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题目材料：
Livestock-grazing programs in arid zones that are based on the equilibrium view of rangelands-that grazing-induced land degradation will occur if livestock numbers exceed the availability of food-have failed. Contrary to the equilibrium view, traditional pastoral systems of land use are more appropriate. Such systems involve a high degree of opportunism to cope with unpredictable rainfall and fluctuating food distribution. Livestock mobility relieves areas of concentration and allows herds to exploit unevenly distributed resources. A strategy of managing multiple livestock species allows optimal use of these variable grazing resources. These approaches to land use are similar to those recommended by nonequilibrium models, which assume that plant dynamics in arid zones are influenced more by rainfall than by grazing.
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以上解析由 考满分老师提供。
