森林是地球之肺，是陆地生态系统的主体。
Forest just like lung of the earth is main part of terrestrial ecosystem.
森林生态系统是地球上最大的陆地生态系统。
Forest ecosystem is the biggest land ecosystem in the world.
森林是人类赖以生存的主要陆地生态系统之一。
Forest is one of the main terrestrial ecosystems which human being lives on.
因而展开陆地生态系统内的碳循环研究意义重大。
Therefore, the research about carbon cycle of terrestrial eco-system is profound.
森林是陆地生态系统的主体，是国家的重要资源和资产。
Forest is the main body of earth ecosystem and the important national resource and assets.
森林是陆地生态系统的主体，是国家的重要资源和资产。
Forest is the main body of earth ecosystem and the important national resource and assets.
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