Fig. 4 Environmental
factors and land-use types shaping
microbial community composition in the river ecosystems during (a)
autumn and (b) spring. Pairwise comparisons of environmental factors and
land-use types are shown at the upper-right, with a color gradient
representing Spearman’s correlation coefficients. Microbial community
composition was correlated to each environmental factor or land-use type
based on the partial Mantel’s test. The line width represents the
partial Mantel’s r statistic for the corresponding correlation,
and the line color represents the significance based on 999
permutations. T, water temperature; Turb, water turbidity; Cond,
electrical conductivity; DO, dissolved
oxygen; TP, total phosphorus; TN,
total nitrogen; NH4+-N, ammonium
nitrogen; NO3--N, nitrate nitrogen;
NO2--N, nitrate nitrogen.