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| Characteristic differences of selenium in the rhizospheric and non-rhizospheric soils of tea plantations, and its influencing factors |
| Received:December 01, 2017 |
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| KeyWord:rhizosphere effect;selenium;active aluminum;tea plantation soil |
| Author Name | Affiliation | E-mail | | SHI Yan-fu | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | ZONG Liang-gang | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | zonglg@njau.edu.cn | | ZHANG Yan-ping | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | SHEN Bi-yunzhu | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | YANG Yu-han | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | |
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| Abstract: |
| The "rhizosphere effect" of plants has been widely understood. However, there are few studies on the characteristics of selenium in the rhizosphere and the bulk soil of tea gardens, where the soils are acidic, selenium-enriched, and aluminum-enriched. In this study, the content and availability of selenium in the rhizosphere and the bulk soil from tea plantations, together with the chemical properties of the soil, were investigated. The contents of total selenium, available selenium, and the activation rate of selenium were higher in the rhizospheric soil, than in the bulk soil. The enrichment and activation of selenium occurred in the rhizospheric soil. The total selenium in the rhizospheric soil was related to that of the non-rhizospheric soil. The organic matter of non-rhizospheric soils could fix soil selenium, the primary source of rhizospheric selenium. The available selenium in rhizospheric soils had a significant positive correlation with the total selenium (P<0.01), with a correlation coefficient of 0.938. The pH, total phosphorus, and available phosphorus had little effects on the activation of rhizospheric selenium. The decrease in soil pH could reduce the available selenium in the rhizospheric soil. In addition, the exchangeable aluminum (Ex-Al) was negatively correlated to the total and available selenium in rhizospheric soils, with correlation coefficients of -0.646 and -0.659, respectively. Our results can provide strategies for the production of selenium-enriched tea. |
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