...fication；community structure：biodiversity；artificial forest of Pinus yunnanensis 云南松林（Pinus yunnanensis forest）是云南省 最主要森林植被类型之一，云南松人工林面积达 11．325万hmZ［a］。
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流域内云南松林下也很常见。
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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