As a non-native English speaker, I am having a hard time understanding what the author means by sensorily austere here. The quote is taken from Man in the landscape, by Paul Shepard.
The desert is the environment of revelation, genetically and physiologically alien, sensorily austere, esthetically abstract, historically inimical. [...]
I haven't found a dictionary that lists this word, but possible variations such as sensory.
Could anyone give me an easily understandable definition for that context?
(Is this perhaps an old-English word?)