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3 不同放牧强度下大针茅和糙隐子草根际细菌相对丰度增加属热图(A、B)和功能类群相对丰度线性回归图(C、D)。A、B中不同小写字母分别表示不同放牧强度对该属的相对丰度影响差异显著(p < 0.05)。CK、L、M和H分别代表对照、轻度放牧、中度放牧、重度放牧。RA表示4个放牧强度下该属的平均相对丰度。C、D中误差棒为平均值±标准误。*, p < 0.05; ***, p < 0.001; ns, p ≥ 0.05。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; Gaiella, 盖氏菌属; Crossiella, 克罗斯氏菌属; 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. 3 Heatmaps of rhizobacterial genera with increased relative abundance (A, B) and linear regression of functional group relative abundance (C, D) for Stipa grandis and Cleistogenes squarrosa under different grazing intensities. Different lowercase letters indicate significant differences (p < 0.05) in the relative abundance of genera influenced by varying grazing intensities in A and B. CK, L, M, and H represent control, light grazing, moderate grazing, and heavy grazing, respectively. RA denotes the average relative abundance of the genus under the four grazing intensities. Error bars in C and D represent mean ± SE. *, p < 0.05; ***, p < 0.001; ns, p ≥ 0.05.