中国农业大学学报2024，Vol.29Issue(2)：36-46,11.DOI:10.11841/j.issn.1007-4333.2024.02.04
不同海拔高寒森林凋落物分解过程中土壤微生物群落的变化
Changes of soil microbial communities during litter decomposition in alpine forests at different elevations
摘要
Abstract
In order to explore the changes of soil microbial community structure in the process of litter decomposition in alpine forest and reveal the effects of elevation on soil microbial community and litter decomposition,this study conducted a one-year litter burial experiment at an elevation gradient of 3 500-4 300 m in Mount Segrila,Tibet,and analyzed the changes of microbial community structure and the degradation rules of litter at different elevations.The response relationship between soil physicochemical properties,microbial community structure and litter decomposition was elucidated.The results showed that the composition of soil bacterial community was relatively stable at different elevations,and the abundance of dominant bacterial phyla was significantly affected by total nitrogen and carbon nitrogen ratio(P＜0.05).Soil moisture and carbon nitrogen ratio significantly affected the changes of dominant fungi(P＜0.05).Theα-diversity indices of bacterial and fungal communities were significantly affected by elevation,litter degradation and their interactions(P＜0.001).The soil microbial community structure at high elevation(4 100 and 4 300 m)and low elevation(3 500,3 700 and 3 900 m)was similar,but the complexity of bacterial and fungal symbiotic network at different elevations was significantly different.After one year of burial,the degradation rate of litters at different elevations ranged from 28.2％to 45.2％,and there was a significant negative correlation between carbon nitrogen ratio and degradation rate of litters(P＜0.05).In conclusion,the elevation,carbon nitrogen ratio and soil moisture all had direct or indirect effects on the succession of bacterial and fungal communities and the degradation rate of litters,and the fungal community contributed more to the degradation of litters than the bacterial community.This study can provide scientific basis for the changes of microbial community structure and litter degradation at different elevations in the alpine forest of Mount Segrila.关键词
海拔/细菌/真菌/凋落物/降解率Key words
elevation/bacteria/fungi/litter/degradation rate分类
生物科学引用本文复制引用
侯卓男,张新军,王瑞红,李傲,李欣彤,魏雨泉..不同海拔高寒森林凋落物分解过程中土壤微生物群落的变化[J].中国农业大学学报,2024,29(2):36-46,11.基金项目
西藏高原森林生态教育部重点实验室开放课题(XZA-JYBSYS-2020-02) （XZA-JYBSYS-2020-02）
西藏自治区科技创新基地自主研究项目(XZ2022JR0007G) （XZ2022JR0007G）
