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| Influence of Exogenous Lanthanum on Soil Organic Carbon in Tea Soil |
| Received:June 12, 2015 |
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| KeyWord:rare earth elements;lanthanum;tea garden soil;soil organic carbon |
| Author Name | Affiliation | E-mail | | PANG Yu | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | | | HU Yu-fu | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | 66433119@qq.com | | SHU Xiang-yang | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | | | JIANG Shuang-long | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | | | JIANG Fan | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | | | FENG Hui-ling | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| Rare earth elements have shown beneficial roles in plant growth, yields and quality. However, there is little information available about their effects on soil organic carbon(SOC), an important indicator of soil fertility and soil ecological quality. In this study, a pot experiment was carried out to examine the effects of exogenous lanthanum(La) on SOC and its active components, including readily oxidizable organic carbon(ROC), water-soluble organic carbon(WSOC) and microbial biomass carbon(MBC), in tea garden soil. Lanthanum had significantly effects on SOC and its active components. SOC, ROC and WSOC displayed a promotion at low concentrations but an inhibition at high concentrations, while the inhibitory effect of La on MBC constantly increased with increasing La concentrations. Extending La exposure decreased SOC and MBC content, while it tended to increase ROC and WSOC content. These findings show that MBC can be used as a sensitive index to monitor and evaluate the influence of exogenous rare earth elements on soil organic carbon. |
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