The amount of permitted soil losses was 60t/ ( km 2 · a) regarded as a limit of not being eroded obv

中文解释

通过10年观测，侵蚀模数与植被覆盖率的定量关系，石灰岩低山区土壤允许流失量60t/km2a作为无明显侵蚀的界限。

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