Hu Yunlong, Fu Liangchen, Ao Gukailin, Ji Chengjun, Zeng Hui, Zhu Biao
Institute of Ecology and Ministry of Education Key Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen, Guangdong 518055, China.
Sci Total Environ. 2025 Jan 1;958:178133. doi: 10.1016/j.scitotenv.2024.178133. Epub 2024 Dec 17.
Soil organic carbon (SOC) plays a critical role in mitigating climate change. Conceptualizing SOC into particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) helps us more accurately predict the responses of organic carbon, with varying chemical composition, molecular size, and degree of association with soil minerals, to environmental changes. To assess the controlling factors of particulate organic carbon (POC) and mineral-associated organic carbon (MAOC), plant and soil samples were collected from 54 temperate grassland sites in Northern China, and the impacts of climate, plants, soil properties and microorganisms on POC and MAOC contents were analyzed. The results indicated that POC slightly dominated temperate grassland topsoils. Climate, plants, and microorganisms could predict a significant portion of the variation in POC and MAOC contents. Microbial factors, represented by fungal and bacterial biomass and necromass carbon, explained 56.6 % and 46.7 % of the variation in POC and MAOC contents, respectively. These findings indicate that the potential of POC in soil carbon storage cannot be ignored, and microorganisms should be considered when studying the dynamics and accumulation of POC and MAOC.
土壤有机碳（SOC）在缓解气候变化方面发挥着关键作用。将土壤有机碳概念化为颗粒有机碳（POC）和矿物结合有机碳（MAOC），有助于我们更准确地预测具有不同化学成分、分子大小以及与土壤矿物结合程度的有机碳对环境变化的响应。为了评估颗粒有机碳（POC）和矿物结合有机碳（MAOC）的控制因素，从中国北方54个温带草原站点采集了植物和土壤样本，并分析了气候、植物、土壤性质和微生物对POC和MAOC含量的影响。结果表明，POC在温带草原表层土壤中占比略高。气候、植物和微生物能够预测POC和MAOC含量变化的很大一部分。以真菌和细菌生物量以及坏死物质碳为代表的微生物因素，分别解释了POC和MAOC含量变化的56.6%和46.7%。这些发现表明，POC在土壤碳储存中的潜力不可忽视，在研究POC和MAOC的动态变化和积累时应考虑微生物因素。
