俄罗斯森林大火产生的烟雾如此之重,与其森林的特点密不可分。俄罗斯森林具有典型的北方林(boreal forest)特征,即树种单一,多为针叶林,由于寒冷的气候而生长缓慢。
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落叶松人工林是我国北方林区主要用材林之一,对我国的国民经济建设起到重要作用。
Larch plantation is one of the main commercial forests in north China and has an important contribution to the national economy.
结合全球变化的预测结果,模拟了全球气候变化下中国北方林生物量、生产力以及碳吸收能力的变化;
Simulated the impacts of global climate change on the biomass, productivity, and carbon sink capacity of Chinese boreal forest based on the predicted results of global change.
北方森林中大约有三分之一位于加拿大境内,其面积约5.7亿公顷(14亿英亩),只有俄罗斯号称拥有更大面积的泰加针叶林。
About a third of the ring is in Canada, which has some 570 million hectares (1.4 billion acres) of boreal forest: only Russia boasts more.
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