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| Effect of biochar on the size and composition of soil-pool capacity(SPC)of copper in organic matter fraction |
| Received:July 30, 2018 |
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| KeyWord:organic matter;copper;composition;biochar |
| Author Name | Affiliation | E-mail | | WANG Yu-yang | Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570100, China | | | LUO Chun-yan | Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570100, China | | | WEI Zeng-hui | Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570100, China | | | ZHAO Qing-jie | Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570100, China | zqj20053@126.com | | WU Wei-dong | Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570100, China | |
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| Abstract: |
| To investigate the regulation capability of exogenous biochar on the size and composition of the soil-pool capacity for Cu in soil organic matter, representative soils from the tropical secondary rainforest and rubber plantations in Hainan Province were selected for further study. Per their soil organic carbon (OC) contents, we separated the soils into SoilL (low OC), SoilM (medium OC), and SoilH (high OC). Tested soils (SoilL and SoilM) were amended with corn-straw biochar (SoilL+B and SoilM+B). We spiked the soil samples with different levels of Cu (NO3)2, forming different Cu-contaminated treatments. Results showed that the saturation capacity of organic matterbound Cu was 8.70 mg·g-1 and 9.76 mg·g-1 in SoilL+B and SiolM+B, respectively, equivalent to 3.69 times and 3.12 times that of corresponding SoilL and SoilM. Compared to SoilL the saturation capacity of FA (fulvic acid) -Cu, HA (humic acid) -Cu, GRSP (glomalin-related soil protein) -Cu, and POM (particulate organic matter) -Cu in SoilL+B increased by 1.71, 2.83, 2.75 mg·g-1, and 0.09 mg·g-1, respectively. The saturation capacity of BC-Cu decreased by 0.76 mg·g-1 in SoilL+B. Compared to SoilM, the saturation capacity of FA-Cu, HA-Cu, GRSP-Cu, and POM-Cu in SoilM+B increased by 1.66, 3.75, 2.68 mg·g-1, and 0.07 mg·g-1, respectively, whereas the saturation capacity of BC-Cu reduced by 2.14 mg·g-1 in SoilM+B. The contribution rates of amended biochar to five organic-matter component-bound Cu pools in both SoilL and SoilM followed this order:HA > GRSP > FA > POM > BC. Thus, biochar significantly increases soil-pool capacity of Cu bound on organic matters and different organic-matter components in the soil. This is of great significance in improving the buffering capacity of soil for heavy metals. |
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