Effects of mulching and flooding on soil nutrients and bacterial community structure under Phyllostachys praecox

作者：Jianshuang Gao, Chaofeng Yang, Shunyao Zhuang, Renyi Gui · 发表于：Frontiers in Forests and Global Change · 年份：2024 · DOI：10.3389/ffgc.2024.1411297 · 被引用次数：11 · 研究领域：Plant responses to water stress、Soil Carbon and Nitrogen Dynamics、Agronomic Practices and Intercropping Systems

Phyllostachys praecox is a shallow-rooted bamboo that often encounters hypoxia conditions which could be induced by long-term organic material mulching or flooding. It is important to uncover the effect of mulching and flooding on soil nutrient, ammonia-oxidizing microbes, and bacterial diversity. We set up field pot experiments with three treatments (control, mulching, and flooding) under P. praecox . Mulching or flooding altered soil conditions significantly, and both increased ammonium-nitrogen (NH 4 + -N), total phosphorus (TP), available P (AP), and available potassium (AK) concentrations, and decreased oxygen (O 2 ) concentrations over control. Flooding increased pH and decreased nitrate-nitrogen (NO 3 − -N), while mulching decreased soil pH and NO 3 − -N. As O 2 content decreased, archaeal 16S rRNA, amoA gene copies of ammonia-oxidizing archaea (AOA) and ammonia oxidizing bacteria (AOB) increased. Mulching and flooding decreased Shannon, ACE and Chao 1 diversity when compared with the control, and as the O 2 contents decreased, bacterial diversity decreased. Redundancy Analysis revealed O 2 , NO 3 − -N, AK, AP, and pH were the major factors driving bacterial community structure. Correlation Analysis showed AK and O 2 contents were highly correlated with bacterial community structure. In addition, structural equation modeling indicated that O 2 facilitated efficient soil N use mainly through soil pH, AK content, and bacterial diversity. Mulching or flooding exerted grea...