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| DOI：10.13522/j.cnki.ggps.2017.0652 |
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| Effects of Different Fertilizations on Organic Carbon Activity Following Remediation of a Coal Tailing |
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GAO Jiwei, XIE Yinghe, LI Tingliang, JIAO Huan, LI Yan, HE Bing, LI Shun
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College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China; .National Demonstration Center for Agricultural Resources and Environment Experimental Teaching, Shanxi Agricultural University, Taigu 030801, China
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| Abstract: |
| 【Objective】 Improving soil fertility is an effective way to remediate mining tailings and the purpose of this work is to investigate the change in organic carbon activity in a coal tailing following its remediation by different fertilization methods. 【Method】 Field experiment was conducted on a long-term experimental site to examine the effects of different fertilizations on change in activity of four organic carbons: water soluble organic carbon (WSOC), soluble organic carbon (DSOC), easy-oxidized organic carbon (ROOC) and light fraction organic carbon (LSOC), following remediation of the coal tailing formed due to collapse of a coal mining in Xiangyuan of Shanxi Province. We considered four fertilizations: single fertilizer application (CF), single organic manure application (M), combination of fertilizer and organic manure (MCF); the control was no fertilization. The carbon activity was measured between one to seven years after the remediation. 【Result】 The contents of the active organic carbons increased significantly as time elapsed in the order DSOC>LSOC>ROOC>WSOC. Seven years after the remediation, the content of water soluble organic carbon, soluble organic carbon, easily-oxidized organic carbon and light fraction organic carbon was 20%~100%, 10.31%~68.29%, 60%~186.83% and 15.29%~ 141.28% respectively, higher than those measured one year after the remediation. Among all treatments, a single manure application was most efficient, improving, the content of WSOC, DSOC, ROOC and LSOC by 8.33%~166.67%, 19.78%~48.74%, 23.7%~121.76% and 38.24%~189.29%, respectively, compared to the CK. The four active organic carbons were correlated, with a correlation coefficient for ROOC and LSOC, and ROOC and DSOC being 0.952 4 and 0.901 8, respectively. 【Conclusion】 When remediating coal tailing by removing the topsoil, an single manure application was most efficient to enhance organic carbon activity and improve nutrients cycling compared with other fertilizations if the amount of nutrients applied to the tailing was the same. |
| Key words: reclaimed soil; water-soluble organic carbon; soluble organic carbon; easily oxidized organic carbon; light fraction organic carbon |
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