastern town of Portugal.