Acidification associated with plant phosphorus-acquisition strategies decreases nutrient cycling potential of rhizosphere bacteria along the Hailuogou post-glacial chronosequence

作者：Xiaolong Li, Hongyang Sun, Jun Zhou, Yang Chen, Hejun Du, Yue-Xin Ming, Shuang Wu, Hans Lambers · 发表于：Plant and Soil · 年份：2025 · DOI：10.1007/s11104-025-07445-z · 被引用次数：6 · 研究领域：Legume Nitrogen Fixing Symbiosis、Soil Carbon and Nitrogen Dynamics、Agronomic Practices and Intercropping Systems

Abstract Background and aim Soil nutrient availability, acidification associated with plant phosphorus-mining strategies, and fine root foraging all influence nutrient cycling. However, their relative impacts on microbial nutrient cycling during primary succession remain unclear. Methods We studied a 130-year primary succession along the Hailuogou post-glacial chronosequence in southwest China. Early-successional stages (1–3) are dominated by Hippophae tibetana , which is gradually replaced by Populus purdomii . In the climax community (stage 4), Abies fabri replaces P. purdomii . We collected rhizosphere soil, roots, and leaves from the dominant species, analyzing how phosphorus-acquisition strategies (proxied by soil pH, leaf manganese concentration and fine-root morphology) influenced bacterial nutrient-cycling gene abundance, based on 16S rRNA sequencing. Results Rhizosphere pH and the abundance of genes encoding enzymes involved in ammonium and nitrate assimilation, denitrification and phosphorus mobilization were significantly lower for H. tibetana and A. fabri than for P. purdomii . In contrast, P. purdomii exhibited a significantly higher specific root length. Linear mixed models reveal that leaf manganese concentration was positively correlated with soil acidification. Multiple regression models show that nutrient-cycling potential was more significantly linked to soil pH than to fine-root morphology or soil nutrient availability. Structural equation models indicate ...