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Cities and urbanisation
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vtsnowedin



Joined: 07 Jan 2011
Posts: 4604
Location: New England ,Chelsea Vermont

PostPosted: Mon Mar 19, 2018 8:53 pm    Post subject: Reply with quote

woodburner wrote:
The deserts have been changing for as long as anyone can tell, and they will continue to change. The Arabian and African deserts did this as a naturral process, in the US the grasslands have been changed into deserts-in-waiting. Once the mono-culture crops fail, the land will be deserts.
If land has enough rainfall to support corn or soybeans (corn needs 25 inches a year) left fallow long enough it will revert to grassland or forest not desert. Typically farmers that give up on a field plant it to a grass mix that can be hayed or grazed before moving on. The only land that will turn to desert will be irrigated land that was desert to begin with. I have a field that I grew corn on twenty years ago that was thirteen feet high. It now has emergent tree species on it that are eight inches through and thirty feet high mixed in with blackberries that can scratch the eyes of a six foot man.
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