AUTHOR=Wang Yuhua , Li Jianjuan , Li Mingzhe , Jia Xiaoli , Cai Yuhong , Hu Mingyue , Zhang Qingxu , Cheng Pengyuan , Lin Shaoxiong , Lin Wenxiong , Wang Haibin , Wu Zeyan 

TITLE=Effect of continuous planting on Casuarina equisetifolia rhizosphere soil physicochemical indexes, microbial functional diversity and metabolites

JOURNAL=Frontiers in Plant Science

VOLUME=14

YEAR=2023

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2023.1288444

DOI=10.3389/fpls.2023.1288444

ISSN=1664-462X

ABSTRACT=<p>Continuous planting has a severe impact on the growth of <italic>Casuarina equisetifolia</italic>. In this study, the effects of three different long-term monocultures (one, two and three replanting) on the physicochemical indexes, microbial functional diversity, and soil metabolomics were analyzed in <italic>C. equisetifolia</italic> rhizosphere soil. The results showed that rhizosphere soil organic matter content, cation exchange capacity, total and available nitrogen, total and available phosphorus, and total and available potassium contents significantly decreased with the increasing number of continuous plantings. The evaluation of microbial functional diversity revealed a reduction in the number of soil microorganisms that rely on carbohydrates for carbon sources and an increase in soil microorganisms that used phenolic acid, carboxylic acid, fatty acid, and amines as carbon sources. Soil metabolomics analysis showed a significant decrease in soil carbohydrate content and a significant accumulation of autotoxic acid, amine, and lipid in the <italic>C. equisetifolia</italic> rhizosphere soil. Consequently, the growth of <italic>C. equisetifolia</italic> could hinder total nutrient content and their availability. Thus, valuable insights for managing the cultivation of <italic>C. equisetifolia</italic> and soil remediation were provided.</p>