Background

Tea (Camellia sinensis L) has efficient aluminum (Al) accumulation mechanisms, Al accumulation in different tea varieties is affected by the distribution of Al fractions in soil. However, little is known about the changes in Al fractions based on the aggregates in soils of different tea varieties.

Methods

The distribution of Al fractions in aggregates collected from soils planted with four tea varieties (C. sinensis ‘Fuding Dabaicha’ (FD), Chuancha No. 3 (CC3), Chuanmu No. 217 (CM217) and Chuannong Huangyazao (CN)) was investigated by continuous extraction method.

Results

Results showed significant differences in the distributions of Al fractions among the soils. The FD soil had the highest organic matter-bound Al (Or-Al) concentration, which was related to its high proportion of > 5 mm aggregates and the high Or-Al concentration in the > 5 mm aggregates. The CC3 soil had the highest concentrations of total aluminum (T-Al), water-soluble aluminum (Ws-Al) and exchangeable aluminum (Ex-Al), and the accumulation of T-Al, Ws-Al and Ex-Al depended on the highest concentrations of T-Al, Ws-Al and Ex-Al in the > 5 mm and < 0.25 mm aggregates among the four soils. Therefore, these differences in the Al fraction distributions among the soils were related to the changes in soil aggregate compositions and the aggregate-associated Al fractions.

Conclusions

This study helps elucidate the mechanisms of Al sequestration, and provides evidence for developing appropriate management plans to prevent an increase in Al concentrations in the soils of CC3 and FD by adjusting the soil aggregate composition and the Al concentration of aggregates.

中文翻译：

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与不同茶（Camellia sinensis L.）品种相关的土壤中铝组分的变化：总体规模的见解

背景

茶叶（Camellia sinensis L）具有高效的铝（Al）积累机制，不同茶叶品种的铝积累受土壤中铝组分分布的影响。然而，关于不同茶品种土壤中铝含量的变化知之甚少。

方法

从种植 4 个茶品种（ C. sinensis '福鼎大白茶' (FD)、川茶 3 号(CC3)、川木 217 号(CM217) 和川农黄芽早(CN)）的土壤中采集的聚集体中铝组分的分布为采用连续萃取法进行研究。

结果

结果表明，土壤中铝组分的分布存在显着差异。FD土壤的有机质结合Al（Or-Al）浓度最高，这与其> 5 mm团聚体的比例高和> 5 mm团聚体中Or-Al浓度高有关。CC3土壤中总铝（T-Al）、水溶性铝（Ws-Al）和交换性铝（Ex-Al）的浓度最高，T-Al、Ws-Al和Ex-Al的积累取决于四种土壤中 > 5 mm 和 < 0.25 mm 聚集体中 T-Al、Ws-Al 和 Ex-Al 的最高浓度。因此，土壤中铝组分分布的这些差异与土壤团聚体组成和与团聚体相关的铝组分的变化有关。

结论

本研究有助于阐明铝封存的机制，并为制定适当的管理计划提供证据，通过调整土壤团聚体组成和聚集体的铝浓度来防止 CC3 和 FD 土壤中铝浓度的增加。