Effects of Orchard Grass Cultivation of Invasive Plant Ageratum conyzoides L.on Soil Nutrients and Bacterial Community in Orchard
[Objective]This study is aimed to investigate the effects of grass cultivation of invasive plant Ageratum conyzoides L.on soil nutrients and microbial community structure,with the objective of provid-ing a foundation for rational utilization of grass in orchards management.[Method]The primary focus was on the soil from a Citrus grandis var.sweet pomelo.garden covered with A.conyzoides L.(XHJ),while the soil covered with Trifolium repens L.(SYC)and those subjected to clean tillage(CK)served as the control.The effects of different grass cultivation treatments on soil pH,organic matter,total nitrogen,to-tal phosphorus,total potassium,available nitrogen,available phosphorus,available potassium and bac-terial community in C.grandis var.sweet pomelo orchard were studied,and their mechanisms were ana-lyzed.[Result]In HXJ,soil pH significantly increased to 5.56,indicating a weak acidity,while total phosphorus and available phosphorus contents decreased compared to CK.The soil bacterial community in HXJ showed significantly higher OTU numbers,unique OTU numbers,and Shannon,Chao 1,and ACE indices than CK.HXJ also improved soil microbial community structure abundance more effectively than SYC.Dominant bacterial phyla in the soil included Proteobacteria,Actinobacteriota,Acidobacteri-ota,Chloroflexi and other 4 bacteria,with a combined relative abundance of 89.99％-94.45％.The rela-tive abundances of Actinobacteriota and Chloroflexi were observed in the order of CK＞SYC＞HXJ,whereas Acidobacteriota exhibited the opposite trend.The results of principal coordinate analysis(PCoA)showed that the soil bacterial community composition of HXJ differed from CK and was more similar to SYC.Mantel test results showed that variations in the relative abundance of dominant bacteria across the three treatments were attributable to changes in soil nutrients.The primary driving factors iden-tified were soil pH,soil organic matter,total nitrogen,total phosphorus,total potassium,and available phosphorus.[Conclusion]A.conyzoides L.improved the diversity and abundance of soil bacterial com-munity and influenced its structure by elevating soil pH while reducing levels of total nitrogen,total phos-phorus,total potassium,and available phosphorus.Among these factors,the contents of total phospho-rus and available phosphorus exerted the most significant impact on the bacterial community structure.
万方数据
维普
