Fig. 7From: Diagnosing bioremediation of crude oil-contaminated soil and related geochemical processes at the field scale through microbial community and functional genesPCA biplot analysis of samples and microorganisms (at the genus level). The green points represent the samples. The black rays with solid arrows represent the microorganism species. The red rays with open arrows represent the environmental factors, including the nitrogen and functional genesBack to article page