Competition among trees includes aboveground and underground parts.
树木间竞争包括地上和地下部分。
They also look at issues like operations to clear forests, and increasing competition among trees.
他们也检查了砍伐森林和正在增长的树林之间相互竞争等问题。
This has to be done to enhance widening of the tree stems and to reduce competition for light among the trees.
这是许多工作要做，以加强扩大树茎，以减少竞争，轻之间的树木。
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