Fig. 8From: Root-associated endophytic bacterial community composition and structure of three medicinal licorices and their changes with the growing yearHeat maps of Spearman correlation analysis. Description: Ordinate is the information of environmental factors, and abscissa is the information of species at the genera level of taxonomy. The correlation coefficient r of Spearman is between − 1 and 1, r < 0 is negative correlation, r > 0 is positive correlation, and the mark * is significance test p < 0.05.Back to article page