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| DOI： |
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| Influence of Irrigation with Dairy Effluent on Soil Dissolved Organic Carbon and Its Distribution of the Section in the Corn Field |
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LIU Shimeng, CHEN Xiuhua, MO Kang, WANG Han, QU Yongsheng, LIAO Linxian
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College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
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| Abstract: |
| Aiming to analyze the effect of livestocks waste water irrigation on soil total organic carbon, dissolved organic carbon and the proportion of them, lysimeter experiment was conducted including clear water irrigation and livestocks waste water irrigation with three irrigation amounts. The results showed that the contents of total organic carbon and dissolved organic carbon decreased with the increase of soil depth. Generally, the contents of the total organic carbon irrigated by livestocks waste water were higher than those under clear water irrigation, which showed that livestocks waste water irrigation would induce the increase of soil carbon content within a certain range, especially in upper soil. The proportion of dissolved organic carbon to the total organic carbon gradually increased with soil depth，as the decrement of soil total organic carbon increased with soil depth and decrement of soluble organic carbon decreased. Under the clear water irrigation, the content of total organic carbon in the surface soil was the highest when the irrigation amount was 640 m3/hm2 and the content of dissolved organic carbon was the highest when the irrigation amount was 760 m3/hm2; under the livestocks waste water irrigation, both total organic carbon and dissolved organic carbon contents were the highest when the irrigation amount was 880 m3/hm2. Livestocks waste water irrigation is beneficial to the increase of the contents of soil total organic carbon and dissolved organic carbon and the accumulation of them in the upper soil. |
| Key words: livestocks waste water irrigation; soil total organic carbon; dissolved organic carbon |
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