Different degrees of soil compaction were caused by frequently human activities in urban forest in recent years, and thus affected forest productivity and soil carbon balance.
近年来城市森林人为活动频繁，对林地土壤造成不同程度的压实，从而影响林分生产力及森林土壤碳平衡。
Soil plays an important role in maintaining the balance of global carbon and nitrogen cycling.
土壤在维持全球碳、氮循环中起着重要的作用。
Soil organic carbon (SOC) is an important component of the global carbon cycle, and it has direct effects on the global carbon balance.
土壤有机碳（SOC）是全球碳循环的重要组成部分，它具有直接影响全球碳平衡。
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