Red Baron Farms
Philosopher
That's actually a perfect example of a place where reductionism fails and holism is needed. Taking a narrow reductionist view what you just wrote is true mostly. And an expert in crusts will be happy to show research and evidence of that. The part where it fails is in claiming there is no possible alternative or that the biosystem automatically dies. Better stated is that it will change. That change could be positive or negative depending on a whole host of variables including fields of science that the person studying crusts would not be aware of.When rainfall is measured in ones of inches per year, there is no useful retention near the surface possible, which is why desert plants are so spread out, with very wide (or very deep) root systems, with water retention biological processes, and why crust is so important. Destroy or disrupt that crust, and the biosystem dies. Grazing has a tendency to do just that.
Crusts do provide some armor to the surface. But there are other ways more beneficial to the ecosystem, like having the water locked in living organisms. A cell wall of a biological life form will lock a significant amount of moisture. If that organism is near the surface, then the net effect is that moisture is also near the surface. The capacity of dry land to hold water near the surface then is largely dependent on the living biomass found there. So making a blanket statement like that, as if crusts are the only possible way to protect the land, is actually false. The armor can be in living organism. It can also be in protective mulch and biomass undergoing biological decay. It is true the land does need a protective cover or the biosystem dies, but that cover doesn't always have to be the crust.
A crust is very limited in the biology it can support. Other types of protective layers that are carbon based can support much more. The reason for this is that humus can hold the equivalent of 80–90% of its weight in moisture, and therefore increases the soil's capacity to withstand drought conditions. Also the living biology that evolved in desert has developed ways to hold water and withstand drought conditions as well. Combine the two and instead of being additive they have a multiplying effect, because it is that biology that creates the humus. The process of biological decay that makes the humus cycles nutrients that feed the biology, creating more biomass. That is also why it all ties back to climate science. Because that increased biomass is carbon based and humus is carbon based, and CO2 in the atmosphere is a primary driver of AGW. Photosynthesis is a way to remove it from the atmosphere. But it will oxidize and return to the atmosphere unless it is somehow locked in the soil and the biology living in the soil.
It may sound circular, because it is. It is cyclical in nature. Grazing incorrectly will increase the oxidation side of the cycle, grazing correctly will increase the sequestration side. It is all about timing. Break the crust at the wrong time and it is harmful, creating sand dunes and dust storms and oxidizing any carbon that was present. Break it and replace it with a biological armor instead, and it is healing.
People want evidence. OK here is evidence from the Karoo region of South Africa. Single digit annual rainfall, desert conditions. Side by side comparison.
HM in Karoo
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