不同类型城市草地土壤可溶性有机碳的特征

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中图分类号：S812.2 文献标识码：A 文章编号：1007-0435（2026）04-1275-13

Abstract：To explore the influence of urban grassand types on soil DOC and its characteristics，this study took the urban green space ecosystem in Beijing as research object.Four treatments were established： bare land， cool-season grassland，warm-season grassand，and urban understory ground cover.The soil DOC content was measured，and the spectral characteristics of soil disolved organic matter （DOM） were analyzed by using ultraviolet-visible spectroscopy and three-dimensional fluorescence spectroscopy. The results showed that compared to the bare land，the DOC content of the cool-season grassland surface soil was significantly decreased by 30% （ ，but there was no significant difference from warm-season grassland and urban understory ground. The UV spectra showed there was no significant diference between the aromaticity and the hydrophobicity of the DOM among the treatments. The fluorescence spectra showed that the DOM of urban grasslands had mixed source characteristics. In compared with the bare land，the humization process of the urban grasslands was enhanced but self-source contribution was decreased，with strong microbial activity but weak bio-availability. The results showed that the dynamic of DOC in urban grassland was regulated by vegetation type，management measures and microbial activity.The optimization of fertilization management and the consideration of carbon sequestration type of grass species could enhance the function and stability of urban soil carbon sequestration，which provided theoretical support for the improvement of urban green space ecological function.

Key words： Urban lawn; Vegetation types;Dissolved organic carbon; UV-fluorescence absorption characteristic

土壤碳库是陆地生态系统中最大的碳库，碳储量约为大气碳库的3.3倍、生物碳库的4.5倍[1]。（剩余26961字）