云南松林区发生的森林火灾是多种自然因素和人为活动综合作用的结果。
The forest fires in Yunnan pine forest areas resulted from many kinds of natural factors and human activities.
本文还给出了各云南松林区可以用来根据自己的具体情况计算出适合自己的经济阈值的公式。
The paper also gives formulae for different Yunnan pine forest areas to calculate their own economic threshold according to their special situations.
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