不同首蓿-粮食作物(饲草)轮作模式对土壤细菌群落组成及其生态功能影响

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中图分类号：S813.3 文献标识码：A 文章编号：1007-0435（2025）05-1387-11

Abstract：Inthis study，seven grass-grain（grass）crop rotation patterns were selected，and the effects of differ ent rotation patternsonsoil nutrient content and microbial diversity were investigated with the help of highthroughput sequencing technology. The results showed that compared with alfalfa continuous cropping mode， alfalfa-oats-alfalfa，alfalfa-corn-flaxand alfalfa-sorghum-millet models effctively increased the contentsof total phosphorus，available phosphorus，total potassium and available potassium insoil，and the bacterial community diversity index was the highest in alfalfa-sorghum-millt model.Proteobacteria，Acidobacteriota and Actinobacteriota were the dominant bacterial groups in soil bacterial communities under different cropping patterns.Further redundancy analysis revealed that organic carbon，total nitrogen and available nitrogen had more significant efects on soil bacterial community composition.The results of ecological function prediction showed thatMetabolism was the most important function of soil bacteria metabolism.Inconclusion，the bacterial community structure and ecological function of soil were changed after perennial alfalfa was turned into anual crop （forage）．Among them，alfalfa-sorghum-milet model had the best efect，and could be given priority in the improved rotation of saline-alkali land.

Key words： Alfalfa; Crop rotation;Soil bacterial community;Ecological function prediction

紫花苜蓿（MedicagosatiuaL.）作为目前栽培面积最大的豆科牧草，其丰富的营养价值和高产性使得它成为畜牧业的重要饲料来源，在草地农业生态系统中占据了举足轻重的地位，是粮草轮作种植模式的首选牧草1。（剩余15428字）