原始次生林( secondary forest),是原始森林经过多次不合理采伐和严重破坏以后自然形成的森林,与原始林一起同属天然林。中国次生林约占全国森林面积的46.2%,约占全国森林总蓄积量的23.3%。次生林多为幼壮林,常以阔叶树种居优势,林相混杂,乔木、灌木混生,生长率较低,材质不良,利用价值受一定影响。
在影响原始次生林蜘蛛群落结构的诸因素中,人为干扰的影响作用最大。
Among the factors that affect the spider communities of original secondary forest, people's interference is the strongest one.
地图册上以深绿色表示原始丛林,以浅绿色表示次生林。 大部分地方的次生林是围绕着原始丛林的。
The maps show, in dark green, Indonesia’s virgin jungle and, in a lighter shade, the secondary forest which, in many places, surrounds it.
从蚂蚁群落相似性系数来看,4种植被亚型的原始林和次生林蚂蚁物种的组成均具有显著差异。
According to the Jaccard similarity coefficient, the composition of the ant species all has distinct difference between primeval and secondary forests of the 4 vegetation subtypes.
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