Decreased soil pH weakens the positive rhizosphere effect on denitrification capacity

文献类型： 外文期刊

第一作者： Wang, Jun

作者： Wang, Jun;Zhang, Zongxiang;Liang, Fei;Che, Zhao;Wen, Yongkang;Zhang, Manyu;Jin, Wenjun;Dong, Zhaorong;Song, He;Wang, Jun;Liang, Fei

作者机构：

关键词： bacterial abundance; denitrifier community; dissolved organic carbon; operational taxonomic unit; soil acidification

期刊名称：PEDOSPHERE （ 影响因子：7.3； 五年影响因子：6.2 ）

ISSN： 1002-0160

年卷期： 2024 年 34 卷 5 期

页码：

收录情况： SCI

摘要： The stimulating effect of rhizosphere on denitrification is considered to be an unavoidable loss of soil nitrogen (N) and detrimental to crop N use efficiency, which is regulated by crop growth and soil properties. Soil acidification, occurring rapidly in many intensive farming lands, affects both crop growth and soil properties, thereby altering rhizosphere effect on denitrification. However, the mechanism by which soil acidification regulates rhizosphere denitrification still remains unclear. Here, we determined the denitrification capacity (DC) and associated community compositions of nirK- and nirS-type denitrifiers in maize rhizosphere and bulk soils at four acidity gradients (pH = 6.8, 6.1, 5.2, and 4.2). Results showed that the stimulating effect of rhizosphere on DC strongly depended on soil pH. Compared to bulk soil, rhizosphere soil had significantly higher DC at pH >= 5.2, but not at pH of 4.2. With increasing soil acidity, the stimulation of rhizosphere on DC (calculated as the difference in DC between rhizosphere and bulk soils) decreased from 8.01 to 0.01 mg N kg(-1) d(-1). Moreover, soil acidification significantly reduced the differences in dissolved organic carbon (DOC) and abundance of key nirK-type denitrifier taxa between rhizosphere and bulk soils, both of which were positively related to the stimulation of rhizosphere on DC. These findings demonstrated that soil acidification could weaken the positive rhizosphere effect on denitrification via regulated C availability and associated nirK-type denitrifier community, potentially reducing N loss risk in rhizosphere soil. The independent role of soil pH should be fully considered when modelling N behaviour in plant-soil systems.

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