To reveal the effect of different planting years on rhizosphere microecosystem of Zanthoxylum bungeanum， the changes of microbial community structure， physiochemical properties and enzyme activities were studied， and the phospholipid fatty acid（PLFAs） contents of microorganisms， pH， total organic carbon（TOC）， available potassium， polyphenol oxidase activity， et al. were investigated in the rhizosphere soils of 1， 15 and 30-year-old Z. bungeanum trees. The results showed that the soil pH and the activity of polyphenol oxidase decreased with the increase of planting years， and the soil available K and P increased significantly at 15 and 30 a. The contents of total PLFA， fungi and gram-negative bacteria（G-） in soil increased with planting years， and reached the maximum at 30 years， which were 401.95， 88.14 and 118.61 μg·g-1， respectively. The contents of gram-positive bacteria（G+） and actinomycetes PLFA increased first and then decreased with planting years. Bacteria/fungi and G+/G- decreased with the increase of planting years. Compared with 1 year plants， bacteria/fungi and G+/G- decreased by 34.14% and 38.87% at 30 years plants respectively. Soil pH was significantly negatively correlated with total PLFA， G-， bacteria and fungi， and positively correlated with G+/G- respectively. The activity of polyphenol oxidase was significantly negatively correlated with fungi， and positively correlated with bacteria/fungi and G+/G- respectively. Z. bungeanum rhizosphere soil physiochemical properties， enzyme activities and microbial community structure changed significantly with the increase of plant years. The changes of rhizosphere soil pH， available phosphorus， available potassium， polyphenol oxidase activity were the main environmental factors that affected the microbial community and composition， the increase of fungi and G- and the decrease of polyphenol oxidase activity might be the important reasons that induced root rot of Z. bungeanum.
%U https://bbr.nefu.edu.cn/EN/10.7525/j.issn.1673-5102.2022.03.016