Effect of chemical diversity of typical small molecule organic compounds in simulated root exudates on net nitrogen mineralization in paddy soil

doi:10.14088/j.cnki.issn0439-8114.2026.01.008

Abstract

Abstract: In order to explore the effects of the diversity and composition of small molecule organic compounds on soil net nitrogen mineralization, 52 simulated root exudate combinations were constructed using 9 main small molecule organic compounds in rice root exudates and added to paddy soil. Through a 15-day incubation experiment, it was found that the diversity and composition of organic compounds significantly affected the soil net nitrogen mineralization rate. In the optimal simplest linear model, the importance of glycine, acetic acid and compound diversity on net nitrogen mineralization ranked the top three. The effects of single carbon source components on net nitrogen mineralization in simulated secretions showed that acetic acid, malic acid, and pyruvate significantly inhibited net nitrogen mineralization, while glycine, aspartic acid, serine and alanine significantly promoted net nitrogen mineralization. This suggested that plants could regulate soil nitrogen cycling by secreting small molecular organic compounds.

Key words: root exudates, small molecule organic compound, chemical diversity, paddy soil, net nitrogen mineralization

CLC Number:

S154.2

YANG Ye, YU Yan-li, HUANG Si-yun. Effect of chemical diversity of typical small molecule organic compounds in simulated root exudates on net nitrogen mineralization in paddy soil[J]. HUBEI AGRICULTURAL SCIENCES, 2026, 65(1): 42-47.

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