It enforces selective logging not more than one tree every hectare.

它强制执行选择性砍伐每公顷只能砍一棵树。

Their two-year study found that even selective logging in protected forests opened up the canopy enough to dry out the undergrowth and make it catch fire more easily.

他们为期两年的研究发现，即使是在受保护的森林中有选择性的采伐，也足以打开树冠，使灌木丛变得干燥，更容易着火。