The priority in forest history studies was shifted from forest history in the temperate zone to forest history in tropical zone.

就国际森林史研究来看，经历了一个从重点研究温带森林史向热带森林史转变的过程。

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Mangroves, as a special forest, growing in tropical and subtropical zone, occupy mainly five functions as(1) Protect embankment, prompt the process of land formation;

红树林具有五个方面的作用：1．促进海滩沉积过程，造陆作用，保护堤坝；

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It is the largest continuous area of primary broad leaf forest ecosystem in the whole sub-tropical zone.

UNESCO: EDUCATION