极端干旱区荒漠灌木叶际细菌群落多样性特征

尹翔正, 姜海燕, 张俊, 罗春生, 张元明

Diversity characteristics of phyllosphere bacterial communities in desert shrubs in hyper-arid regions

Xiangzheng Yin, Haiyan Jiang, Jun Zhang, Chunsheng Luo, Yuanming Zhang

图5 荒漠灌木叶际细菌群落的构建过程。(a)内生、附生细菌群落的β最近分类单元指数(βNTI)值, 虚线为阈值|2| (>|2|表示偏确定性过程,<|2|表示偏随机性过程); (b)基于零模型分析的确定性过程(同质选择和异质选择)与随机性过程(均质化扩散、扩散限制和生态漂变)对细菌群落构建的相对影响。缩写含义见图1。

Fig. 5 Assembly processes of phyllosphere bacterial communities in desert shrubs. (a) β-nearest taxon index (βNTI) distributions of endophytic and epiphytic bacterial communities. The dashed lines indicate the |2| threshold, with values>|2| suggesting deterministic assembly and values<|2| indicating stochastic dominance. (b) Relative contributions of deterministic (homogeneous and heterogeneous selection) versus stochastic (homogenizing dispersal, diffusion limitation, and ecological drift) processes to bacterial community assembly, inferred from a zero-model analysis. The meanings of the abbreviations are shown in Fig. 1.