There is something wrong in my nutrient study!
I shouldn't distinguish the characters of protection zones. For example, each protection zone has it own primary purpose, such as conservation, recreation, or agriculture; also, each one has it own managing unit, such as state, municipal, or private. I should compare the protection zone with different "management measures", like private conservation vs. private agriculture, rather than private vs. state government, or agriculture vs. recreation.
I need to think about it!
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