Fig. 7
From: The diversity of hydrogen-producing bacteria and methanogens within an in situ coal seam
The RDA (redundancy analysis) based on the level of bacteria (a) and archaea (b) with the coal bed environmental factors and coal characteristics. The length of the impact factor is longer, the contribution of the impact is higher, and conversely, when the impact factor is shorter, the contribution of the impact is lighter. When the environmental factor is acutely angled with the sample, there is a positive correlation, and when the environmental factor and the sample angle are obtuse, there is a negative correlation