森林生态效益外部性具有数量庞大、时空转移性、持续复杂性等特征。

The forest ecosystem externalities feature large volume, space-time transfer, continuance and complexity.

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必须对森林资源的生态效益实施国家定向合同购买或代理（社会）合同购买的办法来校正林业生产的外部性。

For the sake of ecological benefit of forestry resources, the external economy of forestry production must be adjusted by adopting state-oriented contract or agent-oriented contract system.

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