Soil organic matter (SOM) is a recognized carbon reservoir and paramount in soil functioning and agrosystems productivity. Different management strategies have been established to enhance SOM in arable soils, and one is the application of exogenous organic matter (EOM). Despite significant efforts in recent years, the consequences of EOM addition on increasing soil organic C (SOC) storage and stability in different pedoclimatic contexts remain incompletely understood. In this study, we evaluated the effect of long-term (28 y) sewage sludge (SS) addition to a calcareous soil supporting rainfed extensive crops in a Mediterranean sub-humid area in terms of SOC stabilization and distribution among functional fractions.

中文翻译：

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钙质土壤中长期添加污水污泥对土壤有机碳组分和土壤功能的影响

土壤有机质（SOM）是公认的碳库，对土壤功能和农业系统生产力至关重要。人们已经制定了不同的管理策略来提高耕地土壤的有机质，其中之一是外源有机质（EOM）的应用。尽管近年来付出了巨大努力，但在不同土壤气候环境下添加 EOM 对增加土壤有机碳 (SOC) 储存和稳定性的影响仍不完全清楚。在这项研究中，我们评估了在地中海半湿润地区支持雨养粗放作物的钙质土壤中长期（28 年）添加污水污泥（SS）对 SOC 稳定性和功能组分分布的影响。