槟榔间作香露兜对土壤细菌群落结构和多样性的影响.

【Objective】 The present paper aimed to study the effects of Pandanus amaryllifolius Roxb. intercropping with Areca catechu L. on the structure and diversity of soil bacterial communities, to clarify the key environmental factors affecting soil bacterial community in the intercropping mode, so as to provide a theoretical basis for optimizing the betel nut intercropping mode and the development of tropical farmland economy. 【Method】 Through the method of field experiment, the experimental plots including A. catechu monocropping （control'), P. amaryllifolius monocropping （control） and P. amaryllifolius intercropping with A. catechu were established in Xinglong area to measure soil physical and chemical properties, nutrient content, soil bacterial abundance, and diversity to explore the effect of intercropping model on soil bacterial community structure and diversity. 【Result】 The results showed that the ACE index, Chao1 index and Shannon index of the bacterial community under the A. catechu intercropping P. amaryllifolius model were significantly reduced than control（P<0.05,the same as below）. In intercropping mode, pH, electrical conductivity, total phosphorus, and bulk density were the main environmental factors that affected the changes of soil bacterial communities. In the three planting modes, the dominant bacteria phyla of bacteria were Proteobacteria, Actin bacteria, Actin bacteria, and Chloroflexi. The relative abundance of Proteobacteria, Acid bacteria and Acidobacteria was decreased, and the relative abundance of Chloroflexi was increased. Among them, Acid bacteria was significantly positively correlated with soil bulk density; Chloroflexi was extremely significantly positively correlated with conductivity and organic matter （P<0.01,the same as below）, extremely significantly negatively correlated with total phosphorus, and significantly negatively correlated with total potassium. 【Conclusion】 P. amaryllifolius intercropping with A. catechu does not affect the total number of bacterial OTU, but significantly reduces the diversity index of soil bacterial community by reducing pH and increasing electrical conductivity. Intercropping mode reduces the contents of total phosphorus, total potassium and organic matter by increasing soil bulk density, while reducing the abundance of Proteobacteria, Actinomycetes and Acid bacteria, but increasing the abundance of Chloroflexi. It can be seen that although the betel nut intercropping system significantly reduces the content of soil nutrients, it can improve the abundance and diversity of in-situ soil bacterial flora of betel nut forest, which is of positive significance to maintain the soil health of betel nut forest and promote the development of related industries of betel nut and betel nut. [ABSTRACT FROM AUTHOR]