A 249-year chronosequence of forest plots from eight successive fires in the eastern Canada boreal mixedwoods

A combination of wildfires and defoliating insect outbreaks play an important role in the natural successional dynamics of North American boreal forests, which, in the long term, change the post-disturbance composition and structure of forest stands. After stand-replacing disturbances (mainly wildfires), early successional hardwoods typically dominate the affected areas in boreal forests. Provided sufficient time following disturbances, the increasing recruitment of mid- to late-successional softwoods as well as the mortality of hardwoods gradually change forest composition from hardwoods to admixtures of hardwood-conifer species and conifer-dominated stands in mid and late successional stages, respectively. Such mixed woods are abundant across the southern Canadian boreal forest. In boreal Canada, mixed woods are the most structurally heterogeneous forest ecosystems, are highly productive, and form an important source of timber supply. Here we present the EASTERN BOREAL MIXEDWOODS CANA...

野火与食叶昆虫大暴发（defoliating insect outbreaks）的协同作用，对北美北方针叶林（North American boreal forests）的自然演替动态具有重要调控作用，从长期来看将改变林分（forest stands）受扰后的组成与结构。在林分更替型干扰（stand-replacing disturbances，主要为野火）发生后，北方针叶林的受扰区域通常会被早期演替阔叶树种（hardwoods）占据。若干扰后具备充足的恢复时间，中晚期演替针叶软木（softwoods）的更新量逐步提升，同时阔叶树种不断死亡，森林组成会逐步发生转变：演替中期以阔叶-针叶混交林为主，演替晚期则以针叶纯林为主。此类混交林（mixed woods）在加拿大南部北方针叶林区分布广泛。在加拿大北方针叶林区域内，混交林是结构异质性最高的森林生态系统，兼具极高的生产力，同时也是重要的木材供应来源。在此我们将呈现加拿大东部寒带混交林（EASTERN BOREAL MIXEDWOODS）相关数据集（原文未完整收尾）。