我们呼吸的空气，饮用的水，生长食物的土壤，是全球脆弱生态系统的一部分，这一系统所承受的人类活动的压力日益加大。
The air we breathe, the water we drink and the soil that grows our food are part of a delicate global ecosystem that is increasingly under pressure from human activities.
对华北平原高产农田生态系统2004年的土壤呼吸状况进行了分析，探讨了不同耕作方式下土壤呼吸量的季节变化规律。
This study investigated variations in soil respiration under different cultivation practices on high yield farmland in the North China Plain during 2004.
尽管如此，土壤呼吸仍是一个为人们了解不多的生态系统过程。
However, soil respiration is still an ecosystem process that has been poorly understood.
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