English to Chinese Science Forestry / Wood / Timber

上下文讲的是森林：

Forests are classed by age only for management purposes. They can be undisturbed but few if any remain and, in North America, only the extreme northern boreal forests qualify as pristine; young or immature stands are called ‘second growth’ 【following】 disturbance even when old and mature; and truly old growth forests have long recovered from disturbance and are characterized by a mixture of healthy and diseased, decrepit or moribund stems

年轻的、未成熟的森林叫做“次生林”，接下来 following disturbance ... 好像是说老的和成熟的森林如果受过干扰，也叫次生林，可对？