How does water harvesting (at landscape level) impact micro-climate?

I hope to gather more evidence and suggestion on the links between intense water harvesting/water shed activities on microclimate - because as a landscape becomes more moist temperature peaks are affected, nitrogen fixation by soil biota accelerated, soil temperature changed with different measures having different impacts. This raises questions on how microclimate can address changes in the macroclimate

see also:

http://www.thewaterchannel.tv/thewaterblog/349-it-is-the-microclimate-you-didn-t-see

keen to get more material on this topic