degree of humification

例句：

1. 1. The process of humification is crucial for the soil's health.
   这个过程对土壤的健康至关重要。
2. 2. The humification of organic matter in the soil plays a vital role in nutrient cycling.
   土壤中有机物质的氧化作用在养分循环中起着关键作用。
3. 3. The humification of carbon dioxide into carbonic acid is a natural process in the atmosphere.
   二氧化碳转化为碳酸是大气中的一个自然过程。