典型草原优势植物根际细菌群落多样性和功能群组成对长期放牧的响应机制

崔冬晴, 田晨, 宋慧敏, 鲁小名, 萨其日, 徐国庆, 杨培志, 白永飞, 田建卿

Response mechanisms of rhizosphere bacterial community diversity and functional group composition of dominant plants in typical grasslands to long-term grazing

CUI Dong-Qing, TIAN Chen, SONG Hui-Min, LU Xiao-Ming, SA Qi-Ri, XU Guo-Qing, YANG Pei-Zhi, BAI Yong-Fei, TIAN Jian-Qing

图4 不同放牧强度下大针茅(A、C)和糙隐子草(B、D)根际富集细菌属与植物功能性状的冗余分析(RDA)结果及相关性热图。*, p < 0.05; **, p < 0.01; ***, p < 0.001。AGB, 地上生物量; SLA, 比叶面积; ACNR, 地上生物量碳氮比; SRL, 比根长; ARD, 根平均直径; RTD, 根组织密度; RCNR, 根碳氮比。Actinoplanes, 游动放线菌属; Asanoa, 浅野氏菌属; Bacillus, 芽孢杆菌属; Bryobacter, 苔藓杆菌属; Candidatus Udaeobacter, 候选乌达杆菌属; Conexibacter, 连接杆菌属; Crossiella, 克罗斯氏菌属; Gaiella, 盖氏菌属; Gemmatimonas, 芽单胞菌属; Lechevalieria, 莱氏菌属; Micromonospora, 小单孢菌属; Nitrospira, 硝化螺旋菌属; Nocardioides, 类诺卡氏菌属; RB41, RB41菌属(未正式命名); Rhizobacter, 根瘤杆菌属; Rubrobacter, 红色杆菌属; Solirubrobacter, 土壤红色杆菌属; Sphingomonas, 鞘氨醇单胞菌属。

Fig. 4 Redundancy analysis (RDA) results and correlation heatmaps of rhizosphere enriched bacterial genera with plant functional traits of Stipa grandis (A, C) and Cleistogenes squarrosa (B, D) under different grazing intensities. *, p < 0.05; **, p < 0.01; ***, p < 0.001。AGB, aboveground biomass; SLA, specific leaf area; ACNR, aboveground biomass carbon to nitrogen ratio; SRL, specific root length; ARD, average root diameter; RTD, root tissue density; RCNR, root carbon to nitrogen ratio.