Location: NW Pennsylvania Zone 5B bordering on Zone 6
posted 4 years ago
I remember coming across that sometime too. I think Geoff Lawton mentioned something about it. Something like for every 1 degree of increase in slope is like gaining 1 degree of latitude, for a surface facing the equator (obviously facing south for those of us in the northern hemisphere). I could be wrong, but that seems to stick with me.
"Turn your face to the sun and the shadows fall behind you." ~Maori Proverb
(my first post after being a lurker for a longish while)
this is something I have wondered about now and then (while quite happy that I have a good south facing slope on my land). I have wondered especially how valid this sort of comparison is, and the assumptions that are being made. For instance, after reading Elliot Coleman's Winter Harvest Handbook I have developed a deeper appreciation of the role of shelter from wind in affecting the hardiness and productivity of plants; A slope might give a boost in some aspects of solarenergy received, but what about the importance of air temperature (which will depend on a lot of factors at the local site, but will surely not be equivalent to x hundred miles south by virtue of being above a south facing slope!) and how it is affected by wind (e.g., wind-chill).
If anyone knows of a good article/other source that explores this I would be keen to follow it up.
I am in the process of designing some shelter for veg beds on a south-facing slope that will allow me to offer protection from the wind while benefiting from the solar gain offered by the slope - and it can be quite a windy site! I guess it comes down to micro-climate!
Location: In a rain shadow - Fremont County, Southern CO
posted 4 years ago
i thought i heard Geoff mention that higher altitude makes the site conditions more/less hot, but that continental effect (distance from a major sea or ocean) had an effect also.
for me, im a long way from the ocean; thus i have a large continental effect, so i will generally have higher highs and lower lows than someone that is closer to the ocean.
i am also ~5300 ft up. Geoff mentions that every 100m (~325 ft) can effect the site similar to moving south 1* (warmer) in summer and 1* north (colder) in winter
basically saying that altitude amplifies the continental effect is how i took it.
this was from the online PDC videos. probably around disk 7-8 if i remember correctly.
i thought the slope had to do with what type of planting it received (slope stabilizing, food forest, fuel wood etc).
http://www.cloud9farms.com/ - Southern Colorado - Zone 5 (-19*f) - 5300ft elevation - 12in rainfall plus irrigation rights
Dairy cows, "hair" sheep, Kune Kune pigs, chickens, guineas and turkeys
Mo-om! You're embarassing me! Can you just read a tiny ad like a normal person?
It's like binging on 7 seasons of your favorite netflix permaculture show