由于养分的重要性和贫乏性，营养循环是我们在这门课中会讲到的最重要的生态系统过程之一。
Because of the importance of nutrients and their scarcity, nutrient recycling is one of the most significant eco-system processes that we'll cover in this course.
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.
土壤过程是陆地生态系统过程的重要组成部分，对全球变化有响应和反馈作用。
Soil process is one of the key processes of terrestrial ecosystem, which responds and feeds back to the global change.
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