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| Distribution of Total Fluoride and Water-soluble Fluoride in Soil Aggregates Under Tea Plantation of Different Years |
| Received:March 16, 2015 |
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| KeyWord:soil aggregates;tea plantation year;total fluoride;water-soluble fluoride |
| Author Name | Affiliation | E-mail | | YIN Jia-li | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | | | ZHENG Zi-cheng | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | zichengzheng@aliyun.com | | LI Ting-xuan | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| Soil fluoride status directly influences the tea quality. In order to understand the effects of tea-planting years on total fluoride and water-soluble fluoride content in soil aggregates, soil samples collected from tea plantation with four different years(16, 23, 31 years and 53 years) were examined. Results showed:The content of total fluoride and water-soluble fluoride increased with decreasing sizes of soil aggregates, and distributed mainly in <0.25 mm aggregate, which were 444.40~566.98 mg·kg-1 and 0.80~1.22 mg·kg-1, respectively. The content of total fluoride and water-soluble fluoride in soil aggregates of all sizes increased significantly over planting years, with higher in 0~20 cm than in 20~40 cm soil. The contributions of total fluoride and water-soluble fluoride in >5 mm soil aggregates to the whole soil were 48%~73% and 46%~70%, respectively, and they displayed a inverse “V” pattern over planting years, with the greatest contribution rates(68%~73%) found in the 23rd years. The opposite patterns appeared in the other soil aggregates. The total and water-soluble fluoride were significantly different among different soil aggregates, and accumulated in surface soil as plantation year increased. In addition, <5 mm aggregates played an obvious role in the accumulation of total fluoride and water-soluble fluoride in soils with more than 23 years of plantation. Therefore, attentions may be paid to the content of water-soluble fluoride in the 0~20 cm soil layer when the tea plantation is more than 23 years in order to reduce the risk of high fluoride tea. |
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