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Effects of Different Fertilization Practices on Organic Carbon and Enzyme Activity in Soil of Continuous Cropping Celery
JINXuelan, HUShengyuan, SHILin, MAYaoyu, YANGTing, WUHongliang, KANGJianhong, FENGHaiping
Chin Agric Sci Bull ›› 2026, Vol. 42 ›› Issue (8) : 120-127.
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Abbreviation (ISO4): Chin Agric Sci Bull
Editor in chief: Yulong YIN
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Effects of Different Fertilization Practices on Organic Carbon and Enzyme Activity in Soil of Continuous Cropping Celery
To study the influence of fertilization measures on the variation of soil organic carbon and enzyme activity, and to provide theoretical basis for rational application of organic fertilizer to continuous cropping celery fields in the mountainous area of southern Ningxia, field trials were conducted from 2019 to 2024 in long-term continuous cropping celery fields in Xiji, Ningxia. The experiment was set up in a randomized block design with four fertilization modes: i.e., no fertilizer (CK), organic fertilizer (OF), biochar (BC), and biochar + organic fertilizer dosing (BF). By measuring soil organic carbon content, active organic carbon fractions, urease activity, and sucrase activity, this study investigated the effects of fertilization practices on changes of soil organic carbon and enzyme activity. The results showed that compared with CK, BF and OF were able to significantly increase the mass fraction of clusters with >1 mm size and the mean mass diameter (MWD) and geometric mean diameter (GMD) of the clusters. In >1mm and <0.25mm grain sizes, the soil organic carbon levels of BF treatment were higher than those of other treatments. In 0.25-1mm and <0.25mm grain sizes, the CPMI of OF treatment was significantly more than the other processing, which increased the CPMI by 2.39% and 21.15% compared with CK. BC treatment had the highest urease activity in all grain level agglomerates, with a significant improvement of 34.85%, 22.83% and 0.39% over CK, followed by OF treatment. The magnitude of soil sucrase activity in all grain level agglomerates showed that OF>CK>BC>BF, and OF increased by 10.51%, 10.59%, and 3.19% compared with CK. Correlation analysis results indicated that across all aggregate size fractions, soil urease activity exhibited a negative correlation with soil active organic carbon; sucrase activity showed a positive correlation with urease activity. And in the >1mm and 0.25-1mm agglomerates, the organic carbon was positively linked to soil activated organic carbon compositions, and significantly negatively linked to the activities of sucrase. In summary, the application of organic fertilizers can improve soil structure, enhance aggregate stability, increase the content of soil organic carbon (SOC) and active organic carbon components in particle size fractions >1 mm and <0.25 mm, elevate the level of soil carbon pools, increase the enzyme activity of the aggregates, and improve the quality of the soil carbon pool levels, and boost aggregate enzyme activity, thereby effectively improving soil quality of continuous cropping celery fields.
organic fertilizer / biochar / organic carbon / soil carbon pool management index / enzyme activity
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