求翻译：森林作为陆地生态系统的主体，是地球生物圈的重要组成部分，占据了全球非冰层陆地表面的40%。与其他生态系统相比，森林生态系统分布面积最大，生物生产力和生物量积累最高，还具有丰富的物种组成和最复杂的层次结构，在地球生物圈的生物地球化学循环过程中起着重要的“缓冲器”和“阀”的作用是什么意思？

Forest as the main body of the terrestrial ecosystem, is an important part of the Earth's biosphere, accounted for 40% of the global non-ice land surface. Compared to other ecosystems, the distribution area of ​​the forest ecosystem, the highest biological productivity and biomass accumulation, spec

As a land-based ecosystems, and the body of the Earth's biosphere is important part of the global non-ice land surface of 40 per cent. Compared with other ecosystems, forest ecosystem distribution are the largest and biological productivity and biomass accumulation, also has a wealth of species comp

The forest took the land ecosystem the main body, is the Earth biosphere important constituent, occupied the global non-ice layer land surface 40%.Compares with other ecosystem, the forest ecosystem dispersal area is biggest, the biological productive forces and the biomass accumulate high, but also

Forests as subjects of terrestrial ecosystems, are important components of the biosphere of the Earth, accounted for global ice land surface of 40%. Compared with other ecological systems, distribution largest forest ecosystems, biological productivity and biomass accumulation at the highest, also h

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