不同首蓿-糧食作物(飼草)輪作模式對土壤細菌群落組成及其生態(tài)功能影響

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中圖分類號：S813.3 文獻標識碼：A 文章編號：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.）作為目前栽培面積最大的豆科牧草，其豐富的營養(yǎng)價值和高產(chǎn)性使得它成為畜牧業(yè)的重要飼料來源，在草地農(nóng)業(yè)生態(tài)系統(tǒng)中占據(jù)了舉足輕重的地位，是糧草輪作種植模式的首選牧草1。（剩余15428字）