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. 2016 Nov 16;7:1840. doi: 10.3389/fmicb.2016.01840

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Copyright © 2016 Zhu, Ling, Guo, Wang, Guo and Shen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Redundancy analysis of the identified ethyl acetate-extracted DOM. The different fertilizer treatments for individual samples. The three arrows represent three environment factors: M (+/-) represents treatments with (+) and without (-) organic manure; P (+/-) represents treatments with (+) and without (-) P fertilizer; N (+/-) represents treatments with (+) and without (-) N fertilizer. According to Monte Carlo permutation test the significances are: M (+/-): r² = 0.8608, P = 0.002; P (+/-): r² = 0.4612, P = 0.73; N (+/-): r² = 0.3676, P = 0.136. NK, soil treated with chemical N and K fertilizer; NPK, soil treated with chemical N, P, and K fertilizer; NPKM, soil treated with chemical fertilizer (N, P, and K) plus organic manure; and M, soil treated with only organic manure. The number (1, 2, and 3) following the treatment indicates replicates of each treatment.